TROJ_DROPPR.GSF

October 04, 2014

ALIASES:

Trojan horse MSIL4.CDRJ (AVG)

PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes

OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

TECHNICAL DETAILS

File Size: 80,384 bytes

File Type: EXE

Memory Resident: Yes

Initial Samples Received Date: 17 Sep 2014

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system:

%Program Files%\Windows Services\wservice.exe
%System%\Microsoft.com
%User Profile%\My Documents\Google.com

It creates the following folders:

%Program Files%\Windows Services

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\svchost

Other System Modifications

This Trojan deletes the following files:

{malware path and file name}:zone.identifier

It adds the following registry keys:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
Microsoft\Sysinternals

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rstrui.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AvastSvc.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avconfig.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AvastUI.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avscan.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
instup.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbam.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbamgui.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbampt.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbamscheduler.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbamservice.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
hijackthis.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
spybotsd.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ccuac.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avcenter.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avguard.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgnt.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgui.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgcsrvx.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgidsagent.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgrsx.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgwdsvc.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
egui.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
zlclient.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
bdagent.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
keyscrambler.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avp.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
wireshark.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ComboFix.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
MSASCui.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
MpCmdRun.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
msseces.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
MsMpEng.exe

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\svchost
Description = "Microsoft svchost"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\svchost
DysplayName = "Svchost"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\svchost
ImagePath = "%User Profile%\Application Data\svchost.exe"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\svchost
Type = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\svchost
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\svchost
ErrorControl = "1"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
Microsoft\Sysinternals
3243 = "{malware path and file name}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
rstrui.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AvastSvc.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avconfig.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
AvastUI.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avscan.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
instup.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbam.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbamgui.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbampt.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbamscheduler.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
mbamservice.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
hijackthis.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
spybotsd.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ccuac.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avcenter.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avguard.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgnt.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgui.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgcsrvx.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgidsagent.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgrsx.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avgwdsvc.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
egui.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
zlclient.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
bdagent.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
keyscrambler.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
avp.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
wireshark.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
ComboFix.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
MSASCui.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
MpCmdRun.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
msseces.exe
Debugger = "%User Profile%\My Documents\Google.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
MsMpEng.exe
Debugger = "%User Profile%\My Documents\Google.com"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "0"

(Note: The default value data of the said registry entry is 2.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%System%\Microsoft.com"

Other Details

This Trojan connects to the following possibly malicious URL:

{BLOCKED}.0.89

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine: 9.700

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services
- svchost

In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\Microsoft
- Sysinternals

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- rstrui.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- AvastSvc.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avconfig.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- AvastUI.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avscan.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- instup.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- mbam.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- mbamgui.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- mbampt.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- mbamscheduler.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- mbamservice.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- hijackthis.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- spybotsd.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- ccuac.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avcenter.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avguard.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avgnt.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avgui.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avgcsrvx.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avgidsagent.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avgrsx.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avgwdsvc.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- egui.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- zlclient.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- bdagent.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- keyscrambler.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- avp.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- wireshark.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- ComboFix.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- MSASCui.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- MpCmdRun.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- msseces.exe

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options
- MsMpEng.exe

To delete the registry key this malware/grayware created:

Open Registry Editor.
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
» For Windows Vista, Windows 7, and Windows Server 2008 (R2) users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, and Windows Server 2012 (R2) users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter.
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services
Still in the left panel, locate and delete the key:
svchost
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>VB and VBA Program Settings>Microsoft
Still in the left panel, locate and delete the key:
Sysinternals
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options
Still in the left panel, locate and delete the key:
rstrui.exe
Again Still in the left panel, locate and delete the key:
AvastSvc.exe
Again Still in the left panel, locate and delete the key:
avconfig.exe
Again Still in the left panel, locate and delete the key:
AvastUI.exe
Again Still in the left panel, locate and delete the key:
avscan.exe
Again Still in the left panel, locate and delete the key:
instup.exe
Again Still in the left panel, locate and delete the key:
mbam.exe
Again Still in the left panel, locate and delete the key:
mbamgui.exe
Again Still in the left panel, locate and delete the key:
mbampt.exe
Again Still in the left panel, locate and delete the key:
mbamscheduler.exe
Again Still in the left panel, locate and delete the key:
mbamservice.exe
Again Still in the left panel, locate and delete the key:
hijackthis.exe
Again Still in the left panel, locate and delete the key:
spybotsd.exe
Again Still in the left panel, locate and delete the key:
ccuac.exe
Again Still in the left panel, locate and delete the key:
avcenter.exe
Again Still in the left panel, locate and delete the key:
avguard.exe
Again Still in the left panel, locate and delete the key:
avgnt.exe
Again Still in the left panel, locate and delete the key:
avgui.exe
Again Still in the left panel, locate and delete the key:
avgcsrvx.exe
Again Still in the left panel, locate and delete the key:
avgidsagent.exe
Again Still in the left panel, locate and delete the key:
avgrsx.exe
Again Still in the left panel, locate and delete the key:
avgwdsvc.exe
Again Still in the left panel, locate and delete the key:
egui.exe
Again Still in the left panel, locate and delete the key:
zlclient.exe
Again Still in the left panel, locate and delete the key:
bdagent.exe
Again Still in the left panel, locate and delete the key:
keyscrambler.exe
Again Still in the left panel, locate and delete the key:
avp.exe
Again Still in the left panel, locate and delete the key:
wireshark.exe
Again Still in the left panel, locate and delete the key:
ComboFix.exe
Again Still in the left panel, locate and delete the key:
MSASCui.exe
Again Still in the left panel, locate and delete the key:
MpCmdRun.exe
Again Still in the left panel, locate and delete the key:
msseces.exe
Again Still in the left panel, locate and delete the key:
MsMpEng.exe
Close Registry Editor.

Step 4

Delete this registry value

[ Learn More ]

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\svchost
- Description = "Microsoft svchost"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\svchost
- DysplayName = "Svchost"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\svchost
- ImagePath = "%User Profile%\Application Data\svchost.exe"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\svchost
- Type = "1"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\svchost
- Start = "2"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\svchost
- ErrorControl = "1"

In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\Microsoft\Sysinternals
- 3243 = "{malware path and file name}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rstrui.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AvastSvc.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avconfig.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AvastUI.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avscan.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\instup.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mbam.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mbamgui.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mbampt.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mbamscheduler.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mbamservice.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\hijackthis.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\spybotsd.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ccuac.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avcenter.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avguard.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avgnt.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avgui.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avgcsrvx.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avgidsagent.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avgrsx.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avgwdsvc.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\egui.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\zlclient.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bdagent.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\keyscrambler.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avp.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\wireshark.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ComboFix.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MSASCui.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MpCmdRun.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msseces.exe
- Debugger = "%User Profile%\My Documents\Google.com"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MsMpEng.exe
- Debugger = "%User Profile%\My Documents\Google.com"

To delete the registry value this malware/grayware created:

Open Registry Editor.
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
» For Windows Vista, Windows 7, and Windows Server 2008 (R2) users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, and Windows Server 2012 (R2) users, right-click on the lower-left corner of the screen, click Run, type regedit in the text box provided, and then press Enter.
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>svchost
In the right panel, locate and delete the entry:
Description = "Microsoft svchost"
Again In the right panel, locate and delete the entry:
DysplayName = "Svchost"
Again In the right panel, locate and delete the entry:
ImagePath = "%User Profile%\Application Data\svchost.exe"
Again In the right panel, locate and delete the entry:
Type = "1"
Again In the right panel, locate and delete the entry:
Start = "2"
Again In the right panel, locate and delete the entry:
ErrorControl = "1"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>VB and VBA Program Settings>Microsoft>Sysinternals
In the right panel, locate and delete the entry:
3243 = "{malware path and file name}"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>rstrui.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>AvastSvc.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avconfig.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>AvastUI.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avscan.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>instup.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>mbam.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>mbamgui.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>mbampt.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>mbamscheduler.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>mbamservice.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>hijackthis.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>spybotsd.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>ccuac.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avcenter.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avguard.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avgnt.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avgui.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avgcsrvx.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avgidsagent.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avgrsx.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avgwdsvc.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>egui.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>zlclient.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>bdagent.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>keyscrambler.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>avp.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>wireshark.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>ComboFix.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>MSASCui.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>MpCmdRun.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>msseces.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Image File Execution Options>MsMpEng.exe
In the right panel, locate and delete the entry:
Debugger = "%User Profile%\My Documents\Google.com"
Close Registry Editor.

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = "0"
  To: Hidden = ""2""

In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- Load = "%System%\Microsoft.com"

Step 6

Search and delete this folder

[ Learn More ]

Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.

%Program Files%\Windows Services

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DROPPR.GSF. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

{malware path and file name}:zone.identifier

Did this description help? Tell us how we did.

TROJ_DROPPR.GSF

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters