TROJ_RENOS.BX


 ALIASES:

Trojan:Win32/Wantvi.K (Microsoft); Downloader-BHL (McAfee); Suspicious.DLoader (Symantec); Trojan.Win32.Qhost.aes, Trojan.Win32.Qhost.aes (Kaspersky); BehavesLike.Win32.Malware.ssc (mx-v) (Sunbelt); Trojan.FakeAlert.PL (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

34,816 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

26 Aug 2012

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:

  • %System%\printer.exe
  • %System%\spoolvs.exe
  • %Windows%\shell.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Printer = "%System%\printer.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Spoolsv = "%System%\spoolvs.exe"

It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe %Windows%\shell.exe"

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

Other System Modifications

This Trojan modifies the following file(s):

  • %System%\drivers\etc\hosts

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It adds the following registry keys:

HKEY_CLASSES_ROOT\.xht

HKEY_CLASSES_ROOT\.xhtml

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\WindowsUpdate\
AU

HKEY_CURRENT_USER\Software\Policies\
Microsoft\windows\Windows Update

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion
SUID = "10373"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion
BAR23ID = "a6f4554bfe8283fe36eb4755b3bd11fb"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name}:*:enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name}:*:enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name}:*:enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name}:*:enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%System%\printer.exe = "%System%\printer.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%System%\printer.exe = "%System%\printer.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\printer.exe = "%System%\printer.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\printer.exe = "%System%\printer.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%System%\spoolvs.exe = "%System%\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%System%\spoolvs.exe = "%System%\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\spoolvs.exe = "%System%\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%System%\spoolvs.exe = "%System%\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%Windows%\shell.exe = "%Windows%\shell.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%Windows%\shell.exe = "%Windows%\shell.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Windows%\shell.exe = "%Windows%\shell.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Windows%\shell.exe = "%Windows%\shell.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%User Startup%\findfast.exe = "%User Startup%\findfast.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%User Startup%\findfast.exe = "%User Startup%\findfast.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Startup%\findfast.exe = "%User Startup%\findfast.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Startup%\findfast.exe = "%User Startup%\findfast.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%Common Startup%\autorun.exe = "%Common Startup%\autorun.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%Common Startup%\autorun.exe = "%Common Startup%\autorun.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Common Startup%\autorun.exe = "%Common Startup%\autorun.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Common Startup%\autorun.exe = "%Common Startup%\autorun.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
2500 = "3"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1208 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
ShowedCheckBrowser = "Yes"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Check_Associations = "No"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion
Upd_Version2 = "30223084"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion
TssVersion2 = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
EnableBalloonTips = "1"

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\WindowsUpdate\
AU
AutoUpdate = "1"

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\Windows Update
NoAutoUpdate = "1"

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\Windows Update
NoWindowsUpdate = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%windir%\system32\winav.exe = "%windir%\system32\winav.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%windir%\system32\winav.exe = "%windir%\system32\winav.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%windir%\system32\winav.exe = "%windir%\system32\winav.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%windir%\system32\winav.exe = "%windir%\system32\winav.exe:*:Enabled:@xpsp2res.dll,-22019"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Enable Browser Extensions = "yes"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion
fVersion2 = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%User Profile%\Application Data\mcrupdate.exe = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%User Profile%\Application Data\mcrupdate.exe = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\mcrupdate.exe = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\mcrupdate.exe = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%User Profile%\Application Data\sysdefender.exe = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile\AuthorizedApplications\
List
%User Profile%\Application Data\sysdefender.exe = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\sysdefender.exe = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\sysdefender.exe = "{random characters}"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
CurrentLevel = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1608 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1200 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1001 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1004 = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1201 = "1"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1406 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1601 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1800 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1A05 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1C00 = "3"

(Note: The default value data of the said registry entry is 20000.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1E05 = "3"

(Note: The default value data of the said registry entry is 30000.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1804 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1A04 = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\0
1A00 = "0"

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
DisableRegistryTools = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
DisableTaskMgr = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoControlPanel = "1"

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\Application Data\spoolsvc.dll
  • %User Profile%\Application Data\mcrupdate.exe
  • %User Startup%\findfast.exe
  • %Common Startup%\autorun.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}p.info/l3/?{random characters}
  • http://{BLOCKED}p.info/getupdate.php?{random characters}
  • http://{BLOCKED}-defender.com/demo.php?wmid=6021&pwebmid=10373

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Identify and delete files detected as TROJ_RENOS.BX using either the Startup Disk or Recovery Console

[ Learn More ]

Step 3

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

Step 4

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_CLASSES_ROOT
    • .xht
  • In HKEY_CLASSES_ROOT
    • .xhtml
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\WindowsUpdate
    • AU
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\windows
    • Windows Update

Step 5

Delete this registry value

[ 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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Printer = "%System%\printer.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Spoolsv = "%System%\spoolvs.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion
    • SUID = "10373"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion
    • BAR23ID = "a6f4554bfe8283fe36eb4755b3bd11fb"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • {malware path and file name} = "{malware path and file name}:*:enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • {malware path and file name} = "{malware path and file name}:*:enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • {malware path and file name} = "{malware path and file name}:*:enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • {malware path and file name} = "{malware path and file name}:*:enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %System%\printer.exe = "%System%\printer.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %System%\printer.exe = "%System%\printer.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\printer.exe = "%System%\printer.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\printer.exe = "%System%\printer.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %System%\spoolvs.exe = "%System%\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %System%\spoolvs.exe = "%System%\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\spoolvs.exe = "%System%\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %System%\spoolvs.exe = "%System%\spoolvs.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %Windows%\shell.exe = "%Windows%\shell.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %Windows%\shell.exe = "%Windows%\shell.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Windows%\shell.exe = "%Windows%\shell.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Windows%\shell.exe = "%Windows%\shell.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %User Startup%\findfast.exe = "%User Startup%\findfast.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %User Startup%\findfast.exe = "%User Startup%\findfast.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Startup%\findfast.exe = "%User Startup%\findfast.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Startup%\findfast.exe = "%User Startup%\findfast.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %Common Startup%\autorun.exe = "%Common Startup%\autorun.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %Common Startup%\autorun.exe = "%Common Startup%\autorun.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Common Startup%\autorun.exe = "%Common Startup%\autorun.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Common Startup%\autorun.exe = "%Common Startup%\autorun.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 2500 = "3"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1208 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • ShowedCheckBrowser = "Yes"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Check_Associations = "No"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion
    • Upd_Version2 = "30223084"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion
    • TssVersion2 = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • EnableBalloonTips = "1"
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\WindowsUpdate\AU
    • AutoUpdate = "1"
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Windows Update
    • NoAutoUpdate = "1"
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Windows Update
    • NoWindowsUpdate = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %windir%\system32\winav.exe = "%windir%\system32\winav.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %windir%\system32\winav.exe = "%windir%\system32\winav.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %windir%\system32\winav.exe = "%windir%\system32\winav.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %windir%\system32\winav.exe = "%windir%\system32\winav.exe:*:Enabled:@xpsp2res.dll,-22019"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Enable Browser Extensions = "yes"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion
    • fVersion2 = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %User Profile%\Application Data\mcrupdate.exe = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %User Profile%\Application Data\mcrupdate.exe = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Profile%\Application Data\mcrupdate.exe = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Profile%\Application Data\mcrupdate.exe = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %User Profile%\Application Data\sysdefender.exe = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List
    • %User Profile%\Application Data\sysdefender.exe = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Profile%\Application Data\sysdefender.exe = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %User Profile%\Application Data\sysdefender.exe = "{random characters}"

Step 6

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\Internet Settings\Zones\0
    • CurrentLevel = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1608 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1200 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1001 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1004 = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • From: 1201 = "1"
      To: 1201 = ""1""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1406 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1601 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1800 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1A05 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • From: 1C00 = "3"
      To: 1C00 = ""20000""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • From: 1E05 = "3"
      To: 1E05 = ""30000""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1804 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1A04 = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\0
    • 1A00 = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: Shell = "Explorer.exe %Windows%\shell.exe"
      To: Shell = ""Explorer.exe""

Step 7

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Profile%\Application Data\spoolsvc.dll
  • %User Profile%\Application Data\mcrupdate.exe
  • %User Startup%\findfast.exe
  • %Common Startup%\autorun.exe

Step 8

Scan your computer with your Trend Micro product to delete files detected as TROJ_RENOS.BX. 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 9

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %System%\drivers\etc\hosts


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