BKDR_RAMNIT.KT

June 07, 2018

Analysis by: Hazel Ann Poligratis

ALIASES:

Trojan:Win32/Ramnit (Microsoft), Mal/Elenoocka-E (Sophos)

PLATFORM:

Windows

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

INFORMATION EXPOSURE:

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

OVERVIEW

Infection Channel: Dropped by other malware

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

It deletes registry entries related to antivirus programs. Doing this allows this malware to execute its routines without being detected by installed antivirus programs.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

TECHNICAL DETAILS

File Size: 166,912 bytes

File Type: , EXE

Memory Resident: Yes

Initial Samples Received Date: 13 Mar 2018

Payload: Connects to URLs/IPs, Compromises system security

Arrival Details

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

%User Startup%\{8 Random Characters}.exe
%AppDataLocal%\{Random Folder Name}\{8 Random Characters}.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following copies of itself into the affected system and executes them:

%User Temp%\{8 Random Characters}.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following files:

%AppDataLocal%\{8 Random Characters}.log
%AppDataLocal%\{Random Folder Name}\{Random Characters}.tmp
%ProgramData%\{8 Random Characters}.log

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops and executes the following files:

%AppDataLocalLow%\com.{User name}.sdb - file was deleted afterwards
%AppDataLocalLow%\cmd.{User name}.bat - file was deleted afterwards

(Note: %AppDataLocalLow% is the protected mode folder of Internet Explorer, where it usually is C:\Users\{user name}\AppData\LocalLow on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

{GUID}

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{8 Random Character} = %AppDataLocal%\{Random Folder Name}\{8 Random Characters}.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = {Default value for Userinit},%AppDataLocal%\{Random Folder Name}\{8 Random Character}.exe

Other System Modifications

This Backdoor adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
jfghdug_ooetvtgk = TRUE

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusOverride = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallOverride = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesDisableNotify = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UacDisableNotify = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\wscsvc
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\MpsSvc
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\wscsvc
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\WinDefend
Start = 4

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\wuauserv
Start = 4

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center\Svc
AntiVirusOverride = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
svchost.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
consent.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
rundll32.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
spoolsv.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
explorer.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
rgjdu.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
afwqs.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.tmp = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.dll = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
svchost.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
consent.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
rundll32.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
spoolsv.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
explorer.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
rgjdu.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
afwqs.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.tmp = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.dll = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.exe = 0

It deletes the following registry entries related to antivirus and security applications:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Windows Defender = {Windows Defender path}

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\AppCompatFlags\
Custom\iscsicli.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\AppCompatFlags\
InstalledSDB\{GUID}

Backdoor Routine

This Backdoor executes the following command(s) from a remote malicious user:

kos - Remove HKEY_LOCAL_MACHINE\SOFTWARE, HKEY_LOCAL_MACHINE\SYSTEM, HKEY_LOCAL_MACHINE\HARDWARE, and HKEY_CURRENT_USER\SOFTWARE, and then force the system to shutdown
screen - Take and upload a screenshot
update - Update itself
getexec - Download and execute a file
cookies - Send a created log file that contains cookies and upload to a remote location
removecookies - Deletes cookies

It connects to the following URL(s) to send and receive commands from a remote malicious user:

It uses domain generation algorithm (DGA) for its C&C servers. Where the domain could be one of the following:
- {BLOCKED}noeqkvnue.com
- {BLOCKED}mvop.com
- {BLOCKED}rvrn.com
- {BLOCKED}tiuuceto.com
- {BLOCKED}xo.com
- {BLOCKED}dir.com
- {BLOCKED}dqayfhvvv.com
- {BLOCKED}hkhldeyou.com
- {BLOCKED}marxwm.com
- {BLOCKED}rkxqdnuecblmg.com
- {BLOCKED}cymebqgbtcg.com
- {BLOCKED}vyijoyxjcmly.com
- {BLOCKED}jtxwxcocuti.com
- {BLOCKED}yceidxaj.com
- {BLOCKED}dghkisinfxvll.com
- {BLOCKED}yyhbsy6tw.com
- {BLOCKED}lnfx.com
- {BLOCKED}awcw.com
- {BLOCKED}limogan.com
- {BLOCKED}jebljtdvak.com
- {BLOCKED}dwnpc.com
- {BLOCKED}pl.com
- {BLOCKED}qxryqauxxcfkc.com
- {BLOCKED}lbaca.com
- {BLOCKED}opcaeki.com
- {BLOCKED}ygng.com
- {BLOCKED}aagnnrevjm.com
- {BLOCKED}qaxakwwi.com
- {BLOCKED}wwb.com
- {BLOCKED}vcsipcuuehvpq.com
- {BLOCKED}hlk.com
- {BLOCKED}qivoh.com
- {BLOCKED}rkbhivynnn.com
- {BLOCKED}lv.com
- {BLOCKED}dujn.com
- {BLOCKED}creyq.com
- {BLOCKED}hfmlochfir.com
- {BLOCKED}bebgxmd.com
- {BLOCKED}oufdpnruf.com
- {BLOCKED}ra.com
- {BLOCKED}kicmbutylymv.com
- {BLOCKED}jebmvsejvib.com
- {BLOCKED}foijvjn.com
- {BLOCKED}qsfqnugs.com
- {BLOCKED}onrrqgxvrc.com
- {BLOCKED}qbubcnmmrs.com
- {BLOCKED}cqredi.com
- {BLOCKED}yfetd.com
- {BLOCKED}yfbguufjy.com
- {BLOCKED}qlyfp.com
- {BLOCKED}aoomn.com

Other Details

This Backdoor connects to the following URL(s) to check for an Internet connection:

google.com:80
bing.com:80
yahoo.com:80

It does the following:

It executes and injects its DLL component in the process:
- svchost.exe
It uses the following vulnerability to escalate its privilege:
- MS13-053
- MS14-058
It executes the following command:
- "%System%\sdbinst.exe" /q "%User Temp%\..\..\LocalLow\com.{User name}.sdb"
- "%System%\sdbinst.exe" /q /u "%User Temp%\..\..\LocalLow\com.{User name}.sdb"
- cmd /c %User Temp%\..\..\LocalLow\cmd.{User name}.bat
It attempts to hide itself from Windows defender by executing the following commands:
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Extensions \" /v *.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Extensions \" /v *.dll /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Extensions \" /v *.tmp /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Processes \" /v afwqs.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Processes \" /v rgjdu.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Processes \" /v explorer.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Processes \" /v spoolsv.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Processes \" /v rundll32.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Processes \" /v consent.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Microsoft Antimalware\\Exclusions\\Processes \" /v svchost.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Extensions \" /v *.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Extensions \" /v *.dll /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Extensions \" /v *.tmp /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Processes \" /v afwqs.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Processes \" /v rgjdu.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Processes \" /v explorer.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Processes \" /v spoolsv.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Processes \" /v rundll32.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Processes \" /v consent.exe /t REG_DWORD /d 0
- REG ADD \"HKLM\\SOFTWARE\\Microsoft\\Windows Defender\\Exclusions\\Processes \" /v svchost.exe /t REG_DWORD /d 0
It steals cookies from the following application:
- Internet Explorer
- Firefox
- Opera
- Flash
- Safari
- Chrome
It creates a named pipe:
- \\.\pipe\{8 random characters}

SOLUTION

Minimum Scan Engine: 9.850

FIRST VSAPI PATTERN FILE: 14.126.08

FIRST VSAPI PATTERN DATE: 13 Mar 2018

VSAPI OPR PATTERN File: 14.127.00

VSAPI OPR PATTERN Date: 14 Mar 2018

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {8 Random Character} = %AppDataLocal%\{Random Folder Name}\{8 Random Characters}.exe
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
- jfghdug_ooetvtgk = TRUE
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
- EnableLUA = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusOverride = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusDisableNotify = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallDisableNotify = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallOverride = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- UpdatesDisableNotify = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- UacDisableNotify = 1
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\wscsvc
- Start = 4
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- EnableFirewall = 0
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DoNotAllowExceptions = 0
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc
- AntiVirusOverride = 1
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- svchost.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- consent.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- rundll32.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- spoolsv.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- explorer.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- rgjdu.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- afwqs.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Extensions
- *.tmp = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Extensions
- *.dll = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Extensions
- *.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- svchost.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- consent.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- rundll32.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- spoolsv.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- explorer.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- rgjdu.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- afwqs.exe = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Extensions
- *.tmp = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Extensions
- *.dll = 0
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Extensions
- *.exe = 0

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 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 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_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run
In the right panel, locate and delete the entry:
{8 Random Character} = %AppDataLocal%\{Random Folder Name}\{8 Random Characters}.exe
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion
In the right panel, locate and delete the entry:
jfghdug_ooetvtgk = TRUE
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Policies>System
In the right panel, locate and delete the entry:
EnableLUA = 0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Security Center
In the right panel, locate and delete the entry:
AntiVirusOverride = 1
Again In the right panel, locate and delete the entry:
AntiVirusDisableNotify = 1
Again In the right panel, locate and delete the entry:
FirewallDisableNotify = 1
Again In the right panel, locate and delete the entry:
FirewallOverride = 1
Again In the right panel, locate and delete the entry:
UpdatesDisableNotify = 1
Again In the right panel, locate and delete the entry:
UacDisableNotify = 1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>wscsvc
In the right panel, locate and delete the entry:
Start = 4
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>SharedAccess>Parameters>FirewallPolicy>StandardProfile
In the right panel, locate and delete the entry:
EnableFirewall = 0
Again In the right panel, locate and delete the entry:
DoNotAllowExceptions = 0
Again In the right panel, locate and delete the entry:
DisableNotifications = 1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Security Center>Svc
In the right panel, locate and delete the entry:
AntiVirusOverride = 1
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows Defender>Exclusions>Processes
In the right panel, locate and delete the entry:
svchost.exe = 0
Again In the right panel, locate and delete the entry:
consent.exe = 0
Again In the right panel, locate and delete the entry:
rundll32.exe = 0
Again In the right panel, locate and delete the entry:
spoolsv.exe = 0
Again In the right panel, locate and delete the entry:
explorer.exe = 0
Again In the right panel, locate and delete the entry:
rgjdu.exe = 0
Again In the right panel, locate and delete the entry:
afwqs.exe = 0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows Defender>Exclusions>Extensions
In the right panel, locate and delete the entry:
*.tmp = 0
Again In the right panel, locate and delete the entry:
*.dll = 0
Again In the right panel, locate and delete the entry:
*.exe = 0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Microsoft Antimalware>Exclusions>Processes
In the right panel, locate and delete the entry:
svchost.exe = 0
Again In the right panel, locate and delete the entry:
consent.exe = 0
Again In the right panel, locate and delete the entry:
rundll32.exe = 0
Again In the right panel, locate and delete the entry:
spoolsv.exe = 0
Again In the right panel, locate and delete the entry:
explorer.exe = 0
Again In the right panel, locate and delete the entry:
rgjdu.exe = 0
Again In the right panel, locate and delete the entry:
afwqs.exe = 0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Microsoft Antimalware>Exclusions>Extensions
In the right panel, locate and delete the entry:
*.tmp = 0
Again In the right panel, locate and delete the entry:
*.dll = 0
Again In the right panel, locate and delete the entry:
*.exe = 0
Close Registry Editor.

Step 5

Restore this modified registry value

[ 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = {Default value for Userinit},%AppDataLocal%\{Random Folder Name}\{8 Random Character}.exe
  To: Userinit = {Default value for Userinit}
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\MpsSvc
- From: Start = 4
  To: Start = 2
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\wscsvc
- From: Start = 4
  To: Start = 2
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\WinDefend
- From: Start = 4
  To: Start = 2
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\wuauserv
- From: Start = 4
  To: Start = 2

To restore the registry value this malware/grayware modified:

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 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 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>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Winlogon
In the right panel, locate this registry entry:
Userinit = {Default value for Userinit},%AppDataLocal%\{Random Folder Name}\{8 Random Character}.exe
Right-click the value name and choose Modify. Change the value data of this entry to:
Userinit = {Default value for Userinit}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>MpsSvc
In the right panel, locate this registry entry:
Start = 4
Right-click the value name and choose Modify. Change the value data of this entry to:
Start = 2
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>wscsvc
In the right panel, locate this registry entry:
Start = 4
Right-click the value name and choose Modify. Change the value data of this entry to:
Start = 2
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>WinDefend
In the right panel, locate this registry entry:
Start = 4
Right-click the value name and choose Modify. Change the value data of this entry to:
Start = 2
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>wuauserv
In the right panel, locate this registry entry:
Start = 4
Right-click the value name and choose Modify. Change the value data of this entry to:
Start = 2
Close Registry Editor.

Step 6

Restore these deleted registry keys/values from backup

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Custom\iscsicli.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\InstalledSDB\{GUID}

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Windows Defender = {Windows Defender path}

Step 7

Search and delete these files

[ Learn More ]

There may be some files 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 Temp%\{8 Random Characters}.exe
%User Startup%\{8 Random Characters}.exe
%AppDataLocal%\{Random Folder Name}\{8 Random Characters}.exe
%AppDataLocal%\{8 Random Characters}.log
%AppDataLocal%\{Random Folder Name}\{Random Characters}.tmp
%ProgramData%\{8 Random Characters}.log
To delete malware/grayware files:

For Windows 2000, Windows XP, and Windows Server 2003:

Right-click Start then click Search....

In the File name* input box, type
%User Temp%\{8 Random Characters}.exe
%User Startup%\{8 Random Characters}.exe
%AppDataLocal%\{Random Folder Name}\{8 Random Characters}.exe
%AppDataLocal%\{8 Random Characters}.log
%AppDataLocal%\{Random Folder Name}\{Random Characters}.tmp
%ProgramData%\{8 Random Characters}.log

In the Look In drop-down list, select My Computer then press Enter.

Once located, select the file then press SHIFT+DELETE to delete it.
Repeat the said steps for all files listed.
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

Open a Windows Explorer window.
For Windows Vista, 7, and Server 2008 users, click Start>Computer.

For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.

In the Search Computer/This PC input box, type:
%User Temp%\{8 Random Characters}.exe
%User Startup%\{8 Random Characters}.exe
%AppDataLocal%\{Random Folder Name}\{8 Random Characters}.exe
%AppDataLocal%\{8 Random Characters}.log
%AppDataLocal%\{Random Folder Name}\{Random Characters}.tmp
%ProgramData%\{8 Random Characters}.log

Once located, select the file then press SHIFT+DELETE to delete it.

Repeat the said steps for all files listed.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_RAMNIT.KT. 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

Download and apply these security patches Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.

MS13-053

MS14-058

Did this description help? Tell us how we did.

BKDR_RAMNIT.KT

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters

BKDR_RAMNIT.KT

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters

The Americas

Middle East & Africa

Europe

Asia & Pacific