WORM_GAMARUE.V
Worm:Win32/Gamarue.I (Microsoft), Trojan.Win32.Jorik.Androm.rn (Kaspersky), Downloader.Dromedan (Symantec),Troj/Zbot-CFJ (Sophos), Trojan:W32/Inject.GZ (FSecure), Trojan.Win32.Generic!BT (Sunbelt), W32/Zbot.ADM!tr (Fortinet)
Windows 2000, Windows XP, Windows Server 2003

Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Downloaded from the Internet
This worm 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 itself after execution.
TECHNICAL DETAILS
47,104 bytes
Yes
09 Jul 2012
Arrival Details
This worm 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 worm drops the following copies of itself into the affected system:
- %System Root%\Documents and Settings\All Users\Local Settings\Temp\{random}.exe
- %System Root%\Documents and Settings\All Users\svchost.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random numbers} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\{random}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SunJavaUpdateSched = "%System Root\%Documents and Settings\All Users\svchost.exe"
Other System Modifications
This worm creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path} = "{malware path}:Enabledlack Splitters"
Backdoor Routine
This worm opens the following port(s) where it listens for remote commands:
- 8000
Other Details
This worm deletes itself after execution.
SOLUTION
9.200
9.246.04
09 Jul 2012
9.247.00
10 Jul 2012
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
Step 3
Search and delete files detected as WORM_GAMARUE.V
Step 4
Delete this registry value
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
- SunJavaUpdateSched = "%System Root\%Documents and Settings\All Users\svchost.exe"
- SunJavaUpdateSched = "%System Root\%Documents and Settings\All Users\svchost.exe"
Step 5
Delete the registry entry with an unknown data value
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\policies\Explorer\Run
- {random numbers} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\{random}.exe"
- {random numbers} = "%System Root%\Documents and Settings\All Users\Local Settings\Temp\{random}.exe"
Step 6
Delete this registry value
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\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path} = "{malware path}:Enabledlack Splitters"
- {malware path} = "{malware path}:Enabledlack Splitters"
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_GAMARUE.V. 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.
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