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WORM_GAMARUE.D

February 08, 2013
 Analysis by: rolandde
 ALIASES:

Worm:Win32/Gamarue.B (Microsoft); W32/Gamarue-F (Sophos)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 200

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm arrives as attachment to mass-mailed email messages.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

46,080 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 Nov 2011

Arrival Details

This worm arrives as attachment to mass-mailed email messages.

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

(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"

Other Details

This worm connects to the following website to send and receive information:

  • {BLOCKED}shopdrm.ru

  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

Restart in Safe Mode

[ Learn More ]

Step 3

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\policies\Explorer\Run
    • {random numbers} = %System Root%\Documents and Settings\All Users\Local Settings\Temp\{random}.exe

Step 4

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