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WORM_GAMARUE.GN

July 24, 2013
 ALIASES:

Worm:Win32/Gamarue.I (Microsoft), Trojan-Spy.Win32.Zbot.nmsl (Kaspersky), Downloader.Dromedan (Norton)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

File Size:

79,512 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

19 Jul 2013

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:

  • %All Users Profile%\svchost.exe
  • %All Users Profile%\{Random File Name}.exe

(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)

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 Number} = "%User Profile%\{Random File Name}.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SunJavaUpdateSched = "%All Users Profile%\svchost.exe"

Other Details

This worm connects to the following possibly malicious URL:

  • http://{BLOCKED}s.pl/qingdao.php
  • http://{BLOCKED}x.pl/villahermosa.php
  • http://{BLOCKED}ix.pl/warradale.php
  • http://{BLOCKED}ia.ru/beijing.php
  • http://{BLOCKED}i.ru/warradale.php

It deletes itself after execution.

NOTES:
When WORM_GAMARUE.GN is run on Windows Vista and Windows 7, it drops a copy of itself as %System Root%\Users\All Users\svchost.exe and %System Root%\Program Data\svchost.exe.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.166.04

FIRST VSAPI PATTERN DATE:

20 Jul 2013

VSAPI OPR PATTERN File:

10.167.00

VSAPI OPR PATTERN Date:

21 Jul 2013

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 Number} = "%User Profile%\{Random File Name}.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • SunJavaUpdateSched = "%All Users Profile%\svchost.exe"

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_GAMARUE.GN. 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 5

Scan your computer with your Trend Micro product and note files detected as WORM_GAMARUE.GN


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