TROJ_BUZUS.SM

June 08, 2013
 Modified by: Mark Joseph Manahan
 ALIASES:

Mal/Dropper-G, Mal/Dropper-G (Sophos), PWS:Win32/OnLineGames.GM (Microsoft), BackDoor-DOQ.gen.w (McAfee), a variant of Win32/Injector.I trojan (Eset), Suspicious.SillyFDC (Symantec)

 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.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

381,440 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 Apr 2010

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 component file(s):

  • %Windows%\comres.dll
  • %Windows%\hedgepig.dat
  • %Windows%\my_sfc_os.dll
  • %System%\comresreal.dll

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

Other Details

This Trojan attempts to access the following websites to download files, which are possibly malicious:

  • http://{BLOCKED}4.cn/t2/houmen/rows.exe

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

6.972.06

FIRST VSAPI PATTERN DATE:

05 Apr 2010

VSAPI OPR PATTERN File:

6.973.00

VSAPI OPR PATTERN Date:

06 Apr 2010

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

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.
  • %Windows%\comres.dll
  • %Windows%\hedgepig.dat
  • %Windows%\my_sfc_os.dll
  • %System%\comresreal.dll

Step 4

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