Analysis by: Christopher Daniel So
ALIASES:

TrojanSpy:Win32/Fucobha.A (Microsoft), Trojan.Zbot (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.

  TECHNICAL DETAILS

File Size: 917,504 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 15 Sep 2011

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 files:

  • %Windows%\wdmaud.drv
  • {malware path}\magazine pages1_rcs.png

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}bit.com/dj/order/000C292E83E0_{current IP address}.jpg
  • http://www.{BLOCKED}bit.com/dj/upload.aspx?filepath=info&filename=000C292E83E0_{current IP address}.jpg
  • http://www.{BLOCKED}bit.com/dj/upload.aspx?filepath=ok&filename=000C292E83E0_{current IP address}.jpg

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.432.06
FIRST VSAPI PATTERN DATE: 16 Sep 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product and note files detected as TROJ_FUCOBHA.AA

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as TROJ_FUCOBHA.AA

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

Search and delete these files

[ Learn More ]
There may be some component 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%\wdmaud.drv
  • {malware path}\magazine pages1_rcs.png

Step 6

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