TROJ_BREDO.ANX

 Analysis by: kathleenno

 ALIASES:

Downloader (Symantec); Trojan.Win32.Genome.sdke (Kaspersky); Generic.dx!zdu (Mcafee); Troj/Bredo-GX (Sophos)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This malware connects to URLs to download files. One of the downloaded files is detected as TROJ_FAKEAV.CBK. As a result, routines of the downloaded Trojan are exhibited in the affected computer.

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:

30,208 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

03 May 2011

Payload:

Downloads files

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.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}mmunications.ru/connect/load.php?file=document
  • http://{BLOCKED}mmunications.ru/connect/load.php?file=0

It saves the files it downloads using the following names:

  • {folder where malware is located}\document.doc
  • %User Profile%\Application Data\gog.exe - detected as TROJ_FAKEAV.CBK

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.134.05

FIRST VSAPI PATTERN DATE:

03 May 2011

VSAPI OPR PATTERN File:

8.135.00

VSAPI OPR PATTERN Date:

03 May 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

Remove malware files dropped/downloaded by TROJ_BREDO.ANX

     TROJ_FAKEAV.CBK

Step 3

Identify and terminate files detected as TROJ_BREDO.ANX

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

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.
  • {folder where malware is located}\document.doc

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_BREDO.ANX. 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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