Analysis by: Christopher Daniel So
ALIASES:

TrojanDownloader:Win32/Cekar (Microsoft), Trojan-Downloader.Win32.Agent.aseg (Kaspersky)

 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 Trojan may be dropped by other malware. It may be manually installed by a user.

  TECHNICAL DETAILS

File Size: 55,046 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 16 Jun 2011

Arrival Details

This Trojan may be dropped by other malware.

It may be manually installed by a user.

Dropping Routine

This Trojan drops the following files:

  • %System%\VDFInstallPatch

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

NOTES:

This malware does its main routine when the command-line parameter -INSTALL is specified.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.228.10
FIRST VSAPI PATTERN DATE: 16 Jun 2011
VSAPI OPR PATTERN File: 8.229.00
VSAPI OPR PATTERN Date: 17 Jun 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

Search and delete this file

[ 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. %System%\VDFInstallPatch

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.AWBC. 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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