Analysis by: Erika Bianca Mendoza
 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.

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

  TECHNICAL DETAILS

File Size: 7813 bytes
File Type: VBS
Memory Resident: Yes
Initial Samples Received Date: 30 Mar 2011
Payload: Collects system information, Compromises system security

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_DROPPR.FA

Backdoor Routine

This Trojan connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}s.0fees.net/count/{computer name}{MAC Address}

Other Details

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

NOTES:
This script pauses for 30 seconds before executing its routines. It contains functions that are capable of doing the following:

  • Download/Upload files
  • Get IP address
  • Execute command using WScript.Shell
  • Terminate itself
  • Get host information

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.942.01
FIRST VSAPI PATTERN DATE: 30 Mar 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 VBS_WMIGHOST.A

Step 3

Scan your computer with your Trend Micro product and note files detected as VBS_WMIGHOST.A

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete the file detected as VBS_WMIGHOST.A

[ Learn More ]

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as VBS_WMIGHOST.A. 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 7

Scan your computer with your Trend Micro product to delete files detected as VBS_WMIGHOST.A. 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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