Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor may arrive bundled with malware packages as a malware component. It may be hosted on a website and run when a user accesses the said website.

  TECHNICAL DETAILS

File Size: 57,161 bytes
File Type: VBS
Memory Resident: No
Initial Samples Received Date: 23 Sep 2011

Arrival Details

This backdoor may arrive bundled with malware packages as a malware component.

It may be hosted on a website and run when a user accesses the said website.

NOTES:
Once a site is compromised, this backdoor allows the malicious user to execute the following commands on the server:

  • get (Get file server)
  • put (Put file on server)
  • del (Delete)
  • fdel (Folder delete)
  • ren (Rename)
  • error (Show error)
  • cmd (Execute Shell Command)
  • info (Display System Info)
  • reg (Registry)
  • txtview (Open text)
  • txtedit (Edit text)
  • download (Download file)
  • upload (Upload File)
  • mass (Mass action)
  • fcopy (Folder Copy)
  • filecopy (File Copy)
  • search (Search)
  • sqlserver (Check SQL Server)
  • about (About the creator)

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.450.01
FIRST VSAPI PATTERN DATE: 23 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 to delete files detected as VBS_ACE.CNI. 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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