Analysis by: Mark Joseph Manahan
ALIASES:

Backdoor.ASP.Agent.b (Kaspersky), Backdoor.ASP.Agent (Ikarus), Trojan.Malscript (Symantec)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 5,269 bytes
File Type: ASP
Memory Resident: No
Initial Samples Received Date: 28 Nov 2013

Arrival Details

This backdoor may be dropped by other malware.

It may be manually installed by a user.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Enumerate / List Directories and Drives
  • Upload, Download and Delete files
  • Execute Shell Command

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.440.06
FIRST VSAPI PATTERN DATE: 28 Nov 2013
VSAPI OPR PATTERN File: 10.441.00
VSAPI OPR PATTERN Date: 29 Nov 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as HTML_ASPDOOR.L. 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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