Analysis by: Michael Jay Villanueva
ALIASES:

Backdoor:ASP/Ace.T (Microsoft); Backdoor.ASP.Ace.be (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be dropped by other malware.

It requires its main component to successfully perform its intended routine. It gathers information and reports it to its servers.

  TECHNICAL DETAILS

File Size: 42,801 bytes
File Type: ASP
Memory Resident: No
Initial Samples Received Date: 10 Aug 2016

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be dropped by other malware.

Backdoor Routine

This backdoor may also compose messages that can be part of its spamming routine.

Other Details

This backdoor requires its main component to successfully perform its intended routine.

It does the following:

  • Upload and Read Files
  • Executes commandline parameters

It gathers the following information and reports it to its servers:

  • Machine Name
  • Machine's User Accounts
    Uses the command: "c:\windows\system32\cmd.exe" /c net user

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 12.706.03
FIRST VSAPI PATTERN DATE: 10 Aug 2016
VSAPI OPR PATTERN File: 12.707.00
VSAPI OPR PATTERN Date: 11 Aug 2016

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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as HTML_ACE.WTS. 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.


Did this description help? Tell us how we did.