Analysis by: Nikko Tamana
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

  TECHNICAL DETAILS

File Size: Varies
Memory Resident: Yes
Initial Samples Received Date: 04 Oct 2012

Arrival Details

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

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

Download Routine

This Trojan connects to the following malicious URLs:

  • {BLOCKED}4.{BLOCKED}5.128.94
  • {BLOCKED}4.{BLOCKED}5.128.120
  • {BLOCKED}8.{BLOCKED}9.112.123
  • {BLOCKED}2.{BLOCKED}8.11.134
  • {BLOCKED}8.{BLOCKED}5.230.1
  • {BLOCKED}5.5.99.20
  • {BLOCKED}2.{BLOCKED}8.83.8

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.441.00
FIRST VSAPI PATTERN DATE: 04 Oct 2012
VSAPI OPR PATTERN File: 9.442.05
VSAPI OPR PATTERN Date: 05 Oct 2012

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 TROJ_ENKRYPT.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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