Analysis by: Sabrina Lei Sioting
ALIASES:

Win32/Agent.QEP (Eset), Backdoor:Win32/Tranikpik.A (Microsoft), Backdoor.Winnti.B (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

Infection Channel: Downloaded from the Internet, Dropped by other malware

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 runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

  TECHNICAL DETAILS

File Size: 86,016 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 14 Feb 2014
Payload: Compromises system security

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.

Backdoor Routine

This backdoor executes the following command(s) from a remote malicious user:

  • End - End Current Task
  • Execute - Run Application
  • Help - Show Help
  • ShareShell - Share a shell to other
  • TrasFile - Download or upload file to ftp
  • Uninstall - Uninstall
  • zxplug - install plugins

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

  • {BLOCKED}ffers.com

NOTES:

It requires additional components to run properly.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.606.01
FIRST VSAPI PATTERN DATE: 14 Feb 2014
VSAPI OPR PATTERN File: 10.607.00
VSAPI OPR PATTERN Date: 16 Feb 2014

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

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_ZXSHELL.V. 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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