Analysis by: Lord Alfred Remorin
ALIASES:

Trojan:Win32/Dynamer!dtc (Microsoft), a variant of Win32/Ixeshe.C (Nod32)

 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 executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 172,032 bytes
Memory Resident: No
Initial Samples Received Date: 24 Aug 2012
Payload: Connects to URLs/IPs

Arrival Details

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

Backdoor Routine

This backdoor opens the following ports:

  • 6000

It executes the following commands from a remote malicious user:

  • Transfer files to and from remote server
  • List files and directories
  • Delete files
  • List all drives with corresponding drive types
  • List running processes
  • Create and terminate processes
  • Command shell

It connects to the following websites to send and receive information:

  • ip.jeroy.{BLOCKED}z.com
  • port.jeroy.{BLOCKED}z.com

It posts the following information to its command and control (C&C) server:

  • List of files and directories
  • List of drive information
  • Upload files to remote server

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 9.346.03
VSAPI OPR PATTERN Date: 24 Aug 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 BKDR_DYNAMER.X. 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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