Analysis by: Michael Cabel
ALIASES:

Symantec: Backdoor.Trojan; Kaspersky: Backdoor.Win32.Agent.aqom; Mcafee: AdClicker-IR

 PLATFORM:

Windows 2000, XP, 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 arrives as a file that exports the functions of other malware/grayware. It may be dropped by other malware. It arrives as a component bundled with malware/grayware packages.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 35,464 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 05 Jan 2011

Arrival Details

This backdoor arrives as a file that exports the functions of other malware/grayware.

It may be dropped by other malware.

It arrives as a component bundled with malware/grayware packages.

Backdoor Routine

This backdoor opens the following port(s) where it listens for remote commands:

  • TCP 9001

Other Details

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

It does the following:

  • Installed as a system service to enable automatic execution at every system startup.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.748.08
FIRST VSAPI PATTERN DATE: 05 Jan 2011

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 and note files detected as BKDR_NODEF.RA

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as BKDR_NODEF.RA

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

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