Analysis by: Roland Marco Dela Paz
ALIASES:

W32/PROXY.AHB!tr (Fortinet)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

It conceals it's creator's identity when performing malicious activities. It does this by hiding his/her real location when issuing request(s).It also performs DNS requests to a certain site. As of writing, however, the server's response is the loopback address, 127.0.0.1.

This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware.

It acts as a proxy server to allow remote malicious user to use the affected systems to hide their identities when performing malicious activities.

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

  TECHNICAL DETAILS

File Size: 32,768 bytes
File Type: PE
Initial Samples Received Date: 23 Nov 2010
Payload: Acts as a proxy server

Arrival Details

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

It may be dropped by other malware.

Proxy Server Routine

This Trojan acts as a proxy server to allow remote malicious user to use the affected systems to hide their identities when performing malicious activities.

Other Details

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

It does the following:

  • Conceals the malware creator's identity when performing malicious activities. It does this by hiding his/her real location whenever he/she issues request(s).
  • Performs DNS requests to the following site:
    • https://{BLOCKED}nifty-user.com:443/
    As of writing, however, the server's response is the loopback address, 127.0.0.1.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 6.102.03
FIRST VSAPI PATTERN DATE: 01 May 2009

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 TROJ_PROXY.AHB

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as TROJ_PROXY.AHB

[ 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 TROJ_PROXY.AHB. 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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