JS_AGENT.AYMN

October 08, 2012
 Analysis by: Marfel Tiamzon
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be hosted on a website and run when a user accesses the said website.

This is the Trend Micro detection for files that exhibit certain behaviors.

  TECHNICAL DETAILS

File Size:

3,473 bytes

File Type:

Script

Memory Resident:

Yes

Initial Samples Received Date:

17 Aug 2010

Arrival Details

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

It may be hosted on a website and run when a user accesses the said website.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}b.kfc.ha.cn:6668/Down/my/124.exe - detected as TROJ_AGENT.JAAB

Other Details

Based on analysis of the codes, it has the following capabilities:

  • Upon opening a compromised file, this script attempts to connect to websites to download other malicious files or display advertisements. Note that the contents of the URL it connects to may change any time.

This is the Trend Micro detection for:

  • Files that are compromised through the insertion of an obfuscated script.

  SOLUTION

Minimum Scan Engine:

8.900

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

Close all opened browser windows

Step 3

Remove malware files dropped/downloaded by JS_AGENT.AYMN

     TROJ_AGENT.JAAB

Step 4

Scan your computer with your Trend Micro product to delete files detected as JS_AGENT.AYMN. 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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