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Aliases: Mal/ExpJS-AV (Webroot)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: Yes
In the wild: Yes


Infection Channel: Downloaded from the Internet

This Trojan may be downloaded unknowingly by a user when visiting malicious website(s).

Technical Details

File size: 16,759 bytes
File type: JS
Initial samples received date: 10 Jan 2013
Payload: Downloads files

Arrival Details

This Trojan may be downloaded unknowingly by a user when visiting the following malicious website(s):


Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED} - detected as TROJ_REVETON.RG
  • http://{BLOCKED} - detected as JAVA_EXPLOIT.RG
  • http://{BLOCKED}
  • http://{BLOCKED}
  • http://{BLOCKED}
  • http://{BLOCKED}
  • http://{BLOCKED}


This malware checks for vulnerable software (such as Java, Adobe Reader, and Adobe Flash) to download and execute a malicious file.


Minimum scan engine: 9.300
First VSAPI Pattern File: 9.648.06
First VSAPI Pattern Release Date: 10 Jan 2013
VSAPI OPR Pattern Version: 9.649.00
VSAPI OPR Pattern Release Date: 11 Jan 2013

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

Remove malware/grayware files dropped/downloaded by HTML_EXPLOIT.RG

Step 3

Close all opened browser windows

Step 4

Scan your computer with your Trend Micro product to delete files detected as HTML_EXPLOIT.RG. 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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Analysis By: Mark Joseph Manahan

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