Analysis by: Rhena Inocencio
ALIASES:

Rogue:JS/Winwebsec (Microsoft), JS/FakePAV (McAfee), Trojan.HTML.FakeAlert.ac (Sunbelt)

 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

Infection Channel: Downloaded from the Internet

This Trojan executes when a user accesses certain websites where it is hosted.

  TECHNICAL DETAILS

File Size: Varies
File Type: HTML, HTM
Memory Resident: No
Initial Samples Received Date: 27 Oct 2012
Payload: Displays message/message boxes, Downloads files

Arrival Details

This Trojan executes when a user accesses certain websites where it is hosted.

Rogue Antivirus Routine

This Trojan displays the following fake alerts:

It displays the following window and pretends to scan the system:

NOTES:

Upon closing the browser, this Trojan displays the following message box:

It attempts to access the URL http://{hosted site}/?c=RaEdMCsEyD9o2pcO17KNED++ne2mVXnHy4mjwXhRf8nAluVQznWWinHO1wFBiRpfsWVOwr9LK5bkhQ==. It accesses the URL to download a possibly malicious file.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.490.01
FIRST VSAPI PATTERN DATE: 27 Oct 2012
VSAPI OPR PATTERN File: 9.491.00
VSAPI OPR PATTERN Date: 28 Oct 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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as HTML_FAKEAV.EHN. 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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