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TROJ_FAKEAV.FCZ

October 08, 2012
 Analysis by: Kathleen Notario
 PLATFORM:

Windows 98, ME, NT, 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 arrives as an attachment to email messages spammed by other malware/grayware or malicious users. However, as of this writing, the said sites are inaccessible.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

15,872 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

19 Jul 2010

Payload:

Connects to URLs/Ips, Drops files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

However, as of this writing, the said sites are inaccessible.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Printers\Connections
affid = {random}

HKEY_CURRENT_USER\Printers\Connections
subid = {random}

Dropping Routine

This Trojan drops the following files:

  • C:\Documents and Settings\All Users\Favorites\_favdata.dat

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}c-Increases.com/ms05/ad
  • http://www.{BLOCKED}dead.com/ms05/ad
  • http://www.{BLOCKED}pesearch.com/ms05/ad

It deletes itself after execution.

  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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Printers\Connections
    • affid={random}
  • In HKEY_CURRENT_USER\Printers\Connections
    • subid={random}

Step 3

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • C:\Documents and Settings\All Users\Favorites\_favdata.dat

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.FCZ. 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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