Analysis by: jasperm
ALIASES:

Kaspersky : Trojan.Win32.FraudPack.cioa ; Mcafee : FakeAlert-PA; Fortinet : W32/Refroso.JUA!tr

 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 saves the downloaded file, which is detected as TROJ_FAKEAV.GXX in a specific folder.

This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: Varies
File Type: PE
Memory Resident: No
Initial Samples Received Date: 10 Nov 2010
Payload: Downloads files

Arrival Details

This Trojan may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Download Routine

This Trojan accesses the following websites to download files:

  • http://{string1}.{string2}{random number}.com/index.php?{parameters}
  • http://{string1}.{string2}{random number}.com/?{parameters}
  • http://{string1}.{string2}{random number}.net/index.php?{parameters}
  • http://{string1}.{string2}{random number}.net/?{parameters}

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan does the following:

  • It saves the downloaded file which is detected as TROJ_FAKEAV.GXX in the %User Temp% folder.
  • It uses any of the following for String 1 when connecting to websites:
    • report
    • report1
    • report2
    • update
    • update1
    • update2
  • It uses a combination of any of the following for String 2:
    • disgan
    • domain
    • dostum
    • estwood
    • frost
    • grover
    • istorg
    • klapton
    • liwnar
    • mining
    • nalbin
    • nartiv
    • peren
    • plerk
    • query
    • quzonk
    • report
    • revcon
    • spectr
    • statistic
    • storage
    • traden
    • tyscon
    • update
    • usting
    • veter
    • wlentor
    • yanka
    • zulet

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.685.00
VSAPI PATTERN Date: 07 Dec 2010
VSAPI PATTERN Date: 12/7/2010 12:00:00 AM

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

Remove malware files dropped/downloaded by TROJ_FAKEAV.SMVK

     TROJ_FAKEAV.GXX

Step 3

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