TROJ_DOFOIL.KW

March 12, 2013
 Analysis by: Nikko Tamana
 ALIASES:

Mal/Zbot-LB (Sophos), W32/Yakes.B!tr (Fortinet), W32/Yakes.K2.gen!Eldorado (FProt), Trojan-Downloader.Win32.Dofoil (Ikarus), TrojanDownloader:Win32/Dofoil.R (Microsoft), a variant of Win32/Kryptik.AVAW trojan (NOD32), Trojan-Downloader.Win32.Dofoil (Sunbelt)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It attempts to access certain websites. However, the websites are inaccessible as of this writing. It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

39,936 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

22 Feb 2013

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other Details

This Trojan attempts to access certain websites. However, the websites are inaccessible as of this writing.

It connects to the following URL(s) to check for an Internet connection:

  • www.update.microsoft.com.nsatc.net

It connects to the following possibly malicious URL:

  • http://{BLOCKED}okucall2.org/tmp2/index.php

It deletes the initially executed copy of itself

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.746.03

FIRST VSAPI PATTERN DATE:

22 Feb 2013

VSAPI OPR PATTERN File:

9.747.00

VSAPI OPR PATTERN Date:

23 Feb 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

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DOFOIL.KW. 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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