Analysis by: Michael Cabel
 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

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 opens a hidden Internet Explorer window.

  TECHNICAL DETAILS

File Size: 69,632 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 07 Apr 2009

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.

Installation

This Trojan drops the following files:

  • %Current Folder%\s32.txt

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Sft
(Default) = "{71C92868-6439-478C-BF86-3AF882BB7C4A}"

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}hairev.ru
  • www.{BLOCKED}b.de

It opens a hidden Internet Explorer window.

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 5.883.00
VSAPI OPR PATTERN Date: 07 Apr 2009

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

Scan your computer with your Trend Micro product and note files detected as TROJ_DANMEC.AA

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Sft
    • (Default) = "{71C92868-6439-478C-BF86-3AF882BB7C4A}"

Step 5

Search and delete the file detected as TROJ_DANMEC.AA

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 6

Search and delete this file

[ 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.
  • %Current Folder%\s32.txt

Step 7

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