TROJ_SEDNIT.TOK

April 01, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Trojan:Win32/Sednit.A (Microsoft), Mal/DwnLdr-X (Sophos)

 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: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This Trojan may be dropped by other malware.

As of this writing, the said sites are inaccessible.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size:

11,264 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

30 Mar 2013

Payload:

Collects system information, Connects to URLs/IPs, Downloads files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_ARTIEF.TOK

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}.{BLOCKED}.221.10/~alex/cgi-bin/sptr.cgi?{Computer Name}{random characters}
  • http://{BLOCKED}.{BLOCKED}.221.10/~alex/cgi-bin/qfa.cgi?{Computer Name}{random characters}
  • http://{BLOCKED}.{BLOCKED}.221.10/~alex/cgi-bin/mpk.cgi?{Computer Name}{random characters}

It saves the files it downloads using the following names:

  • %User Temp%\msmvs.exe
  • %Windows%\msmvs.exe

(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.)

As of this writing, the said sites are inaccessible.

Information Theft

This Trojan retrieves the following information from the affected system:

  • Computer Name
  • Infection Status

Stolen Information

This Trojan sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}.{BLOCKED}.221.10/~alex/cgi-bin/brvc.cgi?{Computer Name}{random characters}

Other Details

This Trojan requires the following additional components to properly run:

  • netui.dll

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.826.03

FIRST VSAPI PATTERN DATE:

30 Mar 2013

VSAPI OPR PATTERN File:

9.827.00

VSAPI OPR PATTERN Date:

30 Mar 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

Remove the malware/grayware file that dropped/downloaded TROJ_SEDNIT.TOK

    • TROJ_ARTIEF.TOK

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these files

[ Learn More ]
There may be some 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.
  • %User Temp%\msmvs.exe
  • %Windows%\msmvs.exe
  • netui.dll

Step 5

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

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_SEDNIT.TOK. 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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