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TROJ_MEDFOS.COC

September 07, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

W32/Medfos.QA!tr (Fortinet), a variant of Win32/Medfos.QI trojan (ESET)

 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

This Trojan may be downloaded by other malware/grayware from remote sites.

It executes then deletes itself afterward.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

203,264 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Jun 2013

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • TSPY_FAREIT.UX

It may be downloaded from the following remote sites:

  • http://{BLOCKED}lake.com/ngY.exe
  • http://{BLOCKED}.5.170/PXVYGJx.exe

Installation

This Trojan executes then deletes itself afterward.

It injects codes into the following process(es):

  • msiexec.exe

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}.131.151/uploading/id={random value}&u={random string}

As of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.962.05

FIRST VSAPI PATTERN DATE:

05 Jun 2013

VSAPI OPR PATTERN File:

9.963.00

VSAPI OPR PATTERN Date:

06 Jun 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_MEDFOS.COC

    • TSPY_FAREIT.UX

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_MEDFOS.COC. 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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