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TROJ_MEDFOS.AWX

February 01, 2013
 Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan:Win32/Medfos.A (Microsoft), Trojan.Win32.Midhos.aoor (Kaspersky), a variant of Win32/Medfos.JC 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 dropped by other malware.

It exports functions used by other malware. It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

164,864 bytes

Memory Resident:

Yes

Initial Samples Received Date:

31 Jan 2013

Arrival Details

This Trojan may be dropped by other malware.

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware file name} = "rundll32.exe "{malware path and file name}",PixelMap"

Other Details

This Trojan exports functions used by other malware.

It connects to the following possibly malicious URL:

  • {BLOCKED}n.cdn165.fileshostingetc.com
  • {BLOCKED}load.com/upload/fid={value}

It requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.692.03

FIRST VSAPI PATTERN DATE:

31 Jan 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

Scan your computer with your Trend Micro product and note files detected as TROJ_MEDFOS.AWX

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\Windows\CurrentVersion\Run
    • {malware file name} = "rundll32.exe "{malware path and file name}",PixelMap"

Step 5

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