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TROJ_MEDFOS.CWT

August 14, 2013
 Analysis by: Alvin Bacani
 ALIASES:

Trojan.Win32.Midhos.cbba (Kaspersky); Trojan.Medfos.RRE (Malwarebytes)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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 executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size:

197,120 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

07 Aug 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.

Installation

This Trojan executes then deletes itself afterward.

Other Details

This Trojan attempts to access the following websites to download files, which are possibly malicious:

  • http://cdn147.{BLOCKED}stingupload.com
  • http://{BLOCKED}.{BLOCKED}.140.151/uploading/id=1351678001&u=4WaevjA+sJYdbzvDmxr6vGH2KIR5yzNqTnuGnhaLacviRtjYIg2xc6QMAWYaZM4RqxalcusDRHEPWzPgeOT1zQ==

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.202.05

FIRST VSAPI PATTERN DATE:

07 Aug 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 to delete files detected as TROJ_MEDFOS.CWT. 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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