Modified by: Sabrina Lei Sioting
ALIASES:

TrojanDownloader:Win32/Horst.M (Microsoft), Mal/Horst-E (Sophos), W32/Horst.BD!tr (Fortinet), Win32/TrojanProxy.Horst.CB (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: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 22,528 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 17 Jul 2009

Arrival Details

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other Details

This worm connects to the following possibly malicious URL:

  • http://{BLOCKED}od.com/up/calc.bin
  • http://{BLOCKED}ink.com/?&publicid=72b67aeb-32ba-4635-be5a-30d584ab8336&domainname=medbod.com

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 6.282.02
FIRST VSAPI PATTERN DATE: 17 Jul 2009

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

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