Analysis by: kathleenno
ALIASES:

Trojan.Mdropper (Symantec); Troj/RTFDrp-D (Sophos); CVE-2010-3333!Camelot (Authentium)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Once this Trojan successfully exploits the said vulnerability, it attempts to drop and execute a malicious file.

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 the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 163,065 bytes
File Type: RTF
Memory Resident: Yes
Initial Samples Received Date: 04 May 2011

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.

Dropping Routine

This Trojan takes advantage of the following software vulnerabilities to drop malicious files:

  • Microsoft Security Bulletin MS10-087

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Other Details

More information on this vulnerability can be found below:

  • http://www.microsoft.com/technet/security/bulletin/ms10-087.mspx

NOTES:
Once this Trojan successfully exploits the said vulnerability, it attempts to drop and execute the following malicious file:

  • %Current%\server.exe - detected as BKDR_PROTUX.GE

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.136.02
FIRST VSAPI PATTERN DATE: 04 May 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TROJ_ARTIEF.GJT

    BKDR_PROTUX.GE

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_ARTIEF.GJT. 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 4

Download and apply these security patches Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors.  http://www.microsoft.com/technet/security/bulletin/ms10-087.mspx


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