TROJ_DROPPR.SMAG

October 09, 2012
 Analysis by: kathleenno
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • 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.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

DLL

Initial Samples Received Date:

25 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.

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CLASSES_ROOT\PROTOCOLS\Filter\
text/html
(Default) = "Microsoft Improved HTML MIME Filter"

HKEY_CLASSES_ROOT\PROTOCOLS\Filter\
text/html
CLSID = "{random CLSID}"

HKEY_CLASSES_ROOT\CLSID\{random CLSID}\
InProcServer32
(Default) = "%User Temp%\msmonitor"

HKEY_CLASSES_ROOT\CLSID\{random CLSID}\
InProcServer32
ThreadingModel = "Apartment"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\msmonitor

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)