TROJ_AGCI.A

October 08, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Trojan:Win32/Bumat!rts (Microsoft), Trojan.Win32.BHO.agci (Kaspersky), W32/Ripinip.A.gen!Eldorado (FProt)

 PLATFORM:

Windows 2000, XP, 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:

90,112 bytes

File Type:

DLL

Memory Resident:

No

Initial Samples Received Date:

09 Feb 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.

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}

HKEY_CLASSES_ROOT\PWFlash.PowerFlash

HKEY_CLASSES_ROOT\PWFlash.PowerFlash.1

It adds the following registry entries to install itself as a Browser Helper Object (BHO):

HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}
(Default) = "PowerFlash Class"

HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}\
InprocServer32
ThreadingModel = "Apartment"

HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}\
ProgID
(Default) = "PWFlash.PowerFlash.1"

HKEY_CLASSES_ROOT\CLSID\{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}\
VersionIndependentProgID
(Default) = "PWFlash.PowerFlash"

HKEY_CLASSES_ROOT\PWFlash.PowerFlash
(Default) = "PowerFlash Class"

HKEY_CLASSES_ROOT\PWFlash.PowerFlash.1
(Default) = "PowerFlash Class"

HKEY_CLASSES_ROOT\PWFlash.PowerFlash.1\CLSID
(Default) = "{DC888631-57F5-4AF4-86B3-BDE5F854DCBF}"

HKEY_CLASSES_ROOT\PWFlash.PowerFlash\CurVer
(Default) = "PWFlash.PowerFlash.1"

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.826.08

FIRST VSAPI PATTERN DATE:

09 Feb 2011

VSAPI OPR PATTERN File:

7.827.00

VSAPI OPR PATTERN Date:

10 Feb 2011

NOTES:

Trend customers:

    Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.

All Internet users:

  • Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
  • Catch malware/grayware before they affect your PC or network. Secure your Web world with Trend Micro products that offer the best anti-threat and content security solutions for home users, corporate users, and ISPs. Go here for more information on Trend Micro products that fit your needs.


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