TROJ_VB.POPPM

December 10, 2014
 Analysis by: Adrian Cofreros
 ALIASES:

Win32/Agent.WPO(NOD32),Trojan-Dropper.Win32.Injector.laci(Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It 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:

EXE, RTF

Memory Resident:

No

Initial Samples Received Date:

09 Dec 2014

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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 drops the following files:

  • %User Temp%\{random}.txt

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops and executes the following files:

  • %All Users Profile%\{OS}-KB{random}.exe <--contains packages to be installed on affected system e.g powershell
  • %All Users Profile%\Microsoft-KB{random}.exe

(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}orn.tv/hookersnord.com/wp-includes/js/imgareaselect/gkcjrmgkrcjgcrtcrtrccr/crtbtybtyvtytytbyt.exe
  • http://www.{BLOCKED}unter.com/counter.php?tcrcrcerererwbvbbrtdf
  • http://www.{BLOCKED}unter.com/counter.php?vtrtvrvtrtvertvr

NOTES:

It connects to the following non-malicious sites:

  • http://go.microsoft.com/{url path}
  • http://download.microsoft.com/{url path}

It executes Powershell commands.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.332.04

FIRST VSAPI PATTERN DATE:

09 Dec 2014

VSAPI OPR PATTERN File:

11.333.00

VSAPI OPR PATTERN Date:

10 Dec 2014

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\{random}.txt
  • %All Users Profile%\{OS}-KB{random}.exe
  • %All Users Profile%\Microsoft-KB{random}.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_VB.POPPM. 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.


Did this description help? Tell us how we did.