Analysis by: Mark Joseph Manahan
ALIASES:

Mal/Generic-L (Webroot) ,Trojan horse Downloader.Generic9.CEDC (AVG) ,W32/Agent.AWPP!tr.bdr (Fortinet) ,Trojan-Dropper.Agent (Ikarus) ,TrojanDownloader:Win32/Ompiw.A (Microsoft) ,BackDoor-ERZ (McAfee) ,a variant of Win32/Agent.WSG trojan (Eset) ,Backdoor.Trojan (Symantec) ,Suspicious file (Panda) ,BehavesLike.Win32.Malware.rwx (mx-v) (Sunbelt)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This backdoor may be dropped by other malware.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 53,248 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 03 Jan 2014
Payload: Connects to URLs/IPs, Compromises system security

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_PPDROP.AP

Installation

This backdoor adds the following mutexes to ensure that only one of its copies runs at any one time:

  • windowsupdate

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
IMJPMIG = "%User Temp%\explorer.exe"

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • execute 'microupdater.exe'
  • Gather OS version, Hostname, Ip Address, Network Information, Username, Timezone, Drive Information
  • File Manipulation : Find, Move, Change attribute, Delete, Create, Execute

It connects to the following websites to send and receive information:

  • {BLOCKED}ate.{BLOCKED}as.net:443

  SOLUTION

Minimum Scan Engine: 9.700

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

Remove malware/grayware files dropped/downloaded by BKDR_OMPIW.AB

    • TROJ_PPDROP.AP

Step 3

Identify and terminate files detected as BKDR_OMPIW.AB

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • IMJPMIG = "%User Temp%\explorer.exe"

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_OMPIW.AB. 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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