ALIASES:

TrojanDropper:Win32/QQplug.A (Microsoft); [00015bd8.EXE]:Generic PWS.y!bhu, [000055d8.EXE]:ProcKill-EY (McAfee); Trojan-Dropper.Win32.Agent.bdlr (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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: 136,433 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 07 Oct 2012

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.

Installation

This Trojan creates the following folders:

  • \?\C:\PROGRA~1\COMMON~1\Tencent
  • \?\C:\PROGRA~1\COMMON~1\Tencent\QQPlug
  • \?\C:\PROGRA~1\COMMON~1\Tencent\QQPlug\img

Other System Modifications

This Trojan deletes the following files:

  • \?\C:\PROGRA~1\COMMON~1\Tencent\QQPlug\ClickLoadDrv.dll

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\drmkaud
ImagePath = "\??\%Windows%\AntiVirus.sys"

(Note: The default value data of the said registry entry is {random values}.)

Dropping Routine

This Trojan drops the following files:

  • \?\C:\PROGRA~1\COMMON~1\Tencent\QQPlug\release.tmp
  • %Windows%\AntiVirus.sys

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

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

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\drmkaud
    • From: ImagePath = "\??\%Windows%\AntiVirus.sys"
      To: ImagePath = ""{random values}""

Step 3

Search and delete these components

[ Learn More ]
There may be some components 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.
  • \?\C:\PROGRA~1\COMMON~1\Tencent\QQPlug\release.tmp
  • %Windows%\AntiVirus.sys

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • \?\C:\PROGRA~1\COMMON~1\Tencent
  • \?\C:\PROGRA~1\COMMON~1\Tencent\QQPlug
  • \?\C:\PROGRA~1\COMMON~1\Tencent\QQPlug\img

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_QQPLUG.SMT. 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 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • \?\C:\PROGRA~1\COMMON~1\Tencent\QQPlug\ClickLoadDrv.dll


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