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TROJ_AGENT_042916.TOMB

October 10, 2012
 ALIASES:

TrojanDropper:Win32/Dogrobot.G (Microsoft); Generic Dropper!1v3 (McAfee); Trojan.Dropper (Symantec); Backdoor.Win32.Agent.bbxd (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.5208823 (FSecure)

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

47,641 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

11 Sep 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:

  • %Program Files%\MSDN

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This Trojan deletes the following files:

  • %Program Files%\MSDN\.
  • %Program Files%\MSDN\..
  • %Program Files%\MSDN\qwegier.exe
  • %User Temp%\.
  • %User Temp%\..
  • %User Temp%\dd_vcredistMSI5DA7.txt
  • %User Temp%\dd_vcredistMSI6BB9.txt
  • %User Temp%\dd_vcredistUI5DA7.txt
  • %User Temp%\dd_vcredistUI6BB9.txt
  • %User Temp%\Perflib_Perfdata_42c.dat
  • %User Temp%\Perflib_Perfdata_740.dat
  • %User Temp%\_$Df
  • %Temporary Internet Files%\.
  • %Temporary Internet Files%\..
  • %Temporary Internet Files%\Content.IE5
  • %Temporary Internet Files%\desktop.ini

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.)

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\TimeZoneInformation
ActiveTimeBias = "{random values}"

(Note: The default value data of the said registry entry is 1e0.)

Dropping Routine

This Trojan drops the following files:

  • %System Root%\selfok
  • %Program Files%\MSDN\LHL13.sys
  • %System Root%\sysLoad
  • %Program Files%\MSDN\000000000
  • %Program Files%\MSDN\PciDisk.sys
  • %Program Files%\MSDN\qwegier.exe
  • %System%\drivers\SoftDaemo.sys

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Other Details

This Trojan deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restore this modified 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\SYSTEM\ControlSet001\Control\TimeZoneInformation
    • From: ActiveTimeBias = "{random values}"
      To: ActiveTimeBias = ""1e0""

Step 3

Search and delete these files

[ Learn More ]
There may be some component 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.
  • %System Root%\selfok
  • %Program Files%\MSDN\LHL13.sys
  • %System Root%\sysLoad
  • %Program Files%\MSDN\000000000
  • %Program Files%\MSDN\PciDisk.sys
  • %Program Files%\MSDN\qwegier.exe
  • %System%\drivers\SoftDaemo.sys

Step 4

Search and delete this folder

[ 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.
  • %Program Files%\MSDN

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT_042916.TOMB. 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.

  • %Program Files%\MSDN\.
  • %Program Files%\MSDN\..
  • %Program Files%\MSDN\qwegier.exe
  • %User Temp%\.
  • %User Temp%\..
  • %User Temp%\dd_vcredistMSI5DA7.txt
  • %User Temp%\dd_vcredistMSI6BB9.txt
  • %User Temp%\dd_vcredistUI5DA7.txt
  • %User Temp%\dd_vcredistUI6BB9.txt
  • %User Temp%\Perflib_Perfdata_42c.dat
  • %User Temp%\Perflib_Perfdata_740.dat
  • %User Temp%\_$Df
  • %Temporary Internet Files%\.
  • %Temporary Internet Files%\..
  • %Temporary Internet Files%\Content.IE5
  • %Temporary Internet Files%\desktop.ini


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