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TROJ_UNDEF.QI
Aliases: Trojan:Win32/Provis!rts (Microsoft); [CTFMON.EXE]:Generic.dx!nml (McAfee); Trojan.ADH (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Gen:Win32.Malware.AqZ@aGtzrWbH (FSecure)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows XP, Windows Server 2003
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: 435,895 bytes
File type: EXE
Memory resident: No
Initial samples received date: 25 Nov 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.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR SFX

It adds the following registry entries:

HKEY_CURRENT_USER\Software\WinRAR SFX
C%%WINDOWS%system32% = "%System%\"

Dropping Routine

This Trojan drops the following files:

  • __tmp_rar_sfx_access_check_47562
  • ctfmon.exe

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

Delete this registry key

[ 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_CURRENT_USER\Software
    • WinRAR SFX

Step 3

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_CURRENT_USER\Software\WinRAR SFX
    • C%%WINDOWS%system32%="%System%\"

Step 4

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.
  • __tmp_rar_sfx_access_check_47562
  • ctfmon.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_UNDEF.QI. 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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Analysis By: Automation

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