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Threat Encyclopedia

WORM_KOOBFACE.AV

ANALYSIS BY

Roland Marco Dela Paz


ALIASES:

Trojan.Win32.Jorik.Koobface.bd (Kaspersky); TrojanDownloader:Win32/Utagent.A (Microsoft)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:Worm

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.360.02

FIRST VSAPI PATTERN DATE:

17 Aug 2011

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

Remove malware files dropped/downloaded by WORM_KOOBFACE.AV

     TROJ_SPAMMER.AA
    WORM_KOOBFACE.AV
    WORM_KOOBFACE.FE
    WORM_KOOBFACE.FH
    WORM_KOOBFACE.FI
    WORM_KOOBFACE.FK
    WORM_KOOBFACE.MJ
    WORM_KOOBFACE.MM

Step 3

Identify and terminate files detected as WORM_KOOBFACE.AV

[ Learn More ]
  1. 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.
  2. 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
    • trr = {malware path and file name}

Step 5

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.
%User Temp%\{file name of downloaded torrent}

Step 6

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.
%Current%\123.tmp
%User Temp%\iexplore.exe

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_KOOBFACE.AV. 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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