Analysis by: Christopher Daniel So
ALIASES:

VirTool:Win32/DelfInject.gen!BI (Microsoft), P2P-Worm.Win32.Palevo.knp (Kaspersky), Backdoor.Win32.EggDrop.bmg (Sunbelt), W32/Worm.BJYB (FProt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This worm arrives by connecting affected removable drives to a system.

It drops copies of itself in all removable drives. It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

  TECHNICAL DETAILS

File Size: 132,096 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 09 Dec 2010

Arrival Details

This worm arrives by connecting affected removable drives to a system.

Other System Modifications

This worm adds the following registry entries as part of its installation routine:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = "{malware path and file name}"

Propagation

This worm drops copies of itself in all removable drives.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

Other Details

This worm sets the attributes of the following file(s) to Hidden and System:

  • {malware path and file name}

It does the following:

  • The dropped AUTORUN.INF is detected as TROJ_AUTORUN.FIM.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.690.02
VSAPI PATTERN Date: 09 Dec 2010
VSAPI PATTERN Date: 12/9/2010 12:00:00 AM
VSAPI OPR PATTERN File: 7.712.15
VSAPI OPR PATTERN Date: 21 Dec 2010

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

Scan your computer with your Trend Micro product and note files detected as WORM_AUTORUN.MIF

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as WORM_AUTORUN.MIF

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

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 NT\CurrentVersion\Winlogon
    • Taskman={malware path and file name}

Step 6

Remove malware files dropped/downloaded by WORM_AUTORUN.MIF

    TROJ_AUTORUN.FIM

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_AUTORUN.MIF. 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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