Analysis by: Marfel Tiamzon
ALIASES:

Microsoft: Worm:Win32/Rimecud!inf; Kaspersky: Trojan.Win32.AutoRun.bku; Sophos: Mal/AutoInf-A

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This is the Trend Micro detection for AUTORUN.INF files dropped by its worm component in removable drives.It is used to enable automatic execution of dropped copies of the main component whenever the drives are accessed.

  TECHNICAL DETAILS

File Size: 398 bytes
File Type: INF
Initial Samples Received Date: 06 Jul 2011

Propagation

The said .INF file contains the following strings:

;{garbage characters}
[autorun[
[autorun
open=USBVAU~1\microvault.exe
:cmp
icon=%SystemRoot%\system32\SHELL32.dll,4
;{garbage characters}
action=Open folder to view files using Windows Explorer
;{garbage characters}
;{garbage characters}
;{garbage characters}
shell\\open\\command=USBVAU~1/microvault.exe
;{garbage characters}
:nop
;{garbage characters}
shell\\explore\\\command=USVBAU~1/microvault.exe
;{garbage characters}
UseautoplAy=1

NOTES:

This is the Trend Micro detection for AUTORUN.INF files dropped by its worm component in removable drives.

It is used to enable automatic execution of dropped copies of the main component whenever the drives are accessed.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.270.01
FIRST VSAPI PATTERN DATE: 06 Jul 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

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