INF_RIMECUD.AQF

June 18, 2013
 Analysis by: Nikko Tamana
 ALIASES:

W32/AutoRun-AQO (Sophos), Worm/AutoRun (AVG), W32/AutoRun.AQO (Fortinet), Trojan.Win32.AutoRun.brp (Kaspersky), Worm:Win32/Rimecud!inf (Microsoft)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

It automatically executes files when a user opens a drive.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

INF

Initial Samples Received Date:

13 Jun 2013

Arrival Details

This Trojan may be dropped by the following malware:

  • WORM_RIMECUD

Propagation

The said .INF file contains the following strings:

autorun]
[autorun[
autorun[
[autorun
:jmp8
open=BOOTEX\thumbcache_131.exe
:jmp3
icon=%SystemDrive%\windowS\system32\SHELL32.dll,4
:jmp3
action=Open folder to view files using Windows Explorer
:jmp0
shell\\open\command=.////BOOTEX/thumbcache_131.exe
:jle7
shell\\\\explore\command=BOOTEX/thumbcache_131.exe
useautoplay=1
[AutoRun]
:GOTO NULL

Other Details

This Trojan automatically executes the following files when a user opens a drive:

  • {Removable Drive}:\BOOTEX\thumbcache_131.exe

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.978.03

FIRST VSAPI PATTERN DATE:

13 Jun 2013

VSAPI OPR PATTERN File:

9.979.00

VSAPI OPR PATTERN Date:

14 Jun 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file that dropped/downloaded INF_RIMECUD.AQF

  • WORM_RIMECUD

Step 3

Scan your computer with your Trend Micro product to delete files detected as INF_RIMECUD.AQF. 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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