Analysis by: Christopher Daniel So
ALIASES:

Worm:Win32/Rimecud!inf (Microsoft), Worm.Win32.AutoRun.hqb (Kaspersky)

 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

  OVERVIEW

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 710 bytes
File Type: INF
Initial Samples Received Date: 14 Jun 2011

Arrival Details

This Trojan may be dropped by the following malware:

  • WORM_PALEVO.SMGA

NOTES:

This is the Trend Micro detection for AUTORUN.INF files dropped by WORM_PALEVO.SMGA.

It is used by WORM_PALEVO.SMGA to automatically execute the dropped copies of WORM_PALEVO.SMGA in removable drives. The said .INF file contains the following strings:

;2438uxZysrgOsS3oPi9WHNrYpmhdh la
[autorun]
open=U3ROM/system32.exe
;kjcxziuyyuc^^dj[
icon=U3ROM/default.ico
;jdkaZysrgOsS3oPi9WHNrYpmkjfjkasdfh
action=Open
;1s0PSq7YZysrgOsS3oPi9WHNrYpmdP5v8736B4yu4d2I2308cT\8
shell\\open\\command=U3ROM/system32.exe
shell\\explore\\command=U3ROM/system32.exe
useautoplay=1
:GOTO NUL
;]2y3ZysrgOsS3oPi9WHNrYpm\lV=66q8

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 8.224.06
FIRST VSAPI PATTERN DATE: 14 Jun 2011
VSAPI OPR PATTERN File: 8.225.00
VSAPI OPR PATTERN Date: 14 Jun 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 the malware/grayware file that dropped/downloaded TROJ_OTORUN.GK

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_OTORUN.GK. 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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