Analysis by: Christopher Daniel So
ALIASES:

Trojan.Win32.AutoRub.azq (Kaspersky), Trojan.Win32.AutoRun (Ikarus)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 313 bytes
File Type: INF
Memory Resident: No
Initial Samples Received Date: 18 Feb 2011

Arrival Details

This Trojan may be dropped by the following malware:

  • WORM_SASFIS.MI

Propagation

The said .INF file contains the following strings:

[autorun]
USEAUTOPLAY=1
shellexecute=fakerica//shmekerica.exe
Shell\do\something
icon=fakerica//shmekerica.exe
open=fakerica//shmekerica.exe
action=Open folder to see files using Windows Explorer
shell\\\\\\Open\\\\\\command=fakerica//shmekerica.exe
shell\\\\\\Explore\\\\\\command=fakerica//shmekerica.exe

NOTES:

This is the Trend Micro detection for AUTORUN.INF files 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
FIRST VSAPI PATTERN FILE: 7.844.09
FIRST VSAPI PATTERN DATE: 18 Feb 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 malware files dropped/downloaded by TROJ_ARUN.ASM

    WORM_SASFIS.MI

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_ARUN.ASM. 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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