Analysis by: Sabrina Lei Sioting
ALIASES:

Net-Worm.Win32.Kido.ih (Kaspersky), W32.Downadup!autorun (Symantec), W32.Downadup (Symantec),

 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

Infection Channel: Propagates via removable drives

This Trojan may be dropped by other malware.

This is the Trend Micro detection for files that exhibit certain behaviors.

  TECHNICAL DETAILS

File Size: 56,588 bytes
File Type: INF
Initial Samples Received Date: 02 Jan 2009

Arrival Details

This Trojan may be dropped by the following malware:

  • WORM_DOWNAD family

Other Details

This is the Trend Micro detection for:

  • AUTORUN.INF files that are dropped by WORM_DOWNAD variants

NOTES:

It contains the following strings:

open=.\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665\jwgkvsq.vmx,ahaezedrn
shellexecute=.\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665\jwgkvsq.vmx,ahaezedrn

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 5.883.00
VSAPI OPR PATTERN Date: 05 May 2009

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_DOWNAD.AD

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DOWNAD.AD. 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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