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WORM_RIMECUD.SMI

October 16, 2013
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via removable drives

This worm drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

181,760 bytes

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

16 Mar 2010

Payload:

Downloads files

Installation

This worm adds the following folders:

  • %system root%\RECYCLER %system root%\RECYCLER\S-1-5-21-5423880567-1859940501-728432823-4609

It drops the following copies of itself into the affected system:

  • %system root%\RECYCLER\S-1-5-21-5423880567-1859940501-728432823-4609\hdav.exe

It drops the following files:

  • %system root%\RECYCLER\S-1-5-21-5423880567-1859940501-728432823-4609\Desktop.ini

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = %system root%\RECYCLER\S-1-5-21-5423880567-1859940501-728432823-4609\hdav.exe

Propagation

This worm creates the following folders in all removable drives:

  • DRIVE

It drops the following copy(ies) of itself in all removable drives:

  • DRIVE\file.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

[autorun]
open=DRIVE\file.exe
icon=%SystemRoot%\system32\SHELL32.dll,2
action=Open folder to view files
shell\open=Open shell\open\command=DRIVE\file.exe
shell\open\default=1

Download Routine

This worm accesses the following websites to download files:

  • http://www.{BLOCKED}ebtown.com/giknow/zone.exe - detected by Trend Micro as TROJ_BURNIX.SMEP

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It drops the file DRIVE\Desktop.ini in all removable drives.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

06.590.03

VSAPI PATTERN Date:

16 Mar 2010

VSAPI PATTERN Date:

3/16/2010 12:00:00 AM

VSAPI OPR PATTERN File:

06.927.00

VSAPI OPR PATTERN Date:

16 Mar 2010

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 dropped/downloaded by WORM_RIMECUD.SMI

    TROJ_BURNIX.SMEP

Step 3

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result. %System Root%\RECYCLER
DRIVE

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • Taskman = %System Root%\RECYCLER\S-1-5-21-5423880567-1859940501-728432823-4609\hdav.exe

Step 5

Search and delete AUTORUN.INF files created by WORM_RIMECUD.SMI that contain these strings

[ Learn More ]
[autorun]
open=DRIVE\file.exe
icon=%SystemRoot%\system32\SHELL32.dll,2
action=Open folder to view files
shell\open=Open shell\open\command=DRIVE\file.exe
shell\open\default=1

Step 6

Scan your computer with your Trend Micro product to delete files detected as WORM_RIMECUD.SMI. 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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