Analysis by: Rika Joi Gregorio
ALIASES:

Worm:Win32/Morto.gen!B(Microsoft), Mal/Morto-A(Sophos), a variant of Win32/Morto.P worm(Eset)

 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: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 16,384 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 29 Nov 2012

Arrival Details

This worm may be dropped by other malware.

NOTES:

This malware tries to open the file \\TsClient\A\Moto if it is running in rundll32.dll. If successful, it executes the bytes in the file \\TsClient\A\Moto. It then forcefully logs the user off.

If the malware is not executing in rundll32.dll, it reads the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\Wpa
md = {random values}

It then executes the returned {random values}.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.562.06
FIRST VSAPI PATTERN DATE: 30 Nov 2012
VSAPI OPR PATTERN File: 9.563.00
VSAPI OPR PATTERN Date: 01 Dec 2012

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

Scan your computer with your Trend Micro product and note files detected as WORM_MORTO.DH

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as WORM_MORTO.DH

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_MORTO.DH. 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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