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TROJ_DLOADR.PDC

October 12, 2012
 ALIASES:

TrojanDownloader:Win32/Small.gen!BQ (Microsoft); Downloader.a!px (McAfee); Trojan-Downloader.Win32.Agent.gxlv (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Gen:Variant.Buzy.3561 (FSecure)

 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 Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

94,208 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Mar 2012

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %Program Files%\Ultiiy Lmuackci\Explorer.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It creates the following folders:

  • %Program Files%\Ultiiy Lmuackci
  • %Program Files%\Mpnrltwxeh

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This Trojan deletes the following files:

  • %Program Files%\Mpnrltwxeh\Path.rcd

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\123456

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}7.221.106:9009/id.txt
  • http://{BLOCKED}7.221.106:9009/id2.txt

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Delete this registry key

[ 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\
    • 123456

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.
  • %Program Files%\Ultiiy Lmuackci
  • %Program Files%\Mpnrltwxeh

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.PDC. 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.

Step 5

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %Program Files%\Mpnrltwxeh\Path.rcd


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