Analysis by: Jennifer Gumban

ALIASES:

Trojan-Cleaver (McAfee); Trojan Horse (Symantec); Trojan.MSIL.Zapchast.qobu (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse PSW.MSIL.AARS (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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

It steals certain information from the system and/or the user. It logs a user's keystrokes to steal information.

  TECHNICAL DETAILS

File Size: 9,216 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 10 Jan 2015
Payload: Steals information

Arrival Details

This spyware 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 spyware drops the following file(s)/component(s):

  • %TEMP%\pdk-{username}\093e99f506efdfeda3e49656d5cfd64e\api.dll
  • %TEMP%\pdk-{username}\44126313885eaf8807ec01b9113f6704\perl516.dll
  • %TEMP%\pdk-{username}\78e0033a899004e6b769b93200e6b93e\file.dll
  • %TEMP%\pdk-{username}\8940f9a1fb9cc35b5e74564c532f672b\ansi.dll
  • %TEMP%\pdk-{username}\a47179aca60dab96afa6872f74273a87\util.dll
  • %TEMP%\pdk-{username}\b36254430b2a9f376684cba16f3e055d\fcntl.dll
  • %TEMP%\pdk-{username}\e2b382434aaa9e0e70faecb94af327f8\io.dll
  • %TEMP%\pdk-{username}\e93caf38761f724c8acbdbefa703e1de\posix.dll
  • %TEMP%\pdk-{username}\fac512929907694f0769a78a2fac3b6e\threads.dll

Other System Modifications

This spyware adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
Network Connectivity Manager

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
Network Connectivity Manager
EventMessageFile = "%Windows%\Microsoft.NET\Framework\v2.0.50727\EventLogMessages.dll"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application
Sources = "{random characters}"

(Note: The default value data of the said registry entry is {random values}.)

Information Theft

This spyware steals the following information:

  • User name
  • User Password
  • Credit card information
  • Web browser history

It logs a user's keystrokes to steal information.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 11.334.02
FIRST VSAPI PATTERN DATE: 09 Dec 2014
VSAPI OPR PATTERN File: 11.335.00
VSAPI OPR PATTERN Date: 10 Dec 2014

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete the files detected as TSPY_PRATM.A

*Note: Some component files may be hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.

To stop the malware/grayware from running when certain files are opened:

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Right-click Start then click Search....
  2. In the File name* input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012 (R2):

  1. Open a Windows Explorer window.
    • For Windows Vista, 7, and Server 2008 users, click Start>Computer.
    • For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen,then click File Explorer.
  2. In the Search Computer/This PC input box, type the name of the file that was detected earlier.
  3. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 4

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\SYSTEM\ControlSet001\Services\Eventlog\Application
    • Network Connectivity Manager

Step 5

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\SYSTEM\ControlSet001\Services\Eventlog\Application\Network Connectivity Manager
    • EventMessageFile = %Windows%\Microsoft.NET\Framework\v2.0.50727\EventLogMessages.dll

Step 6

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application
    • From: Sources = {random characters}
      To: Sources = {random values}

Step 7

Scan your computer with your Trend Micro product to delete files detected as TSPY_PRATM.A. 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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