Analysis by: Rika Joi Gregorio
 Modified by: Anthony Joe Melgarejo
ALIASES:

VirTool:Win32/CeeInject(Microsoft), W32/Tepfer.AAX!tr.pws(Fortinet), Trojan-PWS.Win32.Fareit(Ikarus), Win32/Injector.ANFU trojan(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:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Trojan may be downloaded by other malware/grayware from remote sites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 24,204 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 24 Sep 2013
Payload: Downloads files

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • JAVA_EKSPLOYT.HP

Installation

This Trojan adds the following mutexes to ensure that only one of its copies runs at any one time:

  • hed334d3d

It injects codes into the following process(es):

  • explorer.exe

Download Routine

This Trojan accesses the following websites to download files:

  • http://www.{BLOCKED}adran.com/blog/index.php

It saves the files it downloads using the following names:

  • %User Temp%\~!#{random value}.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

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

As of this writing, the said sites are inaccessible.

Other Details

This Trojan executes the downloaded file using the following commands:

  • regsvr32.exe -s %User Temp%\~!#{random value}.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 10.306.02
FIRST VSAPI PATTERN DATE: 28 Sep 2013
VSAPI OPR PATTERN File: 10.307.00
VSAPI OPR PATTERN Date: 29 Sep 2013

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 that dropped/downloaded TROJ_KARAGANY.RJ

    • JAVA_EKSPLOYT.HP

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these files

[ Learn More ]
There may be some files that are 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.
  • %User Temp%\~!#{random value}.tmp

Step 5

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