Analysis by: Michael Cabel
 Modified by: Rika Joi Gregorio
ALIASES:

TrojanDownloader:Win32/Karagany.A(Microsoft), Trojan.Win32.Karagany.a (v)(Sunbelt), Trojan-Downloader.Win32.Karagany(Ikarus)

 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: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

  TECHNICAL DETAILS

File Size: 48,128 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 14 Jun 2013

Arrival Details

This backdoor 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 backdoor drops the following files:

  • %Application Data%\Adobe\plugs\mmc{random digit}.exe
  • %Application Data%\Adobe\shed\thr1.chm

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

It creates the following folders:

  • %Application Data%\Adobe\plugs
  • %Application Data%\Adobe\shed

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

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}loy.vv.cc/showthread.php?t=642761

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 8.368.03
FIRST VSAPI PATTERN DATE: 20 Aug 2011
VSAPI OPR PATTERN File: 8.369.00
VSAPI OPR PATTERN Date: 21 Aug 2011

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

Restart in Safe Mode

[ Learn More ]

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.  
  • %Application Data%\Adobe\plugs
  • %Application Data%\Adobe\shed

Step 4

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