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BKDR_ZEGOST.KU

July 10, 2013
 Analysis by: Rika Joi Gregorio
 ALIASES:

Trojan:Win32/Redosdru.L(Microsoft), a variant of Win32/Farfli.AK 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:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This backdoor arrives as a component bundled with malware/grayware packages.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

94,247 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

09 Jul 2013

Arrival Details

This backdoor arrives as a component bundled with malware/grayware packages.

Installation

This backdoor drops the following files:

  • %System%\pitemp.dat
  • {malware path}\mtemp.dat

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}ons.net:443

It requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.144.03

FIRST VSAPI PATTERN DATE:

09 Jul 2013

VSAPI OPR PATTERN File:

10.145.00

VSAPI OPR PATTERN Date:

10 Jul 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

Restart in Safe Mode

[ Learn More ]

Step 3

Search and delete this file

[ 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.  
  • %System%\pitemp.dat
  • {malware path}\mtemp.dat

Step 4

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