BKDR_ZEGOST.ER

October 12, 2012

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 Modified by: Christopher Daniel So

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 ALIASES:

Mal/EncPk-CK (Sophos), BDS/Zegost.Gen (AntiVir), Backdoor.Win32.Zegost (Ikarus)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:

 DAMAGE POTENTIAL:

 DISTRIBUTION POTENTIAL:

 REPORTED INFECTION:

• 
  Threat Type: Backdoor
• 
  Destructiveness: No
• 
  Encrypted: Yes
• 
  In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

This backdoor is a corrupted variant of the BKDR_ZEGOST family.

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:

296,960 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

04 Oct 2012

Payload:

Displays graphics/image

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.

NOTES:

This backdoor displays the following message:

It is a corrupted variant of the BKDR_ZEGOST family.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.440.03

FIRST VSAPI PATTERN DATE:

04 Oct 2012

VSAPI OPR PATTERN File:

9.441.00

VSAPI OPR PATTERN Date:

05 Oct 2012

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

Scan your computer with your Trend Micro product to delete files detected as BKDR_ZEGOST.ER. 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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