TSPY_ZBOT.BK

April 25, 2013
 Modified by: Anthony Joe Melgarejo
 ALIASES:

a variant of Win32/Kryptik.AFZX trojan (NOD32), Troj/Agent-WJS (Sophos)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size:

360,960 bytes

File Type:

EXE

File Compression:

ASProtect

Memory Resident:

No

Initial Samples Received Date:

22 Apr 2009

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.

Other System Modifications

This spyware adds the following registry entries:

HKEY_CLASSES_ROOT\.key
(Default) = "regfile"

HKEY_CLASSES_ROOT\CLSID\{random values}
(Default) = "{random string}"

HKEY_CURRENT_USER\Software\ASProtect\
SpecData
(Default) = "73C2167373C21673"

HKEY_CURRENT_USER\Software\ASProtect\
SpecData
73C2167373C21673 = "{random values}"

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.384.03

FIRST VSAPI PATTERN DATE:

06 Sep 2012

VSAPI OPR PATTERN File:

9.385.00

VSAPI OPR PATTERN Date:

07 Sep 2012

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

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_CLASSES_ROOT\.key
    • (Default) = "regfile"
  • In HKEY_CLASSES_ROOT\CLSID\{random values}
    • (Default) = "{random string}"
  • In HKEY_CURRENT_USER\Software\ASProtect\SpecData
    • (Default) = "73C2167373C21673"
  • In HKEY_CURRENT_USER\Software\ASProtect\SpecData
    • 73C2167373C21673 = "{random values}"

Step 3

Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.BK. 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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