Analysis by: Christopher Daniel So
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: Yes

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component. It may be downloaded by other malware/grayware/spyware from remote sites.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 182,272 bytes
File Type: PE
Memory Resident: No
Initial Samples Received Date: 12 Aug 2010

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It may be downloaded by other malware/grayware/spyware from remote sites.

Installation

This Trojan drops and executes the following files:

  • %User Profile%\Application Data\{Random folder name}\{Random file name}.exe - detected as TROJ_KRAP.SMDA

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It decrypts, loads and executes a malware in memory - detected as Mal_Zbot-8

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI PATTERN File: 7.378.02
VSAPI PATTERN Date: 12 Aug 2010
VSAPI PATTERN Date: 8/12/2010 12:00:00 AM

Step 1

Remove malware files dropped/downloaded by TROJ_ZBOT.KRP

    Mal_Zbot-8
    TROJ_KRAP.SMDA

Step 2

Scan your computer with your Trend Micro product to delete files detected as TROJ_ZBOT.KRP. 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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