Analysis by: Rhena Inocencio
ALIASES:

PWS:Win32/Zbot (Microsoft)

 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:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 367,564 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 19 Apr 2013
Payload: Drops files

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.

It may be downloaded from the following remote sites:

  • http://{BLOCKED}rejustin.org:443/web/default.php

Installation

This spyware drops the following files:

  • %User Temp%\{computer name}{number}\setup.exe
  • %User Temp%\{computer name}{number}\update.vbs

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

Dropping Routine

This spyware drops the following files:

  • %User Temp%\{computer name}{number}\file.exe - detected as TSPY_ZBOT.VUS

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

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Other Details

This spyware requires the following additional components to properly run:

  • update.vbs

NOTES:

This malware arrives as a password-protected archive.

It can only be executed using the password 3qizfJso40,Se8Nchw2.A

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 8.790.04
FIRST VSAPI PATTERN DATE: 21 Feb 2012
VSAPI OPR PATTERN File: 8.791.00
VSAPI OPR PATTERN Date: 22 Feb 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

Remove malware/grayware files dropped/downloaded by TSPY_ZBOT.DL

    • TSPY_ZBOT.VUS

Step 3

Search and delete these files

[ 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.  
  • %User Temp%\{computer name}{number}\setup.exe
  • %User Temp%\{computer name}{number}\update.vbs

Step 4

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