ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft); PWS-FCCA!5863BCC5AD05 (McAfee); Trojan-Spy.Win32.Zbot.lmv (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Zbot.ACJD (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 267,776 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 06 Jun 2015

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 keys:

HKEY_CURRENT_USER\Software\Microsoft\
Koad

HKEY_CURRENT_USER\Software\Microsoft\
Guidy

HKEY_CURRENT_USER\Software\Microsoft\
Yvitix

HKEY_CURRENT_USER\Software\Microsoft\
Ceimh

Dropping Routine

This spyware drops the following files:

  • %User Profile%\My\Launch Internet Explorer Browser.ygl
  • %User Profile%\My\Launch Internet Explorer Browser.eby
  • %User Profile%\My\Launch Internet Explorer Browser.exe

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

Other Details

This spyware deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.750

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 key

[ 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_CURRENT_USER\Software\Microsoft
    • Koad
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Guidy
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Yvitix
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Ceimh

Step 3

Search and delete these components

[ Learn More ]
There may be some components 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 Profile%\My\Launch Internet Explorer Browser.ygl
  • %User Profile%\My\Launch Internet Explorer Browser.eby
  • %User Profile%\My\Launch Internet Explorer Browser.exe

Step 4

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