➔
search
✕

TROJ_WISP.WAD

October 26, 2014
 Analysis by: RonJay Kristoffer Caragay
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It arrives as a component bundled with malware/grayware packages.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not drop any other file.

It does not have any downloading capability.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

4,608 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Oct 2014

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It arrives as a component bundled with malware/grayware packages.

Installation

This Trojan adds the following processes:

  • IEXPLORER.EXE

Its DLL component is injected to the following process(es):

  • created IEXPLORER.EXE

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
msconfig = "{malware path and file name} -startup"

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan does not drop any other file.

Download Routine

This Trojan does not have any downloading capability.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan requires the following additional components to properly run:

  • %User Profile%\Local Settings\lz32.dll (For Windows below Vista) ← detected as BKDR_WISP.DUK
  • %AppDataLocal%\lz32.dll (For Windows Vista and above) ← detected as BKDR_WISP.DUK

(Note: %User Profile% is a user's profile folder, where it usually is C:\Documents and Settings\{user name} on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name} on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

NOTES:

It needs the following parameter to perform its main routine:

  • -startup

If it was executed without the said parameter it will then checks for the existence of the following registry entry:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
start = "{malware path and file name} -startup"

If this registry entries does not exist, it will create its own auto-start registry then exit.

It will load the following file into the created process IEXPLORER.EXE:

  • %AppDataLocal%\lz32.dll (For Windows Vista and above)
  • %User Profile%\Local Settings\lz32.dll (For Windows below Vista)

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.198.03

FIRST VSAPI PATTERN DATE:

08 Oct 2014

VSAPI OPR PATTERN File:

11.199.00

VSAPI OPR PATTERN Date:

09 Oct 2014

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove the malware/grayware file dropped/downloaded by TROJ_WISP.WAD. (Note: Please skip this step if the threat(s) listed below have already been removed.)

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • msconfig = {malware path and file name} -startup
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • start = {malware path and file name} -startup

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_WISP.WAD. 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.


Did this description help? Tell us how we did.