TROJ_WISP.WAD
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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
4,608 bytes
EXE
No
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
9.700
11.198.03
08 Oct 2014
11.199.00
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
Step 5
Delete this registry value
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.
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