Worm.Win64.FAUXPERSKY.AA
Trojan.SuspectCRC (Ikarus)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This Worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It modifies certain registry entries to hide Hidden files.
TECHNICAL DETAILS
1,081,344 bytes
EXE
Yes
17 Feb 2023
Drops files, Modifies system registry
Arrival Details
This Worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This Worm drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\taskmngr.lnk -> %AppData%\Kaspersky PURE v3.0\spoolsvc.exe detected as Worm.Win64.FAUXPERSKY.AA
- %User Startup%\svhost.lnk -> executes %AppData%\Kaspersky PURE v3.0\svhost.exe detected as TrojanSpy.Win64.FAUXPERSKY.AB
- %User Startup%\spoolsvc.lnk -> executes %AppData%\Kaspersky PURE v3.0\spoolsvc.exe detected as TrojanSpy.Win32.FAUXPERSKY.AA
Propagation
This Worm creates the following folders in all removable drives:
- {Removable drive}:\Kaspersky PURE v3.0
- {Removable drive}:\Kaspersky PURE v3.0\Vault
- {Removable drive}:\Kaspersky PURE v3.0\System
- All created folders have Read-Only, System, and Hidden attributes
Other Details
This Worm modifies the following registry entries to hide Hidden files:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = 2
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 0
(Note: The default value data of the said registry entry is 1.)
It does the following:
- It copies the following files if they don't exist in the created folder yet ({Removable drive}:\Kaspersky PURE v3.0\System):
- Files with .exe extension in %AppData%\Kaspersky PURE v3.0
- It drops the following file in removable drives:
- {Removable drive}:\{label of removable drive} ({size of removable drive}).lnk -> executes {Removable drive}:\Kaspersky PURE v3.0\System\winlogin.exe detected as TrojanSpy.Win32.FAUXPERSKY.AB
- It sleeps for 5 seconds before proceeding with its routines. It repeats this cycle infinitely.
SOLUTION
9.800
18.262.08
17 Feb 2023
18.263.00
18 Feb 2023
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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
Restart in Safe Mode
Step 4
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- Hidden = 2
- Hidden = 2
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = 0
- ShowSuperHidden = 0
Step 5
Search and delete these files
- %User Startup%\taskmngr.lnk
- %User Startup%\svhost.lnk
- %User Startup%\spoolsvc.lnk
- {Removable drive}:\{label of removable drive} ({size of removable drive}).lnk
Step 6
Search and delete these folders
- {Removable drive}:\Kaspersky PURE v3.0
- {Removable drive}:\Kaspersky PURE v3.0\Vault
- {Removable drive}:\Kaspersky PURE v3.0\System
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Worm.Win64.FAUXPERSKY.AA. 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.