WORM_FAKEFLDR.AI
Worm.Win32.FakeFolder.a (Kaspersky), Trojan.Generic.6048691 (Bitdefender), Worm/Pakes.BXQ (AVG)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
48,640 bytes
EXE
No
Arrival Details
This Worm arrives via removable drives.
It 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 creates the following registry entries to enable automatic execution of dropped component at every system startup:
HKLM\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
(Default) = %Program Files%\system.caca
Other System Modifications
This Worm adds the following registry keys:
HKLM\SOFTWARE\Classes\
cacafile
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.caca
It adds the following registry entries:
HKLM\SOFTWARE\Classes\
.caca
(Default) = cacafile
HKLM\SOFTWARE\Classes\
cacafile\shell\open\
command
(Default) = C:\Program Files\Internet Explorer\WINLOGON.exe
Propagation
This Worm drops the following copy(ies) of itself in all removable drives:
- {removable drive letter}:\MyDocument.exe
Dropping Routine
This Worm drops the following files:
- %Program Files%\Internet Explorer\WINLOGON.exe
- %Program Files%\system.caca
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)
Other Details
This Worm does the following:
- It moves the files from the root directory of removable drives to the created folder {removable drive}\MyDocuments
SOLUTION
9.850
13.674.05
22 Sep 2017
13.675.00
23 Sep 2017
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
Identify and terminate files detected as WORM_FAKEFLDR.AI
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- (Default) = "%Program Files%\system.caca"
- (Default) = "%Program Files%\system.caca"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\cacafile\shell\open\command
- (Default) = "C:\Program Files\Internet Explorer\WINLOGON.exe"
- (Default) = "C:\Program Files\Internet Explorer\WINLOGON.exe"
Step 5
Search and delete these files
- %Program Files%\Internet Explorer\WINLOGON.exe
- %Program Files%\system.caca
- {removable drive letter}:\MyDocument.exe
Step 6
Scan your computer with your Trend Micro product to delete files detected as WORM_FAKEFLDR.AI. 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 the following Trend Micro Support pages for more information:
Did this description help? Tell us how we did.