WORM_FAKEDOC_FD050240.UVPM
Worm:Win32/Fadok!rfn (Microsoft); GenericRXAH-AG!B646D6CDE92D (McAfee); SMG.Heur!gen (Symantec); Trojan.Win32.Agent.ifdx (Kaspersky); Troj/Agent-AUKJ (Sophos); Trojan.Win32.Generic!BT (Sunbelt)
Windows
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
1,626,112 bytes
EXE
Yes
15 Jan 2020
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.
Installation
This Worm adds the following processes:
- %Application Data%\RAC\svcsc.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It creates the following folders:
- %Application Data%\RAC
- F:\data
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Autostart Technique
This Worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
mls = "%Application Data%\RAC\mls.exe -s"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
svcsc.exe = "%Application Data%\RAC\svcsc.exe"
Dropping Routine
This Worm drops the following files:
- %Application Data%\RAC\svcsc.exe.config
- %Application Data%\RAC\svcsc.exe.config.tmp
- F:\data\tmp.exe
- %Application Data%\RAC\svcsc.exe.tmp
- %Application Data%\RAC\svcsc.exe
- %Application Data%\RAC\mls.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Other Details
This Worm connects to the following possibly malicious URL:
- http://{BLOCKED}ytics.ru/net.exe.config
This report is generated via an automated analysis system.
SOLUTION
9.850
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
Restart in Safe Mode
Step 3
Identify and terminate files detected as WORM_FAKEDOC_FD050240.UVPM
- 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- mls = "%Application Data%\RAC\mls.exe -s"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- svcsc.exe = "%Application Data%\RAC\svcsc.exe"
Step 5
Search and delete these components
- %Application Data%\RAC\svcsc.exe.config
- %Application Data%\RAC\svcsc.exe.config.tmp
- F:\data\tmp.exe
- %Application Data%\RAC\svcsc.exe.tmp
- %Application Data%\RAC\svcsc.exe
- %Application Data%\RAC\mls.exe
Step 6
Search and delete these folders
- %Application Data%\RAC
- F:\data
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_FAKEDOC_FD050240.UVPM. 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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