Backdoor.Win32.REMCOS.USMANEAGEK
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Backdoor 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
Arrival Details
This Backdoor 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 Backdoor adds the following processes:
- %User Temp%\74626076\koctxgte.pif smjhq.qvq
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It creates the following folders:
- %User Temp%\74626076
- %User Profile%\AppData
- %User Profile%\temp
- %Application Data%\remcos
- %System Root%\Users
- %Application Data%\Screenshots
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Other System Modifications
This Backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Remcos-VVJPTO
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
WindowsUpdate = "%User Temp%\74626076\koctxgte.pif %User Temp%\74626076\smjhq.qvq"
HKEY_CURRENT_USER\Software\Remcos-VVJPTO
exepath = "{random characters}"
HKEY_CURRENT_USER\Software\Remcos-VVJPTO
licence = "9C98D5D48F9EA32282C07700F23815A0"
Dropping Routine
This Backdoor drops the following files:
- %User Temp%\RegSvcs.exe
- %Application Data%\Screenshots\time_20190908_044227.png
- %Application Data%\Screenshots\time_20190908_045229.png
- %Application Data%\Screenshots\time_20190908_044027.png
- %User Temp%\74626076\bfiufn.docx
- %User Temp%\74626076\wdaccrl.xl
- %Application Data%\Screenshots\time_20190908_044728.png
- %User Temp%\74626076\ukpundgaf.mp3
- %Application Data%\Screenshots\time_20190908_044427.png
- %User Temp%\74626076\bguirb.icm
- %Application Data%\Screenshots\time_20190908_043827.png
- %User Temp%\74626076\dxpx.icm
- %Application Data%\Screenshots\time_20190908_044528.png
- %Application Data%\Screenshots\time_20190908_044127.png
- %Application Data%\Screenshots\time_20190908_044828.png
- %User Temp%\74626076\nwriuthh.xls
- %Application Data%\Screenshots\time_20190908_043526.png
- %User Temp%\74626076\dpwr.xls
- %Application Data%\Screenshots\time_20190908_043727.png
- %User Temp%\74626076\drveiwbaa.mp3
- %User Temp%\74626076\behukc.mp3
- %User Temp%\74626076\isselktguv.mp3
- %User Temp%\74626076\qkvdoto.ico
- %Application Data%\Screenshots\time_20190908_044327.png
- %Application Data%\Screenshots\time_20190908_043927.png
- %User Temp%\74626076\cndgbkdg.ico
- %User Temp%\74626076\tbdhiqoclf.ico
- %User Temp%\74626076\mses.xls
- %User Temp%\74626076\acrvjd.pdf
- %User Profile%\temp\qkvdoto.ico
- %User Temp%\74626076\iuiiih.cpl
- %Application Data%\Screenshots\time_20190908_043426.png
- %User Temp%\74626076\smjhq.qvq
- %Application Data%\Screenshots\time_20190908_043627.png
- %Application Data%\remcos\logs.dat
- %Application Data%\Screenshots\time_20190908_044928.png
- %User Temp%\74626076\mfxsdmq.ico
- %User Temp%\74626076\cplvne.dat
- %User Temp%\74626076\wvxtmpuxwj.ini
- %User Temp%\74626076\tktdwwr.docx
- %Application Data%\Screenshots\time_20190908_045028.png
- %Application Data%\Screenshots\time_20190908_045128.png
- %User Temp%\74626076\jlwtdpbwiv.xml
- %Application Data%\Screenshots\time_20190908_044628.png
- %User Temp%\74626076\utjdrecf.docx
- %User Temp%\74626076\koctxgte.pif
- %User Temp%\74626076\rowhdq.log
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Other Details
This Backdoor connects to the following possibly malicious URL:
- http://behco.{BLOCKED}s.org
- http://paris4real111.{BLOCKED}ee.com
This report is generated via an automated analysis system.
SOLUTION
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
Identify and terminate files detected as Backdoor.Win32.REMCOS.USMANEAGEK
- 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 3
Delete this registry key
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
- Remcos-VVJPTO
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\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
- WindowsUpdate = "%User Temp%\74626076\koctxgte.pif %User Temp%\74626076\smjhq.qvq"
- In HKEY_CURRENT_USER\Software\Remcos-VVJPTO
- exepath = "{random characters}"
- In HKEY_CURRENT_USER\Software\Remcos-VVJPTO
- licence = "9C98D5D48F9EA32282C07700F23815A0"
Step 5
Search and delete these components
- %User Temp%\RegSvcs.exe
- %Application Data%\Screenshots\time_20190908_044227.png
- %Application Data%\Screenshots\time_20190908_045229.png
- %Application Data%\Screenshots\time_20190908_044027.png
- %User Temp%\74626076\bfiufn.docx
- %User Temp%\74626076\wdaccrl.xl
- %Application Data%\Screenshots\time_20190908_044728.png
- %User Temp%\74626076\ukpundgaf.mp3
- %Application Data%\Screenshots\time_20190908_044427.png
- %User Temp%\74626076\bguirb.icm
- %Application Data%\Screenshots\time_20190908_043827.png
- %User Temp%\74626076\dxpx.icm
- %Application Data%\Screenshots\time_20190908_044528.png
- %Application Data%\Screenshots\time_20190908_044127.png
- %Application Data%\Screenshots\time_20190908_044828.png
- %User Temp%\74626076\nwriuthh.xls
- %Application Data%\Screenshots\time_20190908_043526.png
- %User Temp%\74626076\dpwr.xls
- %Application Data%\Screenshots\time_20190908_043727.png
- %User Temp%\74626076\drveiwbaa.mp3
- %User Temp%\74626076\behukc.mp3
- %User Temp%\74626076\isselktguv.mp3
- %User Temp%\74626076\qkvdoto.ico
- %Application Data%\Screenshots\time_20190908_044327.png
- %Application Data%\Screenshots\time_20190908_043927.png
- %User Temp%\74626076\cndgbkdg.ico
- %User Temp%\74626076\tbdhiqoclf.ico
- %User Temp%\74626076\mses.xls
- %User Temp%\74626076\acrvjd.pdf
- %User Profile%\temp\qkvdoto.ico
- %User Temp%\74626076\iuiiih.cpl
- %Application Data%\Screenshots\time_20190908_043426.png
- %User Temp%\74626076\smjhq.qvq
- %Application Data%\Screenshots\time_20190908_043627.png
- %Application Data%\remcos\logs.dat
- %Application Data%\Screenshots\time_20190908_044928.png
- %User Temp%\74626076\mfxsdmq.ico
- %User Temp%\74626076\cplvne.dat
- %User Temp%\74626076\wvxtmpuxwj.ini
- %User Temp%\74626076\tktdwwr.docx
- %Application Data%\Screenshots\time_20190908_045028.png
- %Application Data%\Screenshots\time_20190908_045128.png
- %User Temp%\74626076\jlwtdpbwiv.xml
- %Application Data%\Screenshots\time_20190908_044628.png
- %User Temp%\74626076\utjdrecf.docx
- %User Temp%\74626076\koctxgte.pif
- %User Temp%\74626076\rowhdq.log
Step 6
Search and delete these folders
- %User Temp%\74626076
- %User Profile%\AppData
- %User Profile%\temp
- %Application Data%\remcos
- %System Root%\Users
- %Application Data%\Screenshots
Step 7
Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.REMCOS.USMANEAGEK. 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:
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