Backdoor.AutoIt.REMCOS.USMANEAGDC
Backdoor.Win32.Remcos.jef (Kaspersky); Trojan.TR/AD.Remcos.yntfd (F-Secure); Win32.Backdoor.Remcos.Egyh (Tencent)
Windows
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
1,231,360 bytes
EXE
No
25 Sep 2019
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 drops the following files:
- %System Root%\{Computer Name}\TieringEngineService\GameBarPresenceWriter.exe
- %User Startup%\TieringEngineService.lnk
- %Application Data%\remcos\logs.dat
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 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).)
It creates the following folders:
- %System Root%\{Computer Name}
- %System Root%\{Computer Name}\TieringEngineService
- %Application Data%\remcos
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %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 System Modifications
This Backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Remcos-{Random String}
exepath = ""
HKEY_CURRENT_USER\Software\Remcos-{Random String}
licence = ""
HKEY_CURRENT_USER\Software
Remcos-{Random String} = ""
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Remcos-{Random String}
exepath = {Encrypted Data}
HKEY_CURRENT_USER\Software\Remcos-{Random String}
licence = {GUID}
SOLUTION
9.850
15.392.04
26 Sep 2019
15.393.00
27 Sep 2019
Step 1
Trend Micro products with the XGen technology detect this malware as
Step 2
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 3
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 4
Identify and terminate files detected as Backdoor.AutoIt.REMCOS.USMANEAGDC
- 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 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\Remcos-{Random String}
- exepath = {Encrypted Data}
- exepath = {Encrypted Data}
- In HKEY_CURRENT_USER\Software\Remcos-{Random String}
- licence = {GUID}
- licence = {GUID}
Step 6
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-{Random String} = ""
- Remcos-{Random String} = ""
Step 7
Search and delete this file
- %System Root%\{Computer Name}\TieringEngineService\GameBarPresenceWriter.exe
- %User Startup%\TieringEngineService.lnk
- %Application Data%\remcos\logs.dat
Step 8
Search and delete these folders
- %System Root%\{Computer Name}\TieringEngineService
- %System Root%\{Computer Name}
- %Application Data%\remcos
Step 9
Scan your computer with your Trend Micro product to delete files detected as Backdoor.AutoIt.REMCOS.USMANEAGDC. 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.