remcos | 8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71

Modify Registry

Processes:

8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exeJavaUpdate.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\JavaUpdater\\JavaUpdate.exe\""	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Users\\Admin\\AppData\\Roaming\\JavaUpdater\\JavaUpdate.exe\""	JavaUpdate.exe

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

UAC bypass 3 TTPs 2 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

reg.exereg.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	reg.exe

detects Windows exceutables potentially bypassing UAC using eventvwr.exe 2 IoCs

Processes:

resource	yara_rule
\Users\Admin\AppData\Roaming\JavaUpdater\JavaUpdate.exe	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer
behavioral1/memory/2660-17-0x0000000000400000-0x0000000000419000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_UACBypass_EventViewer

Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1808 cmd.exe
Executes dropped EXE 1 IoCs

Processes:

JavaUpdate.exe

pid process

2928 JavaUpdate.exe
Loads dropped DLL 4 IoCs

Processes:

cmd.exeJavaUpdate.exe

pid process

1808 cmd.exe
2928 JavaUpdate.exe
2928 JavaUpdate.exe
2928 JavaUpdate.exe

pid	process
1808	cmd.exe

pid	process
2928	JavaUpdate.exe

pid	process
1808	cmd.exe
2928	JavaUpdate.exe
2928	JavaUpdate.exe
2928	JavaUpdate.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exeJavaUpdate.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2461186416-2307104501-1787948496-1000\Software\Microsoft\Windows\CurrentVersion\Run\Java Updater = "\"C:\\Users\\Admin\\AppData\\Roaming\\JavaUpdater\\JavaUpdate.exe\""	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2461186416-2307104501-1787948496-1000\Software\Microsoft\Windows\CurrentVersion\Run\Java Updater = "\"C:\\Users\\Admin\\AppData\\Roaming\\JavaUpdater\\JavaUpdate.exe\""	JavaUpdate.exe

Modifies WinLogon 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

Modify Registry

Processes:

8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exeJavaUpdate.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe
Key created	\REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\	JavaUpdate.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

JavaUpdate.exe

description pid process target process

PID 2928 set thread context of 2660 2928 JavaUpdate.exe iexplore.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Modifies registry key 1 TTPs 2 IoCs

Modify Registry
T1112

Processes:

reg.exereg.exe

pid process

1792 reg.exe
2580 reg.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

2132 PING.EXE
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

JavaUpdate.exe

description pid process

Token: SeRestorePrivilege 2928 JavaUpdate.exe
Token: SeBackupPrivilege 2928 JavaUpdate.exe

description	pid	process	target process
PID 2928 set thread context of 2660	2928	JavaUpdate.exe	iexplore.exe

pid	process
1792	reg.exe
2580	reg.exe

pid	process
2132	PING.EXE

description	pid	process
Token: SeRestorePrivilege	2928	JavaUpdate.exe
Token: SeBackupPrivilege	2928	JavaUpdate.exe

Suspicious use of WriteProcessMemory 54 IoCs

Processes:

8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.execmd.execmd.exeJavaUpdate.execmd.exe

description	pid	process	target process
PID 2056 wrote to memory of 1800	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1800	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1800	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1800	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 1800 wrote to memory of 1792	1800	cmd.exe	reg.exe
PID 1800 wrote to memory of 1792	1800	cmd.exe	reg.exe
PID 1800 wrote to memory of 1792	1800	cmd.exe	reg.exe
PID 1800 wrote to memory of 1792	1800	cmd.exe	reg.exe
PID 2056 wrote to memory of 1808	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1808	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1808	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1808	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1808	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1808	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 2056 wrote to memory of 1808	2056	8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe	cmd.exe
PID 1808 wrote to memory of 2132	1808	cmd.exe	PING.EXE
PID 1808 wrote to memory of 2132	1808	cmd.exe	PING.EXE
PID 1808 wrote to memory of 2132	1808	cmd.exe	PING.EXE
PID 1808 wrote to memory of 2132	1808	cmd.exe	PING.EXE
PID 1808 wrote to memory of 2928	1808	cmd.exe	JavaUpdate.exe
PID 1808 wrote to memory of 2928	1808	cmd.exe	JavaUpdate.exe
PID 1808 wrote to memory of 2928	1808	cmd.exe	JavaUpdate.exe
PID 1808 wrote to memory of 2928	1808	cmd.exe	JavaUpdate.exe
PID 1808 wrote to memory of 2928	1808	cmd.exe	JavaUpdate.exe
PID 1808 wrote to memory of 2928	1808	cmd.exe	JavaUpdate.exe
PID 1808 wrote to memory of 2928	1808	cmd.exe	JavaUpdate.exe
PID 2928 wrote to memory of 2644	2928	JavaUpdate.exe	cmd.exe
PID 2928 wrote to memory of 2644	2928	JavaUpdate.exe	cmd.exe
PID 2928 wrote to memory of 2644	2928	JavaUpdate.exe	cmd.exe
PID 2928 wrote to memory of 2644	2928	JavaUpdate.exe	cmd.exe
PID 2928 wrote to memory of 2644	2928	JavaUpdate.exe	cmd.exe
PID 2928 wrote to memory of 2644	2928	JavaUpdate.exe	cmd.exe
PID 2928 wrote to memory of 2644	2928	JavaUpdate.exe	cmd.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2928 wrote to memory of 2660	2928	JavaUpdate.exe	iexplore.exe
PID 2644 wrote to memory of 2580	2644	cmd.exe	reg.exe
PID 2644 wrote to memory of 2580	2644	cmd.exe	reg.exe
PID 2644 wrote to memory of 2580	2644	cmd.exe	reg.exe
PID 2644 wrote to memory of 2580	2644	cmd.exe	reg.exe
PID 2644 wrote to memory of 2580	2644	cmd.exe	reg.exe
PID 2644 wrote to memory of 2580	2644	cmd.exe	reg.exe
PID 2644 wrote to memory of 2580	2644	cmd.exe	reg.exe

C:\Users\Admin\AppData\Local\Temp\8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe
"C:\Users\Admin\AppData\Local\Temp\8bebd7cc515650c4af50bf56987bbc5959b742647333be47b810f2c7442eac71.exe"
1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Modifies WinLogon
- Suspicious use of WriteProcessMemory
PID:2056

C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
2⤵
- Suspicious use of WriteProcessMemory
PID:1800

C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
3⤵
- UAC bypass
- Modifies registry key
PID:1792

C:\Windows\SysWOW64\cmd.exe
cmd /c ""C:\Users\Admin\AppData\Local\Temp\install.bat" "
2⤵
- Deletes itself
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1808

C:\Windows\SysWOW64\PING.EXE
PING 127.0.0.1 -n 2
3⤵
- Runs ping.exe
PID:2132

C:\Users\Admin\AppData\Roaming\JavaUpdater\JavaUpdate.exe
"C:\Users\Admin\AppData\Roaming\JavaUpdater\JavaUpdate.exe"
3⤵
- Modifies WinLogon for persistence
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Modifies WinLogon
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2928

C:\Windows\SysWOW64\cmd.exe
/k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
4⤵
- Suspicious use of WriteProcessMemory
PID:2644

C:\Windows\SysWOW64\reg.exe
C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
5⤵
- UAC bypass
- Modifies registry key
PID:2580

C:\Program Files (x86)\Internet Explorer\iexplore.exe
"C:\Program Files (x86)\Internet Explorer\iexplore.exe"
4⤵
PID:2660

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

2

Privilege Escalation

Boot or Logon Autostart Execution

3

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

2

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Modify Registry

5

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Credential Access

Discovery

System Information Discovery

T1082

Remote System Discovery