remcos | 4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7

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

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	msupdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\msupdate.exe = "\"C:\\ProgramData\\Templates\\msupdate.exe\""	msupdate.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\msupdate.exe = "\"C:\\ProgramData\\Templates\\msupdate.exe\""	x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe

Deletes itself 1 IoCs

pid	Process
4440	WScript.exe

Executes dropped EXE 2 IoCs

pid	Process
2988	msupdate.exe
5432	msupdate.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-600123060-2148212387-2211176695-1000\Software\Microsoft\Windows\CurrentVersion\Run\msupdate.exe = "\"C:\\ProgramData\\Templates\\msupdate.exe\""	x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\msupdate.exe = "\"C:\\ProgramData\\Templates\\msupdate.exe\""	x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-600123060-2148212387-2211176695-1000\Software\Microsoft\Windows\CurrentVersion\Run\msupdate.exe = "\"C:\\ProgramData\\Templates\\msupdate.exe\""	msupdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\msupdate.exe = "\"C:\\ProgramData\\Templates\\msupdate.exe\""	msupdate.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2988 set thread context of 4700	2988	msupdate.exe	88

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 8 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	msupdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-600123060-2148212387-2211176695-1000_Classes\Local Settings	x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe

Modifies registry key 1 TTPs 2 IoCs

Modify Registry

pid	Process
4620	reg.exe
5044	reg.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2988	msupdate.exe
2988	msupdate.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2988	msupdate.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3712 wrote to memory of 2472	3712	x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe	79
PID 2472 wrote to memory of 4620	2472	cmd.exe	81
PID 3712 wrote to memory of 4440	3712	x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe	82
PID 2988 wrote to memory of 5348	2988	msupdate.exe	85
PID 2988 wrote to memory of 5352	2988	msupdate.exe	86
PID 2988 wrote to memory of 4700	2988	msupdate.exe	88
PID 5348 wrote to memory of 5044	5348	cmd.exe	89
PID 4440 wrote to memory of 5628	4440	WScript.exe	90
PID 5628 wrote to memory of 5432	5628	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe
"C:\Users\Admin\AppData\Local\Temp\x4a7a4f6998a35681d026c1b50e6c15e802312103271bfb3e75c7a7cbecb1f3f7.exe"
1⤵
- Adds policy Run key to start application
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:3712
- 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⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2472
- - 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
    - System Location Discovery: System Language Discovery
    - Modifies registry key
    PID:4620
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
  2⤵
  - Deletes itself
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4440
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Templates\msupdate.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:5628
  - - C:\ProgramData\Templates\msupdate.exe
      C:\ProgramData\Templates\msupdate.exe
      4⤵
      Executes dropped EXE
      PID:5432

C:\ProgramData\Templates\msupdate.exe
"C:\ProgramData\Templates\msupdate.exe"
1⤵
- Adds policy Run key to start application
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2988
- 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⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5348
- - 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
    - System Location Discovery: System Language Discovery
    - Modifies registry key
    PID:5044
- \??\c:\program files (x86)\microsoft\edge\application\msedge.exe
  "c:\program files (x86)\microsoft\edge\application\msedge.exe"
  2⤵
  PID:5352
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  PID:4700

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery