remcos | e75a4696986efc34b686c88acbb183396fa22b765623d026c3d272be87c57650

Bypass User Account Control

T1548.002

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RTM09878GH.exe

Windows security bypass 2 TTPs 2 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	RTM09878GH.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\RTM09878GH.exe = "0"	RTM09878GH.exe

Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions	RTM09878GH.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4832	powershell.exe

Looks for VMWare Tools registry key 2 TTPs 1 IoCs

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	RTM09878GH.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	RTM09878GH.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	RTM09878GH.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	RTM09878GH.exe

Windows security modification 2 TTPs 3 IoCs

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths	RTM09878GH.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions	RTM09878GH.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Users\Admin\AppData\Local\Temp\RTM09878GH.exe = "0"	RTM09878GH.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	RTM09878GH.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RTM09878GH.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	RTM09878GH.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	RTM09878GH.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5092 set thread context of 1640	5092	RTM09878GH.exe	89

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4832	powershell.exe
4832	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4832	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1640	ilasm.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 5092 wrote to memory of 4832	5092	RTM09878GH.exe	85
PID 5092 wrote to memory of 4832	5092	RTM09878GH.exe	85
PID 5092 wrote to memory of 4844	5092	RTM09878GH.exe	87
PID 5092 wrote to memory of 4844	5092	RTM09878GH.exe	87
PID 5092 wrote to memory of 4844	5092	RTM09878GH.exe	87
PID 5092 wrote to memory of 4732	5092	RTM09878GH.exe	88
PID 5092 wrote to memory of 4732	5092	RTM09878GH.exe	88
PID 5092 wrote to memory of 4732	5092	RTM09878GH.exe	88
PID 5092 wrote to memory of 4732	5092	RTM09878GH.exe	88
PID 5092 wrote to memory of 4732	5092	RTM09878GH.exe	88
PID 5092 wrote to memory of 4732	5092	RTM09878GH.exe	88
PID 5092 wrote to memory of 4732	5092	RTM09878GH.exe	88
PID 5092 wrote to memory of 4732	5092	RTM09878GH.exe	88
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1640	5092	RTM09878GH.exe	89
PID 5092 wrote to memory of 1496	5092	RTM09878GH.exe	90
PID 5092 wrote to memory of 1496	5092	RTM09878GH.exe	90
PID 5092 wrote to memory of 1496	5092	RTM09878GH.exe	90

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	RTM09878GH.exe

C:\Users\Admin\AppData\Local\Temp\RTM09878GH.exe
"C:\Users\Admin\AppData\Local\Temp\RTM09878GH.exe"
1⤵
- UAC bypass
- Windows security bypass
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Windows security modification
- Checks whether UAC is enabled
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
- System policy modification
PID:5092
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\RTM09878GH.exe" -Force
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4832
- C:\Program Files (x86)\Internet Explorer\iexplore.exe
  "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
  2⤵
  PID:4844
- C:\Windows\System32\calc.exe
  "C:\Windows\System32\calc.exe"
  2⤵
  PID:4732
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe"
  2⤵
  - Suspicious use of SetWindowsHookEx
  PID:1640
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe"
  2⤵
  PID:1496

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry

Virtualization/Sandbox Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

System Information Discovery

Virtualization/Sandbox Evasion