remcos | 4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991

Windows Service

Disable or Modify Tools

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\DisableAntiSpyware = "1"	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\DisableAntiSpyware = "1"	iQEEJsF.exe

Modifies Windows Defender Real-time Protection settings 3 TTPs 7 IoCs

defense_evasion trojan

Modify Registry

Windows Service

Disable or Modify Tools

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	iQEEJsF.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	iQEEJsF.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	iQEEJsF.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe

Modifies Windows Defender TamperProtection settings 3 TTPs 2 IoCs

evasion trojan

Modify Registry

Windows Service

Disable or Modify Tools

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	iQEEJsF.exe

ReZer0 packer 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

resource	yara_rule
behavioral30/memory/1848-7-0x0000000007360000-0x000000000738E000-memory.dmp	rezer0

Checks computer location settings 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	iQEEJsF.exe

Executes dropped EXE 2 IoCs

pid	Process
3924	iQEEJsF.exe
4252	iQEEJsF.exe

Windows security modification 2 TTPs 3 IoCs

defense_evasion trojan

Disable or Modify Tools

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	iQEEJsF.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1848 set thread context of 4196	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	88
PID 3924 set thread context of 4252	3924	iQEEJsF.exe	95

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 7 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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iQEEJsF.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
4732	schtasks.exe
3184	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2852	powershell.exe
2852	powershell.exe
2700	powershell.exe
2700	powershell.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4196	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2852	powershell.exe
Token: SeDebugPrivilege	2700	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4196	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 1848 wrote to memory of 2852	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	84
PID 1848 wrote to memory of 4732	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	86
PID 1848 wrote to memory of 4196	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	88
PID 1848 wrote to memory of 4196	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	88
PID 1848 wrote to memory of 4196	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	88
PID 1848 wrote to memory of 4196	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	88
PID 1848 wrote to memory of 4196	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	88
PID 1848 wrote to memory of 4196	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	88
PID 1848 wrote to memory of 4196	1848	4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe	88
PID 3924 wrote to memory of 2700	3924	iQEEJsF.exe	91
PID 3924 wrote to memory of 3184	3924	iQEEJsF.exe	93
PID 3924 wrote to memory of 4252	3924	iQEEJsF.exe	95
PID 3924 wrote to memory of 4252	3924	iQEEJsF.exe	95
PID 3924 wrote to memory of 4252	3924	iQEEJsF.exe	95
PID 3924 wrote to memory of 4252	3924	iQEEJsF.exe	95
PID 3924 wrote to memory of 4252	3924	iQEEJsF.exe	95
PID 3924 wrote to memory of 4252	3924	iQEEJsF.exe	95
PID 3924 wrote to memory of 4252	3924	iQEEJsF.exe	95

C:\Users\Admin\AppData\Local\Temp\4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
"C:\Users\Admin\AppData\Local\Temp\4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe"
1⤵
- Modifies Windows Defender DisableAntiSpyware settings
- Modifies Windows Defender Real-time Protection settings
- Modifies Windows Defender TamperProtection settings
- Checks computer location settings
- Windows security modification
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1848
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2852
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\iQEEJsF" /XML "C:\Users\Admin\AppData\Local\Temp\tmp84EA.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:4732
- C:\Users\Admin\AppData\Local\Temp\4d269e29e4a96282e8d332bedffabf195931e18c4dd54ee23bcf044daf1c7991.exe
  "{path}"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  PID:4196

C:\Users\Admin\AppData\Roaming\iQEEJsF.exe
C:\Users\Admin\AppData\Roaming\iQEEJsF.exe
1⤵
- Modifies Windows Defender DisableAntiSpyware settings
- Modifies Windows Defender Real-time Protection settings
- Modifies Windows Defender TamperProtection settings
- Checks computer location settings
- Executes dropped EXE
- Windows security modification
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3924
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2700
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\iQEEJsF" /XML "C:\Users\Admin\AppData\Local\Temp\tmp92D5.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:3184
- C:\Users\Admin\AppData\Roaming\iQEEJsF.exe
  "{path}"
  2⤵
  - Executes dropped EXE
  PID:4252

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Create or Modify System Process

T1543

Windows Service

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry