ebbb8769086dcf3f7bdaf9366cf6a5ac4c5ac981e4be3c69d08ce06fc80c2f28

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, FreeWill.exe"	FreeWill.exe

Modifies Windows Defender DisableAntiSpyware settings 3 TTPs 1 IoCs

evasion trojan

Modify Registry

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

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

UAC bypass 3 TTPs 1 IoCs

defense_evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

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

Renames multiple (1003) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

Disables RegEdit via registry modification 1 IoCs

defense_evasion

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	FreeWill.exe

Disables Task Manager via registry modification
defense_evasion

Possible privilege escalation attempt 4 IoCs

exploit

pid	Process
2280	takeown.exe
1120	icacls.exe
4836	icacls.exe
224	takeown.exe

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\International\Geo\Nation	FreeWill.exe

Credentials from Password Stores: Windows Credential Manager 1 TTPs
Suspicious access to Credentials History.
credential_access stealer

Windows Credential Manager
T1555.004

Modifies file permissions 1 TTPs 4 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
224	takeown.exe
2280	takeown.exe
1120	icacls.exe
4836	icacls.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Windows security modification 2 TTPs 2 IoCs

defense_evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Real-Time Protection	FreeWill.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Real-Time Protection\DisableRealtimeMonitoring = "1"	FreeWill.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

defense_evasion trojan

System Information Discovery

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

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\system32\WindowsUpdateService.exe	FreeWill.exe
File opened for modification	C:\Windows\system32\WindowsUpdateService.exe	FreeWill.exe
File created	C:\Windows\system32\LogonUITrue.exe	FreeWill.exe
File opened for modification	C:\Windows\system32\LogonUITrue.exe	FreeWill.exe
File created	C:\Windows\system32\LogonUI.exe	FreeWill.exe
File created	C:\Windows\system32\FreeWill.exe	FreeWill.exe
File opened for modification	C:\Windows\system32\FreeWill.exe	FreeWill.exe

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-869607583-2483572573-2297019986-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\FreeWill_img.png"	FreeWill.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\FreeWill.exe	FreeWill.exe
File opened for modification	C:\Windows\FreeWill.exe	FreeWill.exe
File created	C:\Windows\bootfcg.dat	FreeWill.exe
File opened for modification	C:\Windows\bootfcg.dat	FreeWill.exe

Browser Information Discovery 1 TTPs
Enumerate browser information.
discovery

Browser Information Discovery
T1217
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS	FreeWill.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemManufacturer	FreeWill.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemVersion	FreeWill.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeTakeOwnershipPrivilege	224	takeown.exe
Token: SeTakeOwnershipPrivilege	2280	takeown.exe
Token: 33	5028	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	5028	AUDIODG.EXE

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2484	FreeWill.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 2484 wrote to memory of 4700	2484	FreeWill.exe	97
PID 2484 wrote to memory of 4700	2484	FreeWill.exe	97
PID 4700 wrote to memory of 224	4700	cmd.exe	99
PID 4700 wrote to memory of 224	4700	cmd.exe	99
PID 2484 wrote to memory of 3404	2484	FreeWill.exe	100
PID 2484 wrote to memory of 3404	2484	FreeWill.exe	100
PID 3404 wrote to memory of 2280	3404	cmd.exe	102
PID 3404 wrote to memory of 2280	3404	cmd.exe	102
PID 2484 wrote to memory of 5116	2484	FreeWill.exe	103
PID 2484 wrote to memory of 5116	2484	FreeWill.exe	103
PID 5116 wrote to memory of 1120	5116	cmd.exe	105
PID 5116 wrote to memory of 1120	5116	cmd.exe	105
PID 2484 wrote to memory of 4608	2484	FreeWill.exe	108
PID 2484 wrote to memory of 4608	2484	FreeWill.exe	108
PID 4608 wrote to memory of 4836	4608	cmd.exe	110
PID 4608 wrote to memory of 4836	4608	cmd.exe	110

System policy modification 1 TTPs 1 IoCs

defense_evasion

Modify Registry

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

C:\Users\Admin\AppData\Local\Temp\FreeWill.exe
"C:\Users\Admin\AppData\Local\Temp\FreeWill.exe"
1⤵
- Modifies WinLogon for persistence
- Modifies Windows Defender DisableAntiSpyware settings
- UAC bypass
- Disables RegEdit via registry modification
- Checks computer location settings
- Windows security modification
- Checks whether UAC is enabled
- Drops file in System32 directory
- Sets desktop wallpaper using registry
- Drops file in Windows directory
- Enumerates system info in registry
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2484
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c takeown /f C:\Windows\system32 /a
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4700
- - C:\Windows\system32\takeown.exe
    takeown /f C:\Windows\system32 /a
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:224
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c takeown /f C:\Windows\system32\LogonUI.exe /a
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3404
- - C:\Windows\system32\takeown.exe
    takeown /f C:\Windows\system32\LogonUI.exe /a
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:2280
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c icacls C:\Windows\system32 /grant %username%:F
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5116
- - C:\Windows\system32\icacls.exe
    icacls C:\Windows\system32 /grant Admin:F
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:1120
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c icacls C:\Windows\system32\LogonUI.exe /grant %username%:F
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4608
- - C:\Windows\system32\icacls.exe
    icacls C:\Windows\system32\LogonUI.exe /grant Admin:F
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:4836

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x3f4 0x3f8
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5028

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

File and Directory Permissions Modification

T1222

Impair Defenses

3

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Credentials from Password Stores

2

T1555

Credentials from Web Browsers

T1555.003

Windows Credential Manager

T1555.004

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Browser Information Discovery

Query Registry

System Information Discovery

4

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Defacement