ec47184e810be9dda3a85a4ccd42abfffe818b49bd2262774991fec10604dcff

Reason

Machine shutdown

General

Target
chthonic_2.23.21.2.vir.exe
Size 987KB
Sample200719-ph45xycwan
SHA256 ec47184e810be9dda3a85a4ccd42abfffe818b49bd2262774991fec10604dcff
MD5 d8adacb5999a4f749cbd433067ba4afa
SHA1 dcc5632ebdf87c68c5eb52f193651385022a5bdf
SHA512 e9dd5b39726369b67fcd6ee8ff44ee3ef2dee2ce63e2ee54d098a1c55f5c4688483526ab4f0ce384e6f0d75bacecb38c4b0d86ea7c58a39374f2403aae3e2255
MD5 SHA1 SHA512

Score

8^/10

persistence ransomware bootkit

Malware Config

Signatures

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2720	chthonic_2.23.21.2.vir.exe
3588	LogonUI.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2720	chthonic_2.23.21.2.vir.exe

Loads dropped DLL 6 IoCs

pid	Process
2720	chthonic_2.23.21.2.vir.exe
2720	chthonic_2.23.21.2.vir.exe
2720	chthonic_2.23.21.2.vir.exe
2720	chthonic_2.23.21.2.vir.exe
2720	chthonic_2.23.21.2.vir.exe
2720	chthonic_2.23.21.2.vir.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\	chthonic_2.23.21.2.vir.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2066881839-3229799743-3576549721-1000\software\microsoft\windows\currentversion\RunOnce	chthonic_2.23.21.2.vir.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2066881839-3229799743-3576549721-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\AdobeC = "C:\\Users\\Admin\\AppData\\Roaming\\AdobeC\\AdobeC.exe"	chthonic_2.23.21.2.vir.exe

Modifies WinLogon to allow AutoLogon 2 TTPs 1 IoCs

Enables rebooting of the machine without requiring login credentials.

ransomware bootkit

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked	LogonUI.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2720	chthonic_2.23.21.2.vir.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2720	chthonic_2.23.21.2.vir.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeShutdownPrivilege	2720	chthonic_2.23.21.2.vir.exe
Token: SeBackupPrivilege	2720	chthonic_2.23.21.2.vir.exe
Token: SeRestorePrivilege	2720	chthonic_2.23.21.2.vir.exe
Token: SeShutdownPrivilege	2720	chthonic_2.23.21.2.vir.exe
Token: SeShutdownPrivilege	2720	chthonic_2.23.21.2.vir.exe
Token: SeShutdownPrivilege	2720	chthonic_2.23.21.2.vir.exe

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe

C:\Users\Admin\AppData\Local\Temp\chthonic_2.23.21.2.vir.exe
"C:\Users\Admin\AppData\Local\Temp\chthonic_2.23.21.2.vir.exe"
1⤵
- Suspicious use of SetWindowsHookEx
- Suspicious use of SendNotifyMessage
- Loads dropped DLL
- Drops file in Windows directory
- Adds Run key to start application
- Suspicious use of FindShellTrayWindow
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:2720

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x0 /state0:0xa3ace855 /state1:0x41c64e6d
1⤵
- Suspicious use of SetWindowsHookEx
- Modifies WinLogon to allow AutoLogon
- Modifies data under HKEY_USERS
PID:3588

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

Winlogon Helper DLL

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads