ec47184e810be9dda3a85a4ccd42abfffe818b49bd2262774991fec10604dcff

Reason

Machine shutdown

General

Target

chthonic_2.23.21.2.vir.exe
Size

987KB
MD5

d8adacb5999a4f749cbd433067ba4afa
SHA1

dcc5632ebdf87c68c5eb52f193651385022a5bdf
SHA256

ec47184e810be9dda3a85a4ccd42abfffe818b49bd2262774991fec10604dcff
SHA512

e9dd5b39726369b67fcd6ee8ff44ee3ef2dee2ce63e2ee54d098a1c55f5c4688483526ab4f0ce384e6f0d75bacecb38c4b0d86ea7c58a39374f2403aae3e2255

Score

8^/10

persistence ransomware bootkit

Malware Config

Signatures

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

chthonic_2.23.21.2.vir.exeLogonUI.exe

pid process

2720 chthonic_2.23.21.2.vir.exe
3588 LogonUI.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

chthonic_2.23.21.2.vir.exe

pid process

2720 chthonic_2.23.21.2.vir.exe

Loads dropped DLL 6 IoCs

Processes:

chthonic_2.23.21.2.vir.exe

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

Processes:

chthonic_2.23.21.2.vir.exe

description ioc process

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

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

Processes:

chthonic_2.23.21.2.vir.exe

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

Processes:

LogonUI.exe

description ioc process

Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoLogonChecked LogonUI.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

chthonic_2.23.21.2.vir.exe

pid process

2720 chthonic_2.23.21.2.vir.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

chthonic_2.23.21.2.vir.exe

pid process

2720 chthonic_2.23.21.2.vir.exe

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

Suspicious use of AdjustPrivilegeToken 6 IoCs

Processes:

chthonic_2.23.21.2.vir.exe

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

Processes:

LogonUI.exe

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 Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Winlogon Helper DLL

1

T1004

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

\Users\Admin\AppData\Local\Temp\3269363354.ocx

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\Users\Admin\AppData\Local\Temp\335A49504A.ocx

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\Users\Admin\AppData\Local\Temp\3446776945.ocx

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\Users\Admin\AppData\Local\Temp\3451716841.ocx

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\Users\Admin\AppData\Local\Temp\45546D376F.ocx

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\Users\Admin\AppData\Local\Temp\7263463663.ocx

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Analysis

Sharing

Errors

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads