e097234f7020f7f728106ac2648d5a77f19004bdea67c3f14a6b373575bf7af2

General

Target

chthonic_2.23.11.3.vir.exe
Size

229KB
MD5

a7ff128bb60cde180d2eea63313f59bb
SHA1

32b93a7c8d901cfc6ee01fd0f1110e2cc9b9deed
SHA256

e097234f7020f7f728106ac2648d5a77f19004bdea67c3f14a6b373575bf7af2
SHA512

800d9f861a0314b2515961a4ff859490544c95ef5683803e6e6c890675b4c1d6df496e0e04236513d495685554f7b5cd1fb0733839dbe71e66649cf48b435c64

Score

10^/10

evasion trojan persistence

Malware Config

Signatures

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

msiexec.exe

pid process

1612 msiexec.exe
1612 msiexec.exe
1612 msiexec.exe
1612 msiexec.exe
1612 msiexec.exe
1612 msiexec.exe
1612 msiexec.exe
1612 msiexec.exe
Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089
Disables taskbar notifications via registry modification
evasion

pid	process
1612	msiexec.exe
1612	msiexec.exe
1612	msiexec.exe
1612	msiexec.exe
1612	msiexec.exe
1612	msiexec.exe
1612	msiexec.exe
1612	msiexec.exe

Modifies Internet Explorer settings 1 TTPs 6 IoCs

adware spyware

Modify Registry

T1112

Processes:

msiexec.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-910373003-3952921535-3480519689-1000\Software\Microsoft\Internet Explorer\PhishingFilter	msiexec.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-910373003-3952921535-3480519689-1000\Software\Microsoft\Internet Explorer\PhishingFilter\EnabledV8 = "0"	msiexec.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-910373003-3952921535-3480519689-1000\Software\Microsoft\Internet Explorer\PhishingFilter\EnabledV9 = "0"	msiexec.exe
Key created	\REGISTRY\MACHINE\Software\Microsoft\Internet Explorer\PhishingFilter	msiexec.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Internet Explorer\PhishingFilter\EnabledV8 = "0"	msiexec.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Internet Explorer\PhishingFilter\EnabledV9 = "0"	msiexec.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

chthonic_2.23.11.3.vir.exe

description	pid	process	target process
PID 1312 wrote to memory of 1612	1312	chthonic_2.23.11.3.vir.exe	msiexec.exe
PID 1312 wrote to memory of 1612	1312	chthonic_2.23.11.3.vir.exe	msiexec.exe
PID 1312 wrote to memory of 1612	1312	chthonic_2.23.11.3.vir.exe	msiexec.exe
PID 1312 wrote to memory of 1612	1312	chthonic_2.23.11.3.vir.exe	msiexec.exe
PID 1312 wrote to memory of 1612	1312	chthonic_2.23.11.3.vir.exe	msiexec.exe
PID 1312 wrote to memory of 1612	1312	chthonic_2.23.11.3.vir.exe	msiexec.exe
PID 1312 wrote to memory of 1612	1312	chthonic_2.23.11.3.vir.exe	msiexec.exe
PID 1312 wrote to memory of 1612	1312	chthonic_2.23.11.3.vir.exe	msiexec.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

msiexec.exe

pid process

1612 msiexec.exe
UAC bypass 3 TTPs
evasion trojan

Bypass User Account Control
T1088

Disabling Security Tools
T1089

Modify Registry
T1112

pid	process
1612	msiexec.exe

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

msiexec.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\Policies\Explorer\Run	msiexec.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\WindowsPhotoViewerU = "C:\\ProgramData\\Windows Photo Viewer\\WindowsPhotoViewerU.exe"	msiexec.exe

System policy modification 1 TTPs 5 IoCs

evasion

Modify Registry

T1112

Processes:

msiexec.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\TaskbarNoNotification = "1"	msiexec.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\HideSCAHealth = "1"	msiexec.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\policies\system	msiexec.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	msiexec.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\policies\Explorer	msiexec.exe

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

msiexec.exe

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

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

chthonic_2.23.11.3.vir.exe

description pid process

Token: 0 1312 chthonic_2.23.11.3.vir.exe

description	pid	process
Token: 0	1312	chthonic_2.23.11.3.vir.exe

C:\Users\Admin\AppData\Local\Temp\chthonic_2.23.11.3.vir.exe
"C:\Users\Admin\AppData\Local\Temp\chthonic_2.23.11.3.vir.exe"
1⤵
- Suspicious use of WriteProcessMemory
- Suspicious use of AdjustPrivilegeToken
PID:1312

C:\Windows\SysWOW64\msiexec.exe
msiexec.exe
2⤵
- Suspicious behavior: EnumeratesProcesses
- Modifies Internet Explorer settings
- Suspicious behavior: GetForegroundWindowSpam
- Adds policy Run key to start application
- System policy modification
- Checks whether UAC is enabled
PID:1612