5124f1b8847074cf927f1fe6dec6657a3a50c32e924f7ff915c926604c207b25

General

Target

chthonic_2.23.14.3.vir.exe
Size

316KB
MD5

c73bb0ecba9a48fa54ce209becf415a1
SHA1

71323430b7752734c495e1bbb42889ebc041a5c8
SHA256

5124f1b8847074cf927f1fe6dec6657a3a50c32e924f7ff915c926604c207b25
SHA512

1aaaf0457a3453c5dc4ec9fbffe69816c412ac3ab987973a095873668688f82129d196f91a7b44ede0a9fcebf52bad9de84ad100b97a135ea77ed6fa21a37c1e

Score

10^/10

persistence evasion trojan

Malware Config

Signatures

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

chthonic_2.23.14.3.vir.exe

description	pid	process	target process
PID 2024 wrote to memory of 2756	2024	chthonic_2.23.14.3.vir.exe	msiexec.exe
PID 2024 wrote to memory of 2756	2024	chthonic_2.23.14.3.vir.exe	msiexec.exe
PID 2024 wrote to memory of 2756	2024	chthonic_2.23.14.3.vir.exe	msiexec.exe
PID 2024 wrote to memory of 2756	2024	chthonic_2.23.14.3.vir.exe	msiexec.exe

Blacklisted process makes network request 21 IoCs

Processes:

msiexec.exe

flow	pid	process
7	2756	msiexec.exe
11	2756	msiexec.exe
12	2756	msiexec.exe
14	2756	msiexec.exe
15	2756	msiexec.exe
16	2756	msiexec.exe
17	2756	msiexec.exe
18	2756	msiexec.exe
19	2756	msiexec.exe
20	2756	msiexec.exe
22	2756	msiexec.exe
24	2756	msiexec.exe
25	2756	msiexec.exe
26	2756	msiexec.exe
27	2756	msiexec.exe
28	2756	msiexec.exe
29	2756	msiexec.exe
31	2756	msiexec.exe
32	2756	msiexec.exe
33	2756	msiexec.exe
36	2756	msiexec.exe

Disables taskbar notifications via registry modification
evasion

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\System\EnableLUA = "0"	msiexec.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\policies\Explorer	msiexec.exe
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

Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

chthonic_2.23.14.3.vir.exe

description	pid	process
Token: SeBackupPrivilege	2024	chthonic_2.23.14.3.vir.exe
Token: SeSecurityPrivilege	2024	chthonic_2.23.14.3.vir.exe
Token: SeSecurityPrivilege	2024	chthonic_2.23.14.3.vir.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

chthonic_2.23.14.3.vir.exe

pid process

2024 chthonic_2.23.14.3.vir.exe

pid	process
2024	chthonic_2.23.14.3.vir.exe

Modifies Internet Explorer settings 1 TTPs 6 IoCs

adware spyware

Modify Registry

T1112

Processes:

msiexec.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Internet Explorer\PhishingFilter\EnabledV9 = "0"	msiexec.exe
Key created	\REGISTRY\USER\S-1-5-21-1231583446-2617009595-2137880041-1000\Software\Microsoft\Internet Explorer\PhishingFilter	msiexec.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1231583446-2617009595-2137880041-1000\Software\Microsoft\Internet Explorer\PhishingFilter\EnabledV8 = "0"	msiexec.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1231583446-2617009595-2137880041-1000\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

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

UAC bypass 3 TTPs
evasion trojan

Bypass User Account Control
T1088

Disabling Security Tools
T1089

Modify Registry
T1112
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

msiexec.exe

pid process

2756 msiexec.exe
2756 msiexec.exe
2756 msiexec.exe
2756 msiexec.exe

pid	process
2756	msiexec.exe
2756	msiexec.exe
2756	msiexec.exe
2756	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\UMozillaMaintenanceService = "C:\\ProgramData\\Mozilla Maintenance Service\\UMozillaMaintenanceService.exe"	msiexec.exe

C:\Users\Admin\AppData\Local\Temp\chthonic_2.23.14.3.vir.exe
"C:\Users\Admin\AppData\Local\Temp\chthonic_2.23.14.3.vir.exe"
1⤵
- Suspicious use of WriteProcessMemory
- Suspicious use of AdjustPrivilegeToken
- Suspicious behavior: GetForegroundWindowSpam
PID:2024

C:\Windows\SysWOW64\msiexec.exe
msiexec.exe
2⤵
- Blacklisted process makes network request
- System policy modification
- Modifies Internet Explorer settings
- Checks whether UAC is enabled
- Suspicious behavior: EnumeratesProcesses
- Adds policy Run key to start application
PID:2756