modiloader | ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c

System Information Discovery

Processes:

ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exemstwain32.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	mstwain32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	mstwain32.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

mstwain32.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\	mstwain32.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1214520366-621468234-4062160515-1000\Software\Microsoft\Windows\CurrentVersion\Run\mstwain32 = "C:\\Windows\\mstwain32.exe"	mstwain32.exe

Checks whether UAC is enabled 1 TTPs 3 IoCs

evasion trojan

System Information Discovery

Processes:

mstwain32.exeec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	mstwain32.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	mstwain32.exe

Drops file in Windows directory 4 IoCs

Processes:

ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exemstwain32.exe

description	ioc	process
File created	C:\Windows\mstwain32.exe	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
File opened for modification	C:\Windows\mstwain32.exe	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
File created	C:\Windows\ntdtcstp.dll	mstwain32.exe
File created	C:\Windows\cmsetac.dll	mstwain32.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 16 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

Processes:

ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exemstwain32.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\FeatureSet	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Platform ID	mstwain32.exe
Key value enumerated	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	mstwain32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	mstwain32.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	mstwain32.exe
Key value enumerated	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	mstwain32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\FeatureSet	mstwain32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Platform ID	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	mstwain32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	mstwain32.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

System Information Discovery

Processes:

mstwain32.exeec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	mstwain32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exemstwain32.exe

description	pid	process
Token: SeDebugPrivilege	876	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
Token: SeDebugPrivilege	1792	mstwain32.exe
Token: SeDebugPrivilege	1792	mstwain32.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

mstwain32.exe

pid process

1792 mstwain32.exe
1792 mstwain32.exe

pid	process
1792	mstwain32.exe
1792	mstwain32.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe

description	pid	process	target process
PID 876 wrote to memory of 1792	876	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe	mstwain32.exe
PID 876 wrote to memory of 1792	876	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe	mstwain32.exe
PID 876 wrote to memory of 1792	876	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe	mstwain32.exe
PID 876 wrote to memory of 1792	876	ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe	mstwain32.exe

System policy modification 1 TTPs 1 IoCs
evasion

Modify Registry
T1112

Processes:

mstwain32.exe

description ioc process

Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" mstwain32.exe

C:\Users\Admin\AppData\Local\Temp\ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe
"C:\Users\Admin\AppData\Local\Temp\ec3873b9136338a5b8d42353cf33ea70496e6f9768ff7779d087800b84d5492c.exe"
1⤵
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Drops file in Windows directory
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:876

C:\Windows\mstwain32.exe
"C:\Windows\mstwain32.exe"
2⤵
- UAC bypass
- Executes dropped EXE
- Checks BIOS information in registry
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Windows directory
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- System policy modification
PID:1792

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Bypass User Account Control

T1088

Defense Evasion

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

3

T1112

Credential Access

Discovery

Query Registry

3

System Information Discovery

5