smokeloader | bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f

System Information Discovery

Processes:

F11C.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	F11C.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	F11C.exe

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

EF95.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation EF95.exe
Loads dropped DLL 2 IoCs

Processes:

F11C.exe

pid process

3192 F11C.exe
3192 F11C.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses 2FA software files, possible credential harvesting 2 TTPs
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

F11C.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA F11C.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

F11C.exe

pid process

3192 F11C.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Program crash 2 IoCs

Processes:

WerFault.exeWerFault.exe

pid pid_target process target process

4680 2108 WerFault.exe EF95.exe
3956 3192 WerFault.exe F11C.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4246620582-653642754-1174164128-1000\Control Panel\International\Geo\Nation	EF95.exe

pid	process
3192	F11C.exe
3192	F11C.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	F11C.exe

pid	process
3192	F11C.exe

pid	pid_target	process	target process
4680	2108	WerFault.exe	EF95.exe
3956	3192	WerFault.exe	F11C.exe

Checks SCSI registry key(s) 3 TTPs 3 IoCs

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

Query Registry

Peripheral Device Discovery

T1120

System Information Discovery

Processes:

bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe
Key enumerated	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe

Checks processor information in registry 2 TTPs 2 IoCs

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

Query Registry

System Information Discovery

Processes:

F11C.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	F11C.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	F11C.exe

Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

4416 schtasks.exe

pid	process
4416	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe

pid	process
1440	bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe
1440	bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe
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Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

pid process

2648
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe

pid process

1440 bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe

pid	process
2648

Suspicious use of AdjustPrivilegeToken 10 IoCs

Processes:

description	pid	process
Token: SeShutdownPrivilege	2648
Token: SeCreatePagefilePrivilege	2648
Token: SeShutdownPrivilege	2648
Token: SeCreatePagefilePrivilege	2648
Token: SeShutdownPrivilege	2648
Token: SeCreatePagefilePrivilege	2648
Token: SeShutdownPrivilege	2648
Token: SeCreatePagefilePrivilege	2648
Token: SeShutdownPrivilege	2648
Token: SeCreatePagefilePrivilege	2648

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

EF95.exe

description	pid	process	target process
PID 2648 wrote to memory of 2108	2648		EF95.exe
PID 2648 wrote to memory of 2108	2648		EF95.exe
PID 2648 wrote to memory of 2108	2648		EF95.exe
PID 2648 wrote to memory of 3192	2648		F11C.exe
PID 2648 wrote to memory of 3192	2648		F11C.exe
PID 2648 wrote to memory of 3192	2648		F11C.exe
PID 2108 wrote to memory of 4416	2108	EF95.exe	schtasks.exe
PID 2108 wrote to memory of 4416	2108	EF95.exe	schtasks.exe
PID 2108 wrote to memory of 4416	2108	EF95.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe
"C:\Users\Admin\AppData\Local\Temp\bc920b349c0edabf7b151dc527d3d4a31aabc2a24fb8265ead0b36f2695ef88f.exe"
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
PID:1440

C:\Users\Admin\AppData\Local\Temp\EF95.exe
C:\Users\Admin\AppData\Local\Temp\EF95.exe
1⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2108

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /tn "svcupdater" /tr "C:\Users\Admin\AppData\Roaming\Win32Sync\svcupdater.exe" /st 00:00 /du 9999:59 /sc once /ri 1 /f
2⤵
- Creates scheduled task(s)
PID:4416

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2108 -s 1032
2⤵
- Program crash
PID:4680

C:\Users\Admin\AppData\Local\Temp\F11C.exe
C:\Users\Admin\AppData\Local\Temp\F11C.exe
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Executes dropped EXE
- Checks BIOS information in registry
- Loads dropped DLL
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Checks processor information in registry
PID:3192

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3192 -s 1812
2⤵
- Program crash
PID:3956

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2108 -ip 2108
1⤵
PID:2828

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 3192 -ip 3192
1⤵
PID:2388

C:\Users\Admin\AppData\Roaming\Win32Sync\svcupdater.exe
C:\Users\Admin\AppData\Roaming\Win32Sync\svcupdater.exe
1⤵
- Executes dropped EXE
PID:3128

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Credentials in Files

3

T1081

Discovery

Query Registry

6

Virtualization/Sandbox Evasion

T1497

System Information Discovery

6

Peripheral Device Discovery