smokeloader | 3403ded5e22e7138f5d7ab52ad1183d607a1072232c87668aad3c4e96c586e29

System Information Discovery

Processes:

C70F.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	C70F.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	C70F.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:

C587.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation C587.exe
Loads dropped DLL 2 IoCs

Processes:

C70F.exe

pid process

3636 C70F.exe
3636 C70F.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:

C70F.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA C70F.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

C70F.exe

pid process

3636 C70F.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

2864 1600 WerFault.exe C587.exe
4688 3636 WerFault.exe C70F.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	C587.exe

pid	process
3636	C70F.exe
3636	C70F.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	C70F.exe

pid	process
3636	C70F.exe

pid	pid_target	process	target process
2864	1600	WerFault.exe	C587.exe
4688	3636	WerFault.exe	C70F.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:

211b0b04c2f56d909477c145aecee522.exe

description	ioc	process
Key enumerated	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	211b0b04c2f56d909477c145aecee522.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	211b0b04c2f56d909477c145aecee522.exe
Key queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI	211b0b04c2f56d909477c145aecee522.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:

C70F.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	C70F.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	C70F.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

3972 schtasks.exe

pid	process
3972	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

211b0b04c2f56d909477c145aecee522.exe

pid	process
4464	211b0b04c2f56d909477c145aecee522.exe
4464	211b0b04c2f56d909477c145aecee522.exe
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Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

pid process

1272
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

211b0b04c2f56d909477c145aecee522.exe

pid process

4464 211b0b04c2f56d909477c145aecee522.exe

pid	process
1272

Suspicious use of AdjustPrivilegeToken 10 IoCs

Processes:

description	pid	process
Token: SeShutdownPrivilege	1272
Token: SeCreatePagefilePrivilege	1272
Token: SeShutdownPrivilege	1272
Token: SeCreatePagefilePrivilege	1272
Token: SeShutdownPrivilege	1272
Token: SeCreatePagefilePrivilege	1272
Token: SeShutdownPrivilege	1272
Token: SeCreatePagefilePrivilege	1272
Token: SeShutdownPrivilege	1272
Token: SeCreatePagefilePrivilege	1272

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

C587.exe

description	pid	process	target process
PID 1272 wrote to memory of 1600	1272		C587.exe
PID 1272 wrote to memory of 1600	1272		C587.exe
PID 1272 wrote to memory of 1600	1272		C587.exe
PID 1272 wrote to memory of 3636	1272		C70F.exe
PID 1272 wrote to memory of 3636	1272		C70F.exe
PID 1272 wrote to memory of 3636	1272		C70F.exe
PID 1600 wrote to memory of 3972	1600	C587.exe	schtasks.exe
PID 1600 wrote to memory of 3972	1600	C587.exe	schtasks.exe
PID 1600 wrote to memory of 3972	1600	C587.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\211b0b04c2f56d909477c145aecee522.exe
"C:\Users\Admin\AppData\Local\Temp\211b0b04c2f56d909477c145aecee522.exe"
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
PID:4464

C:\Users\Admin\AppData\Local\Temp\C587.exe
C:\Users\Admin\AppData\Local\Temp\C587.exe
1⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1600

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:3972

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1600 -s 1032
2⤵
- Program crash
PID:2864

C:\Users\Admin\AppData\Local\Temp\C70F.exe
C:\Users\Admin\AppData\Local\Temp\C70F.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:3636

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3636 -s 1852
2⤵
- Program crash
PID:4688

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1600 -ip 1600
1⤵
PID:3220

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 3636 -ip 3636
1⤵
PID:3820

C:\Users\Admin\AppData\Roaming\Win32Sync\svcupdater.exe
C:\Users\Admin\AppData\Roaming\Win32Sync\svcupdater.exe
1⤵
- Executes dropped EXE
PID:2280

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