smokeloader | 52d2e4bae2325447679354f2e85e91458ef7c3dfeb2d88c20e461d4b0f7d49bb

System Information Discovery

Processes:

DB81.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	DB81.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	DB81.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:

DA38.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation DA38.exe
Loads dropped DLL 2 IoCs

Processes:

DB81.exe

pid process

2800 DB81.exe
2800 DB81.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:

DB81.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA DB81.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

DB81.exe

pid process

2800 DB81.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

1064 4584 WerFault.exe DA38.exe
4976 2800 WerFault.exe DB81.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	DA38.exe

pid	process
2800	DB81.exe
2800	DB81.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	DB81.exe

pid	process
2800	DB81.exe

pid	pid_target	process	target process
1064	4584	WerFault.exe	DA38.exe
4976	2800	WerFault.exe	DB81.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:

file.exe

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

DB81.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	DB81.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	DB81.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

812 schtasks.exe

pid	process
812	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

file.exe

pid	process
4564	file.exe
4564	file.exe
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Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

pid process

2808
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

file.exe

pid process

4564 file.exe

pid	process
2808

Suspicious use of AdjustPrivilegeToken 10 IoCs

Processes:

description	pid	process
Token: SeShutdownPrivilege	2808
Token: SeCreatePagefilePrivilege	2808
Token: SeShutdownPrivilege	2808
Token: SeCreatePagefilePrivilege	2808
Token: SeShutdownPrivilege	2808
Token: SeCreatePagefilePrivilege	2808
Token: SeShutdownPrivilege	2808
Token: SeCreatePagefilePrivilege	2808
Token: SeShutdownPrivilege	2808
Token: SeCreatePagefilePrivilege	2808

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

DA38.exe

description	pid	process	target process
PID 2808 wrote to memory of 4584	2808		DA38.exe
PID 2808 wrote to memory of 4584	2808		DA38.exe
PID 2808 wrote to memory of 4584	2808		DA38.exe
PID 2808 wrote to memory of 2800	2808		DB81.exe
PID 2808 wrote to memory of 2800	2808		DB81.exe
PID 2808 wrote to memory of 2800	2808		DB81.exe
PID 4584 wrote to memory of 812	4584	DA38.exe	schtasks.exe
PID 4584 wrote to memory of 812	4584	DA38.exe	schtasks.exe
PID 4584 wrote to memory of 812	4584	DA38.exe	schtasks.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
PID:4564

C:\Users\Admin\AppData\Local\Temp\DA38.exe
C:\Users\Admin\AppData\Local\Temp\DA38.exe
1⤵
- Executes dropped EXE
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4584

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:812

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4584 -s 1028
2⤵
- Program crash
PID:1064

C:\Users\Admin\AppData\Local\Temp\DB81.exe
C:\Users\Admin\AppData\Local\Temp\DB81.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:2800

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2800 -s 1848
2⤵
- Program crash
PID:4976

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4584 -ip 4584
1⤵
PID:5000

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2800 -ip 2800
1⤵
PID:3820

C:\Users\Admin\AppData\Roaming\Win32Sync\svcupdater.exe
C:\Users\Admin\AppData\Roaming\Win32Sync\svcupdater.exe
1⤵
- Executes dropped EXE
PID:5088

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