quasar | ec5fa919b523ea3effb48a867b496d30a3bbf2208bc5652f812ebd0d87889ad0

Virtualization/Sandbox Evasion

T1497

Processes:

loader.exedefenderx64.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	loader.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	defenderx64.exe

Checks BIOS information in registry 2 TTPs 4 IoCs

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

Query Registry

System Information Discovery

Processes:

loader.exedefenderx64.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	loader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	loader.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	defenderx64.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	defenderx64.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

Processes:

defenderx64.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-540404634-651139247-2967210625-1000\Control Panel\International\Geo\Nation	defenderx64.exe

Executes dropped EXE 1 IoCs

Processes:

defenderx64.exe

pid process

2336 defenderx64.exe

pid	process
2336	defenderx64.exe

Themida packer 7 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral2/memory/4836-10-0x0000000000400000-0x000000000109A000-memory.dmp	themida
behavioral2/memory/4836-11-0x0000000000400000-0x000000000109A000-memory.dmp	themida
C:\Users\Admin\AppData\Roaming\en\defenderx64.exe	themida
behavioral2/memory/4836-22-0x0000000000400000-0x000000000109A000-memory.dmp	themida
behavioral2/memory/2336-24-0x0000000000400000-0x000000000109A000-memory.dmp	themida
behavioral2/memory/2336-25-0x0000000000400000-0x000000000109A000-memory.dmp	themida
behavioral2/memory/2336-40-0x0000000000400000-0x000000000109A000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 2 IoCs

evasion trojan

System Information Discovery

Processes:

loader.exedefenderx64.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	loader.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	defenderx64.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

loader.exedefenderx64.exe

pid process

4836 loader.exe
2336 defenderx64.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

3636 schtasks.exe
3188 schtasks.exe

pid	process
4836	loader.exe
2336	defenderx64.exe

pid	process
3636	schtasks.exe
3188	schtasks.exe

Modifies data under HKEY_USERS 15 IoCs

Processes:

LogonUI.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "12"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

loader.exedefenderx64.exe

pid process

4836 loader.exe
4836 loader.exe
2336 defenderx64.exe
2336 defenderx64.exe

pid	process
4836	loader.exe
4836	loader.exe
2336	defenderx64.exe
2336	defenderx64.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

loader.exedefenderx64.exeshutdown.exe

description	pid	process
Token: SeDebugPrivilege	4836	loader.exe
Token: SeDebugPrivilege	2336	defenderx64.exe
Token: SeShutdownPrivilege	2624	shutdown.exe
Token: SeRemoteShutdownPrivilege	2624	shutdown.exe

Suspicious use of FindShellTrayWindow 4 IoCs

Processes:

defenderx64.exe

pid process

2336 defenderx64.exe
2336 defenderx64.exe
2336 defenderx64.exe
2336 defenderx64.exe
Suspicious use of SendNotifyMessage 4 IoCs

Processes:

defenderx64.exe

pid process

2336 defenderx64.exe
2336 defenderx64.exe
2336 defenderx64.exe
2336 defenderx64.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

LogonUI.exe

pid process

5104 LogonUI.exe

pid	process
2336	defenderx64.exe
2336	defenderx64.exe
2336	defenderx64.exe
2336	defenderx64.exe

pid	process
2336	defenderx64.exe
2336	defenderx64.exe
2336	defenderx64.exe
2336	defenderx64.exe

pid	process
5104	LogonUI.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

loader.exedefenderx64.exe

description	pid	process	target process
PID 4836 wrote to memory of 3636	4836	loader.exe	schtasks.exe
PID 4836 wrote to memory of 3636	4836	loader.exe	schtasks.exe
PID 4836 wrote to memory of 3636	4836	loader.exe	schtasks.exe
PID 4836 wrote to memory of 2336	4836	loader.exe	defenderx64.exe
PID 4836 wrote to memory of 2336	4836	loader.exe	defenderx64.exe
PID 4836 wrote to memory of 2336	4836	loader.exe	defenderx64.exe
PID 2336 wrote to memory of 3188	2336	defenderx64.exe	schtasks.exe
PID 2336 wrote to memory of 3188	2336	defenderx64.exe	schtasks.exe
PID 2336 wrote to memory of 3188	2336	defenderx64.exe	schtasks.exe
PID 2336 wrote to memory of 2624	2336	defenderx64.exe	shutdown.exe
PID 2336 wrote to memory of 2624	2336	defenderx64.exe	shutdown.exe
PID 2336 wrote to memory of 2624	2336	defenderx64.exe	shutdown.exe

C:\Users\Admin\AppData\Local\Temp\loader.exe
"C:\Users\Admin\AppData\Local\Temp\loader.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4836

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Windows Defender Helper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\en\defenderx64.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:3636

C:\Users\Admin\AppData\Roaming\en\defenderx64.exe
"C:\Users\Admin\AppData\Roaming\en\defenderx64.exe"
2⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks computer location settings
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:2336

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "Windows Defender Helper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\en\defenderx64.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3188

C:\Windows\SysWOW64\shutdown.exe
"C:\Windows\System32\shutdown.exe" /s /t 0
3⤵
- Suspicious use of AdjustPrivilegeToken
PID:2624

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa39b9055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:5104

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

3

Virtualization/Sandbox Evasion

T1497

System Information Discovery

4