91cd8bfbe714acc43beff32856c3d56ded48706d3c92c492a1acb994b606003b

Analysis

max time kernel
1547s
max time network
1748s
platform
windows10-2004_x64
resource
win10v2004-en-20220113
submitted
16-02-2022 17:24

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General

Target

all/gcs/kryptonclient.exe
Size

3.8MB
MD5

a7beb58e9507171e44455f1f823286ab
SHA1

3689b44d42583008d5d158968bf7e81c3c0ccf3c
SHA256

e781c6915a983883f16ed22a1236e9bc93af081fb5cd3b8ec4c554ceb18183db
SHA512

35b7714979773d60296d81f57c4805cc0160db8b881a27ef4370718049949940f9d5734566b6398d5ab7b32800bf50e6f54bdd23150ad02ac60f2b7b55bd4b2b

Score

9^/10

evasion themida trojan

Malware Config

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

Processes:

kryptonclient.exe

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

Themida packer 3 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral30/memory/4860-131-0x00007FF6F96E0000-0x00007FF6FA0F7000-memory.dmp	themida
behavioral30/memory/4860-132-0x00007FF6F96E0000-0x00007FF6FA0F7000-memory.dmp	themida
behavioral30/memory/4860-133-0x00007FF6F96E0000-0x00007FF6FA0F7000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

kryptonclient.exe

description ioc process

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

Processes:

kryptonclient.exe

pid process

4860 kryptonclient.exe

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

pid	process
4860	kryptonclient.exe

Drops file in Windows directory 8 IoCs

Processes:

svchost.exeTiWorker.exe

description	ioc	process
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\DataStore.jfm	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\ReportingEvents.log	svchost.exe
File opened for modification	C:\Windows\Logs\CBS\CBS.log	TiWorker.exe
File opened for modification	C:\Windows\WinSxS\pending.xml	TiWorker.exe
File opened for modification	C:\Windows\WindowsUpdate.log	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\Logs\edb.chk	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\Logs\edb.log	svchost.exe
File opened for modification	C:\Windows\SoftwareDistribution\DataStore\DataStore.edb	svchost.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

kryptonclient.exe

pid process

4860 kryptonclient.exe
4860 kryptonclient.exe
4860 kryptonclient.exe
4860 kryptonclient.exe
4860 kryptonclient.exe
4860 kryptonclient.exe
Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

kryptonclient.exe

pid process

4860 kryptonclient.exe

pid	process
4860	kryptonclient.exe
4860	kryptonclient.exe
4860	kryptonclient.exe
4860	kryptonclient.exe
4860	kryptonclient.exe
4860	kryptonclient.exe

pid	process
4860	kryptonclient.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

Processes:

svchost.exeTiWorker.exe

description	pid	process
Token: SeShutdownPrivilege	4380	svchost.exe
Token: SeCreatePagefilePrivilege	4380	svchost.exe
Token: SeShutdownPrivilege	4380	svchost.exe
Token: SeCreatePagefilePrivilege	4380	svchost.exe
Token: SeShutdownPrivilege	4380	svchost.exe
Token: SeCreatePagefilePrivilege	4380	svchost.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe
Token: SeRestorePrivilege	4356	TiWorker.exe
Token: SeSecurityPrivilege	4356	TiWorker.exe
Token: SeBackupPrivilege	4356	TiWorker.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

kryptonclient.exe

pid process

4860 kryptonclient.exe
4860 kryptonclient.exe
4860 kryptonclient.exe

pid	process
4860	kryptonclient.exe
4860	kryptonclient.exe
4860	kryptonclient.exe

C:\Users\Admin\AppData\Local\Temp\all\gcs\kryptonclient.exe
"C:\Users\Admin\AppData\Local\Temp\all\gcs\kryptonclient.exe"
1⤵
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
PID:4860

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k netsvcs -p -s wuauserv
1⤵
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:4380

C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
1⤵
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:4356

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/4380-134-0x000002122FC20000-0x000002122FC30000-memory.dmp

Filesize
64KB

Download
memory/4380-135-0x000002122FC80000-0x000002122FC90000-memory.dmp

Filesize
64KB

Download
memory/4380-136-0x0000021232340000-0x0000021232344000-memory.dmp

Filesize
16KB

Download
memory/4380-137-0x0000021232360000-0x0000021232364000-memory.dmp

Filesize
16KB

Download
memory/4380-138-0x00000212322A0000-0x00000212322A1000-memory.dmp

Filesize
4KB

Download
memory/4380-140-0x0000021232260000-0x0000021232261000-memory.dmp

Filesize
4KB

Download
memory/4860-130-0x00007FFCFD610000-0x00007FFCFD612000-memory.dmp

Filesize
8KB

Download
memory/4860-131-0x00007FF6F96E0000-0x00007FF6FA0F7000-memory.dmp

Filesize
10.1MB

Download
memory/4860-132-0x00007FF6F96E0000-0x00007FF6FA0F7000-memory.dmp

Filesize
10.1MB

Download
memory/4860-133-0x00007FF6F96E0000-0x00007FF6FA0F7000-memory.dmp

Filesize
10.1MB

Download