a23d677c9e5176d2e98b2dae2c72842a854f4cfab658c38b29ef883831287934

General

Target

bzskttaekj.dll
Size

7.9MB
MD5

881b9fa1d9acef99650ff4e7d5cb5a7a
SHA1

571b56aabc740ce334c1b5f68909fc1fba1e6877
SHA256

7396a9044c686124956620492341842b2c4a1eb722273cd07c7b5e40d0f9bc1d
SHA512

7d736e79b8c8c033584844b998e7ad80dc22a25458ef18c476c4eb688f1d096960912cea39fa3e7e8c287c372922cbfb428c8622c99a3ea608ed3fa94f5c45ed

Score

9^/10

evasion themida trojan

Malware Config

Signatures

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Processes:

rundll32.exe

description ioc process

Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ rundll32.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	rundll32.exe

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:

rundll32.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	rundll32.exe

Themida packer 10 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral1/memory/1352-57-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-58-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-59-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-60-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-61-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-62-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-63-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-64-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-65-0x0000000002210000-0x0000000003604000-memory.dmp	themida
behavioral1/memory/1352-66-0x0000000002210000-0x0000000003604000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs
evasion trojan

System Information Discovery
T1082

Processes:

rundll32.exe

description ioc process

Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA rundll32.exe
Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

rundll32.exe

pid process

1352 rundll32.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1632 1352 WerFault.exe rundll32.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	rundll32.exe

pid	process
1352	rundll32.exe

pid	pid_target	process	target process
1632	1352	WerFault.exe	rundll32.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

rundll32.exerundll32.exe

description	pid	process	target process
PID 2032 wrote to memory of 1352	2032	rundll32.exe	rundll32.exe
PID 2032 wrote to memory of 1352	2032	rundll32.exe	rundll32.exe
PID 2032 wrote to memory of 1352	2032	rundll32.exe	rundll32.exe
PID 2032 wrote to memory of 1352	2032	rundll32.exe	rundll32.exe
PID 2032 wrote to memory of 1352	2032	rundll32.exe	rundll32.exe
PID 2032 wrote to memory of 1352	2032	rundll32.exe	rundll32.exe
PID 2032 wrote to memory of 1352	2032	rundll32.exe	rundll32.exe
PID 1352 wrote to memory of 1632	1352	rundll32.exe	WerFault.exe
PID 1352 wrote to memory of 1632	1352	rundll32.exe	WerFault.exe
PID 1352 wrote to memory of 1632	1352	rundll32.exe	WerFault.exe
PID 1352 wrote to memory of 1632	1352	rundll32.exe	WerFault.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\bzskttaekj.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:2032

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\bzskttaekj.dll,#1
2⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of WriteProcessMemory
PID:1352

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1352 -s 336
3⤵
- Program crash
PID:1632

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

1

T1497

Credential Access

Discovery

Query Registry

2

T1012

Virtualization/Sandbox Evasion

1

T1497

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/1352-60-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-62-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-56-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/1352-57-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-58-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-59-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-55-0x0000000075221000-0x0000000075223000-memory.dmp

Filesize
8KB

Download
memory/1352-61-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-54-0x0000000000000000-mapping.dmp

Download
memory/1352-63-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-64-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-65-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-66-0x0000000002210000-0x0000000003604000-memory.dmp

Filesize
20.0MB

Download
memory/1352-68-0x0000000077490000-0x0000000077610000-memory.dmp

Filesize
1.5MB

Download
memory/1632-67-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads