6776efe2216dd81f0794d507b7cbd3c3f6b6b34406b1eb3cda6b34d724c90e38

General

Target

zbyrtzciif.dll
Size

7.0MB
MD5

e542f38011cc165154b3178db74032cb
SHA1

e09fc2c03003e84790be3a17b97fa2e90f08e2e9
SHA256

5019200109e04421b1097f6426450551e215c1b83f759a79fb4373e33d3d1002
SHA512

4911dc7e2233a1b2033801b222e674cf0c22915bdc1445059c12f52281df81c67b2f7009e3c8f048ca9131dbf608595467c5e20095844e66d985356410eb7ccf

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 8 IoCs

Detects Themida, an advanced Windows software protection system.

themida

Processes:

resource	yara_rule
behavioral5/memory/1044-56-0x0000000002400000-0x0000000003553000-memory.dmp	themida
behavioral5/memory/1044-58-0x0000000002400000-0x0000000003553000-memory.dmp	themida
behavioral5/memory/1044-59-0x0000000002400000-0x0000000003553000-memory.dmp	themida
behavioral5/memory/1044-60-0x0000000002400000-0x0000000003553000-memory.dmp	themida
behavioral5/memory/1044-61-0x0000000002400000-0x0000000003553000-memory.dmp	themida
behavioral5/memory/1044-62-0x0000000002400000-0x0000000003553000-memory.dmp	themida
behavioral5/memory/1044-63-0x0000000002400000-0x0000000003553000-memory.dmp	themida
behavioral5/memory/1044-64-0x0000000002400000-0x0000000003553000-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

1044 rundll32.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1240 1044 WerFault.exe rundll32.exe

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

pid	process
1044	rundll32.exe

pid	pid_target	process	target process
1240	1044	WerFault.exe	rundll32.exe

Suspicious use of WriteProcessMemory 11 IoCs

Processes:

rundll32.exerundll32.exe

description	pid	process	target process
PID 1672 wrote to memory of 1044	1672	rundll32.exe	rundll32.exe
PID 1672 wrote to memory of 1044	1672	rundll32.exe	rundll32.exe
PID 1672 wrote to memory of 1044	1672	rundll32.exe	rundll32.exe
PID 1672 wrote to memory of 1044	1672	rundll32.exe	rundll32.exe
PID 1672 wrote to memory of 1044	1672	rundll32.exe	rundll32.exe
PID 1672 wrote to memory of 1044	1672	rundll32.exe	rundll32.exe
PID 1672 wrote to memory of 1044	1672	rundll32.exe	rundll32.exe
PID 1044 wrote to memory of 1240	1044	rundll32.exe	WerFault.exe
PID 1044 wrote to memory of 1240	1044	rundll32.exe	WerFault.exe
PID 1044 wrote to memory of 1240	1044	rundll32.exe	WerFault.exe
PID 1044 wrote to memory of 1240	1044	rundll32.exe	WerFault.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\zbyrtzciif.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1672

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\zbyrtzciif.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:1044

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1044 -s 316
3⤵
- Program crash
PID:1240

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/1044-54-0x0000000000000000-mapping.dmp

Download
memory/1044-55-0x00000000763C1000-0x00000000763C3000-memory.dmp

Filesize
8KB

Download
memory/1044-57-0x0000000077690000-0x0000000077810000-memory.dmp

Filesize
1.5MB

Download
memory/1044-56-0x0000000002400000-0x0000000003553000-memory.dmp

Filesize
17.3MB

Download
memory/1044-58-0x0000000002400000-0x0000000003553000-memory.dmp

Filesize
17.3MB

Download
memory/1044-59-0x0000000002400000-0x0000000003553000-memory.dmp

Filesize
17.3MB

Download
memory/1044-60-0x0000000002400000-0x0000000003553000-memory.dmp

Filesize
17.3MB

Download
memory/1044-61-0x0000000002400000-0x0000000003553000-memory.dmp

Filesize
17.3MB

Download
memory/1044-62-0x0000000002400000-0x0000000003553000-memory.dmp

Filesize
17.3MB

Download
memory/1044-63-0x0000000002400000-0x0000000003553000-memory.dmp

Filesize
17.3MB

Download
memory/1044-64-0x0000000002400000-0x0000000003553000-memory.dmp

Filesize
17.3MB

Download
memory/1240-65-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads