c4ed0c6c4546d7c623c7547eae8ff038756ab19347aae86b9ab1517566550efa

Analysis

max time kernel
141s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220721-en
resource tags

arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
submitted
09-08-2022 08:08

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General

Target

iwcfbelmib.dll
Size

8.9MB
MD5

64407b3d50b351fb556850b5004ab591
SHA1

7ea3ed01bb26aaa7a90edd1c4fceea2de7ecebe1
SHA256

204f4aed39fc7625256f5f48812d8881c7f79b692bac0b0a484aba93205e061a
SHA512

25c0343283bb2097d135918c2eb61c8828575b4bef97a831577a321364ded073808c8588e391d681566974ef5ac192dd36ecaa4e05befddeb0b0e11833ef9e96

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
behavioral2/memory/4492-131-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-132-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-134-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-135-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-136-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-137-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-138-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-139-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-140-0x00000000028F0000-0x000000000403D000-memory.dmp	themida
behavioral2/memory/4492-141-0x00000000028F0000-0x000000000403D000-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

4492 rundll32.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1312 4492 WerFault.exe rundll32.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

rundll32.exe

pid process

4492 rundll32.exe
4492 rundll32.exe

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

pid	process
4492	rundll32.exe

pid	pid_target	process	target process
1312	4492	WerFault.exe	rundll32.exe

pid	process
4492	rundll32.exe
4492	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

rundll32.exe

description	pid	process	target process
PID 4508 wrote to memory of 4492	4508	rundll32.exe	rundll32.exe
PID 4508 wrote to memory of 4492	4508	rundll32.exe	rundll32.exe
PID 4508 wrote to memory of 4492	4508	rundll32.exe	rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\iwcfbelmib.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4508

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\iwcfbelmib.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 behavior: EnumeratesProcesses
PID:4492

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 4492 -s 768
3⤵
- Program crash
PID:1312

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 4492 -ip 4492
1⤵
PID:2212

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4492-130-0x0000000000000000-mapping.dmp

Download
memory/4492-131-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-132-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-133-0x0000000077B90000-0x0000000077D33000-memory.dmp

Filesize
1.6MB

Download
memory/4492-134-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-135-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-136-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-137-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-138-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-139-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-140-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-141-0x00000000028F0000-0x000000000403D000-memory.dmp

Filesize
23.3MB

Download
memory/4492-142-0x0000000077B90000-0x0000000077D33000-memory.dmp

Filesize
1.6MB

Download