ced56f87e7c86b11bf18d8ef62fe812c678c945edcc0316cd45da91751bacbba

Analysis

max time kernel
90s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
resource tags

arch:x64arch:x86image:win10v2004-20220414-enlocale:en-usos:windows10-2004-x64system
submitted
15-07-2022 11:02

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General

Target

otkepwxaym.dll
Size

9.3MB
MD5

c7f0ee90d71cd00a7709f409a4bb027d
SHA1

bdb0a4f52cf7b270befc926f28f606e4df6d6225
SHA256

e7db2ba32e4620a34b83de0bc5a728b8e3934f8d3e659785f48888a3930a3412
SHA512

2d84cbee27f8c6a1c8630a232a7eef9ff1bcce15e30b02cd37321528e87a5897c42d38c17a9cc84580e995fd2262bada588d3286c4eda6e3f84919fddb0f644d

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
behavioral4/memory/548-131-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-132-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-134-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-135-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-136-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-137-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-138-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-139-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-140-0x00000000024E0000-0x0000000003D47000-memory.dmp	themida
behavioral4/memory/548-141-0x00000000024E0000-0x0000000003D47000-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

548 rundll32.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

4796 548 WerFault.exe rundll32.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

rundll32.exe

pid process

548 rundll32.exe
548 rundll32.exe

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

pid	process
548	rundll32.exe

pid	pid_target	process	target process
4796	548	WerFault.exe	rundll32.exe

pid	process
548	rundll32.exe
548	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

rundll32.exe

description	pid	process	target process
PID 4192 wrote to memory of 548	4192	rundll32.exe	rundll32.exe
PID 4192 wrote to memory of 548	4192	rundll32.exe	rundll32.exe
PID 4192 wrote to memory of 548	4192	rundll32.exe	rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\otkepwxaym.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4192

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\otkepwxaym.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:548

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 548 -s 792
3⤵
- Program crash
PID:4796

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 548 -ip 548
1⤵
PID:4408

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/548-130-0x0000000000000000-mapping.dmp

Download
memory/548-131-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-132-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-133-0x0000000077C90000-0x0000000077E33000-memory.dmp

Filesize
1.6MB

Download
memory/548-134-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-135-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-136-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-137-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-138-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-139-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-140-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-141-0x00000000024E0000-0x0000000003D47000-memory.dmp

Filesize
24.4MB

Download
memory/548-142-0x0000000077C90000-0x0000000077E33000-memory.dmp

Filesize
1.6MB

Download
memory/548-143-0x0000000077C90000-0x0000000077E33000-memory.dmp

Filesize
1.6MB

Download