d51bb6d4fec3beb3d37a9ee900e12d09f30e5ffb32f9045b51a7434c5aa03709

Analysis

max time kernel
148s
max time network
141s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
07/08/2026, 10:19

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General

Target
d51bb6d4fec3beb3d37a9ee900e12d09f30e5ffb32f9045b51a7434c5aa03709.dll
Size 2.4MB
Sample260807-mczdeasgla
SHA256 d51bb6d4fec3beb3d37a9ee900e12d09f30e5ffb32f9045b51a7434c5aa03709
MD5 a85c0d0d63849bb442cb8c42e8e873e2
SHA1 34a276ac016e5b7b77a33ab88297a8595affd6b5
SHA512 bb0bb6d091c356451837ef7ededdc6f74cfa61e891f15b43ef67cf390d6c2bd7c98821ded3ee514f6ca1d177f240f7024655b50dbbbe50176ef7a6530b6b4a84
SSDEEP 49152:2jCKgIQ4SocAAZFTZaqdwk0c05HGifC+TAqNiLHD7XfjkfTjpm:IjQ4SLAAZFYqdwkLcHH6rn7Pjk
TLSH
T1F1C5E112F59180F1D525113104FB2739AB79AA960B24DE87F3A8DFB93D22271E23735E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

8^/10

bootkit discovery persistence upx

Malware Config

Signatures

Badlisted process makes network request 1 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
1	3076	rundll32.exe

ACProtect 1.3x - 1.4x DLL software 1 IoCs

Detects file using ACProtect software.

resource	yara_rule
behavioral2/files/0x000e00000001c4fd-4.dat	acprotect

Loads dropped DLL 1 IoCs

pid	Process
3076	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	rundll32.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\SkinH_EL.dll	rundll32.exe
File opened for modification	C:\Windows\SysWOW64\SkinH_EL.dll	rundll32.exe

UPX packed file 3 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/files/0x000e00000001c4fd-4.dat	upx
behavioral2/memory/3076-7-0x0000000010000000-0x000000001003D000-memory.dmp	upx
behavioral2/memory/3076-10-0x0000000010000000-0x000000001003D000-memory.dmp	upx

Program crash 1 IoCs

pid	pid_target	Process	procid_target
3572	3076	WerFault.exe	89

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3076	rundll32.exe
3076	rundll32.exe

Suspicious use of SetWindowsHookEx 44 IoCs

pid	Process
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe
3076	rundll32.exe

Suspicious use of WriteProcessMemory 1 IoCs

description	pid	Process	procid_target
PID 4560 wrote to memory of 3076	4560	rundll32.exe	89

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\d51bb6d4fec3beb3d37a9ee900e12d09f30e5ffb32f9045b51a7434c5aa03709.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4560
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\d51bb6d4fec3beb3d37a9ee900e12d09f30e5ffb32f9045b51a7434c5aa03709.dll,#1
  2⤵
  - Badlisted process makes network request
  - Loads dropped DLL
  - Writes to the Master Boot Record (MBR)
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetWindowsHookEx
  PID:3076
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3076 -s 924
    3⤵
    - Program crash
    PID:3572

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3076 -ip 3076
1⤵
PID:4712

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

SkinH_EL.dll

Path C:\Windows\SysWOW64\SkinH_EL.dll
Size 86KB
SHA256 edf679c02ea2e170e67ab20dfc18558e2bfb4ee5d59eceeaea4b1ad1a626c3cc
MD5 147127382e001f495d1842ee7a9e7912
SHA1 92d1ed56032183c75d4b57d7ce30b1c4ae11dc9b
SHA512 97f5ae90a1bbacfe39b9e0f2954c24f9896cc9dca9d14364c438862996f3bbc04a4aa515742fccb3679d222c1302f5bb40c7eaddd6b5859d2d6ef79490243a4d
SSDEEP 1536:s5Np2dgZgIehUUS3E1Ujmrvl179D53UWnGQRJZiXRmrCnKptnouy8K:s5Np2dlUX0+Cx17F8QRJZKmOK3outK
TLSH
T1D68302B591F8AC56D4671ABE4D7E920B40C06557B6D0CCF91FA8218BAC6EEC287F4306
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3076-0-0x000000000C8CC000-0x000000000C8CD000-memory.dmp

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memory/3076-1-0x000000000C7F0000-0x000000000CAA1000-memory.dmp

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memory/3076-7-0x0000000010000000-0x000000001003D000-memory.dmp

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memory/3076-9-0x000000000C7F0000-0x000000000CAA1000-memory.dmp

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memory/3076-10-0x0000000010000000-0x000000001003D000-memory.dmp

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