99c26c4d8369870729694df2adae9bbb20e1644d579594e2d84e7bbd3f68450b

Analysis

max time kernel
82s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
05-01-2024 09:44

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General

Target

435c95968bae518f0154467f1a038bd2.dll
Size

25KB
MD5

435c95968bae518f0154467f1a038bd2
SHA1

9a05a388781a0e19d970754ac4b0abccff869700
SHA256

99c26c4d8369870729694df2adae9bbb20e1644d579594e2d84e7bbd3f68450b
SHA512

47b2f9f279e5dc8af70455c712084b1252cec23a81a513c794344413070c6c958d803de977543cc19d3ab2eb2cb8a0e89c4b8b36623be30957624327c805a15f
SSDEEP

768:AGzATDOsUv3PYu1uVuS2177vAVM9JVYuGpO+N:o3OsU/PpvlgMtxGb

Score

7^/10

persistence

Malware Config

Signatures

Loads dropped DLL 3 IoCs

pid	Process
2860	rundll32.exe
2860	rundll32.exe
5108	rundll32.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\MSServer = "rundll32.exe C:\\Windows\\system32\\tuvSkHyw.dll,#1"	rundll32.exe

Drops file in System32 directory 2 IoCs

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

Modifies registry class 4 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4F06B779-D0FD-4580-8C9B-6EAEB70F10AE}	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4F06B779-D0FD-4580-8C9B-6EAEB70F10AE}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4F06B779-D0FD-4580-8C9B-6EAEB70F10AE}\InprocServer32\ = "C:\\Windows\\SysWow64\\tuvSkHyw.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{4F06B779-D0FD-4580-8C9B-6EAEB70F10AE}\InprocServer32\ThreadingModel = "Both"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2860	rundll32.exe
2860	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe
5108	rundll32.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
2860	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2860	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2860	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4784 wrote to memory of 2860	4784	rundll32.exe	14
PID 4784 wrote to memory of 2860	4784	rundll32.exe	14
PID 4784 wrote to memory of 2860	4784	rundll32.exe	14
PID 2860 wrote to memory of 600	2860	rundll32.exe	3
PID 2860 wrote to memory of 5108	2860	rundll32.exe	100
PID 2860 wrote to memory of 5108	2860	rundll32.exe	100
PID 2860 wrote to memory of 5108	2860	rundll32.exe	100

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:600

C:\Windows\SysWOW64\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\435c95968bae518f0154467f1a038bd2.dll,#1
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2860
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Windows\system32\tuvSkHyw.dll,a
  2⤵
  - Loads dropped DLL
  - Adds Run key to start application
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  PID:5108

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\435c95968bae518f0154467f1a038bd2.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4784

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Windows\SysWOW64\tuvSkHyw.dll

Filesize
25KB

MD5
435c95968bae518f0154467f1a038bd2

SHA1
9a05a388781a0e19d970754ac4b0abccff869700

SHA256
99c26c4d8369870729694df2adae9bbb20e1644d579594e2d84e7bbd3f68450b

SHA512
47b2f9f279e5dc8af70455c712084b1252cec23a81a513c794344413070c6c958d803de977543cc19d3ab2eb2cb8a0e89c4b8b36623be30957624327c805a15f

Download Submit
memory/2860-0-0x0000000010000000-0x0000000010012000-memory.dmp

Filesize
72KB

Download
memory/2860-1-0x0000000010000000-0x0000000010012000-memory.dmp

Filesize
72KB

Download
memory/2860-2-0x0000000010000000-0x0000000010012000-memory.dmp

Filesize
72KB

Download
memory/2860-10-0x0000000002FB0000-0x0000000002FC2000-memory.dmp

Filesize
72KB

Download
memory/2860-9-0x0000000002FB0000-0x0000000002FC2000-memory.dmp

Filesize
72KB

Download
memory/5108-19-0x0000000010000000-0x0000000010012000-memory.dmp

Filesize
72KB

Download
memory/5108-18-0x0000000010000000-0x0000000010012000-memory.dmp

Filesize
72KB

Download
memory/5108-17-0x0000000010000000-0x0000000010012000-memory.dmp

Filesize
72KB

Download
memory/5108-20-0x0000000010000000-0x0000000010012000-memory.dmp

Filesize
72KB

Download