e0e004f3f660c91d1a3d6049e28a62c62d5ac2cd843a7950cc72b17786254eb8

Analysis

max time kernel
157s
max time network
173s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
24-12-2023 15:14

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General

Target

034a918350bcfa9aeae2fc802466f0f5.dll
Size

236KB
MD5

034a918350bcfa9aeae2fc802466f0f5
SHA1

ba68dd45e0788a2337c8ad5344de81b5b09c2023
SHA256

e0e004f3f660c91d1a3d6049e28a62c62d5ac2cd843a7950cc72b17786254eb8
SHA512

b377cfd0409f48e31f460490ceb484dde00a65f8a9d3f5da512bf312c82b1db13406c074bfa55cfad831c2e37ecf61300b3ed3fe952259c491a0730d4f9b3421
SSDEEP

3072:SeqmgHwlaazN9U3J+P0wFp+bLrt2wkkIk:+Qj9U3jwO3rt5b

Score

10^/10

persistence

Malware Config

Signatures

Adds autorun key to be loaded by Explorer.exe on startup 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad\gpkny = "{45c30702-cd4b-1290-de5c-cd4b8f8a0b82}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
3248	rundll32.exe

Drops file in System32 directory 4 IoCs

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

Modifies registry class 5 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{45c30702-cd4b-1290-de5c-cd4b8f8a0b82}\InprocServer32\ = "C:\\Windows\\SysWow64\\bkfit.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{45c30702-cd4b-1290-de5c-cd4b8f8a0b82}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{45c30702-cd4b-1290-de5c-cd4b8f8a0b82}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{45c30702-cd4b-1290-de5c-cd4b8f8a0b82}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{45c30702-cd4b-1290-de5c-cd4b8f8a0b82}\InprocServer32	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3248	rundll32.exe
3248	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3248	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3248	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4892 wrote to memory of 3248	4892	rundll32.exe	68
PID 4892 wrote to memory of 3248	4892	rundll32.exe	68
PID 4892 wrote to memory of 3248	4892	rundll32.exe	68

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\034a918350bcfa9aeae2fc802466f0f5.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4892
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\034a918350bcfa9aeae2fc802466f0f5.dll,#1
  2⤵
  - Adds autorun key to be loaded by Explorer.exe on startup
  - Loads dropped DLL
  - Drops file in System32 directory
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:3248

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\tcxal.dll

Filesize
478KB

MD5
e99416267b61f52fa5ab994019efd359

SHA1
86d31eae707db7fe51d2556394fcf0e8e9f6b0fd

SHA256
768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774

SHA512
0a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae

Download Submit
memory/3248-0-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/3248-7-0x0000000077310000-0x000000007738A000-memory.dmp

Filesize
488KB

Download
memory/3248-8-0x0000000077310000-0x000000007738A000-memory.dmp

Filesize
488KB

Download
memory/3248-11-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/3248-12-0x0000000077310000-0x000000007738A000-memory.dmp

Filesize
488KB

Download