e86c87ac79847d50f7003de2eefd8e765fa4bfc8c7d430f5f7bb1cd3da8cb23b

Analysis

max time kernel
132s
max time network
167s
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, 16:17

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General

Target

05421b72b14eaac4c4cbfa2a9fdf96fa.dll
Size

236KB
MD5

05421b72b14eaac4c4cbfa2a9fdf96fa
SHA1

69967bc7f0cb6d747bb599be87e87e3964ebdb17
SHA256

e86c87ac79847d50f7003de2eefd8e765fa4bfc8c7d430f5f7bb1cd3da8cb23b
SHA512

d5ce2d6cd5b8d6eba4a81151fd38e2cd018ff5474492dd8c65e48dcfdae60d78d1378f8600e30dac6ee74fbaef947d471e8c9a3dd835cb15d5a48c2dab366e43
SSDEEP

3072:SeqmgHwlaazN9U3J+P0wFp+bLrt2wkkII:+Qj9U3jwO3rt5D

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\anaicgwzh = "{c9ae06c1-4126-967b-5237-41268e49b93b}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
3936	rundll32.exe

Drops file in System32 directory 4 IoCs

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

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9ae06c1-4126-967b-5237-41268e49b93b}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9ae06c1-4126-967b-5237-41268e49b93b}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9ae06c1-4126-967b-5237-41268e49b93b}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9ae06c1-4126-967b-5237-41268e49b93b}\InprocServer32\ = "C:\\Windows\\SysWow64\\vivdxbruc.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9ae06c1-4126-967b-5237-41268e49b93b}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3936	rundll32.exe
3936	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3936	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3936	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 652 wrote to memory of 3936	652	rundll32.exe	88
PID 652 wrote to memory of 3936	652	rundll32.exe	88
PID 652 wrote to memory of 3936	652	rundll32.exe	88

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\05421b72b14eaac4c4cbfa2a9fdf96fa.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:652
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\05421b72b14eaac4c4cbfa2a9fdf96fa.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:3936

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\nanvptjmu.dll

Filesize
478KB

MD5
e99416267b61f52fa5ab994019efd359

SHA1
86d31eae707db7fe51d2556394fcf0e8e9f6b0fd

SHA256
768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774

SHA512
0a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae

Download Submit
memory/3936-0-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/3936-9-0x0000000075AA0000-0x0000000075B1A000-memory.dmp

Filesize
488KB

Download
memory/3936-10-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/3936-11-0x0000000075AA0000-0x0000000075B1A000-memory.dmp

Filesize
488KB

Download