3289aedfb1ef5a7f045122efb2f14b5a4cdfc595bda429074e167d6b3785c271

Analysis

max time kernel
156s
max time network
159s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
30/12/2023, 07:43

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General

Target

1275853476d39c4cef449d1cd91f99a7.dll
Size

33KB
MD5

1275853476d39c4cef449d1cd91f99a7
SHA1

920749ae8ccc910f01938f308205297b5644a8c4
SHA256

3289aedfb1ef5a7f045122efb2f14b5a4cdfc595bda429074e167d6b3785c271
SHA512

e899b6580e69a63a20be13c411d87a080bf1b7c2357f6f90ec565a48895a0e08b765004ccf60d4c3d35945d113f5caa98596eaf740b52cf29c0275db0efcf452
SSDEEP

384:rbm2H7KLvJHFdd9ucDSkz/9SrOhMpPHZFVuq5XQWX401Cl4NrDMnuICyRdekj:fhbkJ/d9usSW/9OSKPpPXQSU2DMnp3df

Score

7^/10

persistence

Malware Config

Signatures

Loads dropped DLL 3 IoCs

pid	Process
3660	rundll32.exe
3660	rundll32.exe
1072	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\\wvUllmKA.dll,#1"	rundll32.exe

Drops file in System32 directory 2 IoCs

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

Modifies registry class 4 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{FBF85A20-FF88-4C46-90FB-B023E5C4ECA0}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{FBF85A20-FF88-4C46-90FB-B023E5C4ECA0}\InprocServer32\ = "C:\\Windows\\SysWow64\\wvUllmKA.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{FBF85A20-FF88-4C46-90FB-B023E5C4ECA0}\InprocServer32\ThreadingModel = "Both"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{FBF85A20-FF88-4C46-90FB-B023E5C4ECA0}	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3660	rundll32.exe
3660	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe
1072	rundll32.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
3660	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3660	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3660	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1572 wrote to memory of 3660	1572	rundll32.exe	84
PID 1572 wrote to memory of 3660	1572	rundll32.exe	84
PID 1572 wrote to memory of 3660	1572	rundll32.exe	84
PID 3660 wrote to memory of 604	3660	rundll32.exe	4
PID 3660 wrote to memory of 1072	3660	rundll32.exe	100
PID 3660 wrote to memory of 1072	3660	rundll32.exe	100
PID 3660 wrote to memory of 1072	3660	rundll32.exe	100

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:604

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\1275853476d39c4cef449d1cd91f99a7.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1572
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\1275853476d39c4cef449d1cd91f99a7.dll,#1
  2⤵
  - 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:3660
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Windows\system32\wvUllmKA.dll,a
    3⤵
    - Loads dropped DLL
    - Adds Run key to start application
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    PID:1072

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\wvUllmKA.dll

Filesize
33KB

MD5
1275853476d39c4cef449d1cd91f99a7

SHA1
920749ae8ccc910f01938f308205297b5644a8c4

SHA256
3289aedfb1ef5a7f045122efb2f14b5a4cdfc595bda429074e167d6b3785c271

SHA512
e899b6580e69a63a20be13c411d87a080bf1b7c2357f6f90ec565a48895a0e08b765004ccf60d4c3d35945d113f5caa98596eaf740b52cf29c0275db0efcf452

Download Submit
memory/1072-19-0x0000000001200000-0x0000000001205000-memory.dmp

Filesize
20KB

Download
memory/1072-20-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/1072-22-0x0000000001200000-0x0000000001205000-memory.dmp

Filesize
20KB

Download
memory/3660-0-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/3660-1-0x0000000002900000-0x0000000002905000-memory.dmp

Filesize
20KB

Download
memory/3660-8-0x0000000002A10000-0x0000000002A20000-memory.dmp

Filesize
64KB

Download
memory/3660-9-0x0000000002A20000-0x0000000002A25000-memory.dmp

Filesize
20KB

Download
memory/3660-10-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/3660-14-0x0000000002900000-0x0000000002905000-memory.dmp

Filesize
20KB

Download