3dbd806ba5ad7f52b288063f6e3b99c1cb23136f5844d7cf2c30a4d2b9798536

Analysis

max time kernel
93s
max time network
125s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
03/08/2024, 02:06

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General

Target

81d450a4b1dfb2545e35540675abfe24.dll
Size

236KB
MD5

81d450a4b1dfb2545e35540675abfe24
SHA1

de719ad26ccb1e1b4b1866117a808ef1763011b1
SHA256

3dbd806ba5ad7f52b288063f6e3b99c1cb23136f5844d7cf2c30a4d2b9798536
SHA512

5ce041764ca70cd5d106af80c113cd2d2cd54ef2f972cc2ef82dfad068caf5dd3db0165f866b742b09896d8f96ff45331a5043f0c3bd732f836353d091d7629a
SSDEEP

3072:SeqmgHwlaazN9U3J+P0wFp+bLrt2wkkIa:+Qj9U3jwO3rt5h

Score

10^/10

discovery 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\zsi = "{9ae25d6d-126a-67bf-237b-126ad5e500b3}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
3288	rundll32.exe

Drops file in System32 directory 4 IoCs

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

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

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{9ae25d6d-126a-67bf-237b-126ad5e500b3}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{9ae25d6d-126a-67bf-237b-126ad5e500b3}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{9ae25d6d-126a-67bf-237b-126ad5e500b3}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{9ae25d6d-126a-67bf-237b-126ad5e500b3}\InprocServer32\ = "C:\\Windows\\SysWow64\\und.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{9ae25d6d-126a-67bf-237b-126ad5e500b3}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3288	rundll32.exe
3288	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3288	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3288	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1168 wrote to memory of 3288	1168	rundll32.exe	82
PID 1168 wrote to memory of 3288	1168	rundll32.exe	82
PID 1168 wrote to memory of 3288	1168	rundll32.exe	82

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\81d450a4b1dfb2545e35540675abfe24.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1168
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\81d450a4b1dfb2545e35540675abfe24.dll,#1
  2⤵
  - Adds autorun key to be loaded by Explorer.exe on startup
  - Loads dropped DLL
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:3288

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\mfv.dll

Filesize
478KB

MD5
e99416267b61f52fa5ab994019efd359

SHA1
86d31eae707db7fe51d2556394fcf0e8e9f6b0fd

SHA256
768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774

SHA512
0a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae

Download Submit
memory/3288-0-0x0000000000401000-0x0000000000408000-memory.dmp

Filesize
28KB

Download
memory/3288-9-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/3288-10-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/3288-11-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download