51a129086b973f6bae1bed13d9baf7796be82f59e407fb5a59d3936a31830690

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
25/12/2023, 10:05

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General

Target

15f4b6ff3ff656fbe205618a25c5fc3c.dll
Size

236KB
MD5

15f4b6ff3ff656fbe205618a25c5fc3c
SHA1

d0c443afb91af5cd8bbd4bcebc1c9652f6622be9
SHA256

51a129086b973f6bae1bed13d9baf7796be82f59e407fb5a59d3936a31830690
SHA512

dcb9b6fbf5e2202592c30c4286eee51a5f03f85be886860398411c63b7cecd153144236d568411b4898786d0ce86106569bedfaa47959c1bd19867dfbde55392
SSDEEP

3072:SeqmgHwlaazN9U3J+P0wFp+bLrt2wkkIT:+Qj9U3jwO3rt5I

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\eks = "{8a87694d-020f-5754-1310-020fe1c5ee8b}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
2548	rundll32.exe

Drops file in System32 directory 4 IoCs

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

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}\InprocServer32\ = "C:\\Windows\\SysWow64\\zfn.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{8a87694d-020f-5754-1310-020fe1c5ee8b}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2548	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2548	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2548	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 3024 wrote to memory of 2548	3024	rundll32.exe	17
PID 3024 wrote to memory of 2548	3024	rundll32.exe	17
PID 3024 wrote to memory of 2548	3024	rundll32.exe	17
PID 3024 wrote to memory of 2548	3024	rundll32.exe	17
PID 3024 wrote to memory of 2548	3024	rundll32.exe	17
PID 3024 wrote to memory of 2548	3024	rundll32.exe	17
PID 3024 wrote to memory of 2548	3024	rundll32.exe	17

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\15f4b6ff3ff656fbe205618a25c5fc3c.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:3024
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\15f4b6ff3ff656fbe205618a25c5fc3c.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:2548

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

\Windows\SysWOW64\rxf.dll

Filesize
625KB

MD5
95e2376b3323f062eb562b8586d0f14a

SHA1
453d4c3bf4a489433b593420a37bbffb7749875a

SHA256
bd3fa8750123d00aa0967fba44372c46ea002681da9c9b77a4f9261553e26017

SHA512
b898603d07a49237e4dfc6872d5caa7616bae1258926f10e66c4d3f0d81cccefac1e844395b65bb1f308fbc022061b52e51f60658d0a546c04b365b3428cc87d

Download Submit
memory/2548-8-0x0000000076F80000-0x0000000077020000-memory.dmp

Filesize
640KB

Download
memory/2548-7-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download
memory/2548-10-0x0000000076F80000-0x0000000077020000-memory.dmp

Filesize
640KB

Download
memory/2548-9-0x0000000000400000-0x0000000000444000-memory.dmp

Filesize
272KB

Download