e8ce37ce99bae767df41c26f308bc9100b2074bb54d06af81706356cbcb2f434

Analysis

max time kernel
98s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20231222-en
resource tags

arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
submitted
24/12/2023, 15:14

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General

Target
03482a7cae3d747392da697c2d04d281.dll
Size 236KB
Sample231224-smjnlaeff4
SHA256 e8ce37ce99bae767df41c26f308bc9100b2074bb54d06af81706356cbcb2f434
MD5 03482a7cae3d747392da697c2d04d281
SHA1 2fc5b184b3180ae0e46c99781932bc37a75e06dd
SHA512 4a426c9ac387708b43a839a688acc868b59c54a09a0a66f52d27ebc6d302ad8909c36e49a5b73a2e43fb65f6d8976ba324b01557aaac98ad8fd455688309406f
SSDEEP 1536:1dKaTHN2ymZ0ofa5uQm4V7HG8ldINh+RhFtFftCgpcGO5lPf/XG8GmGwktbE:1Y4tIQG8XAmbFfaGc1fawk1E
MD5 SHA1 SHA512 SSDEEP

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\efkaysfjq = "{c9a4a699-412c-9671-523d-412c2e11089a}"	rundll32.exe

Loads dropped DLL 1 IoCs

pid	Process
744	rundll32.exe

Drops file in System32 directory 4 IoCs

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

Modifies registry class 5 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}\	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}\InprocServer32\ = "C:\\Windows\\SysWow64\\zafvtnael.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{c9a4a699-412c-9671-523d-412c2e11089a}\InprocServer32\ThreadingModel = "Apartment"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
744	rundll32.exe
744	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	744	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
744	rundll32.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 4840 wrote to memory of 744	4840	rundll32.exe	88
PID 4840 wrote to memory of 744	4840	rundll32.exe	88
PID 4840 wrote to memory of 744	4840	rundll32.exe	88

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\03482a7cae3d747392da697c2d04d281.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4840
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\03482a7cae3d747392da697c2d04d281.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:744

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

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Downloads

rsxnlfswd.dll

Path C:\Windows\SysWOW64\rsxnlfswd.dll
Size 478KB
SHA256 768c286674371564b5e6095edb56e0a4231f341be895da69cfccca5160029774
MD5 e99416267b61f52fa5ab994019efd359
SHA1 86d31eae707db7fe51d2556394fcf0e8e9f6b0fd
SHA512 0a1c7579a9c787c2c1bef35f0660e72e74b42824e14ebea63b87ed25ddaf107e3746567bb431cab41a2f6719fad2c22d96e0715a1fe085d75805d7d66f7f05ae
SSDEEP 12288:HIrZjxkFh7p/y4W0fPcdZ7cae7J/XoWwsNJ6Ir:HIrZjxw9y4WSPucaeFXoWwsNJ6Ir
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/744-5-0x0000000000400000-0x0000000000444000-memory.dmp

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memory/744-7-0x0000000075DB0000-0x0000000075E2A000-memory.dmp

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memory/744-10-0x0000000000400000-0x0000000000444000-memory.dmp

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memory/744-11-0x0000000075DB0000-0x0000000075E2A000-memory.dmp

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