5a4def80e36a0b2e470b5e901ead4d4087457967e422cf5a0dd5b2d4b284dc90

Analysis

max time kernel
150s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
26/12/2023, 10:43

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General

Target

683cc4e29bed1421a4524e3579d58bd6.dll
Size

34KB
MD5

683cc4e29bed1421a4524e3579d58bd6
SHA1

10748bf254625dd22245ad603be82eb052db5638
SHA256

5a4def80e36a0b2e470b5e901ead4d4087457967e422cf5a0dd5b2d4b284dc90
SHA512

b7b16165f8446a5e5a317e65df52e7877b3e7b7cd528d787f02d43328d5da5a282ea04fad60e4313aa80516328d08d8c652544513d3d12e72d1576d302c4c3d6
SSDEEP

768:eiQQkZDTbBwI72tszyuwyrNJgYhyAM67Q5B6xqRv+N17kE7ukG:DQQkpXBwI72tszNwcMYsGqRa7ksuP

Score

7^/10

persistence

Malware Config

Signatures

Loads dropped DLL 3 IoCs

pid	Process
1420	rundll32.exe
1420	rundll32.exe
2184	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\\yayxurRH.dll,#1"	rundll32.exe

Drops file in System32 directory 2 IoCs

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

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}\InprocServer32\ThreadingModel = "Both"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}\InprocServer32\ = "C:\\Windows\\SysWow64\\yayxurRH.dll"	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
1420	rundll32.exe
1420	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe
2184	rundll32.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
1420	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1420	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1420	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 4372 wrote to memory of 1420	4372	rundll32.exe	88
PID 4372 wrote to memory of 1420	4372	rundll32.exe	88
PID 4372 wrote to memory of 1420	4372	rundll32.exe	88
PID 1420 wrote to memory of 624	1420	rundll32.exe	3
PID 1420 wrote to memory of 2184	1420	rundll32.exe	100
PID 1420 wrote to memory of 2184	1420	rundll32.exe	100
PID 1420 wrote to memory of 2184	1420	rundll32.exe	100

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:624

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\683cc4e29bed1421a4524e3579d58bd6.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:4372
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\683cc4e29bed1421a4524e3579d58bd6.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:1420
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Windows\system32\yayxurRH.dll,a
    3⤵
    - Loads dropped DLL
    - Adds Run key to start application
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    PID:2184

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\yayxurRH.dll

Filesize
34KB

MD5
683cc4e29bed1421a4524e3579d58bd6

SHA1
10748bf254625dd22245ad603be82eb052db5638

SHA256
5a4def80e36a0b2e470b5e901ead4d4087457967e422cf5a0dd5b2d4b284dc90

SHA512
b7b16165f8446a5e5a317e65df52e7877b3e7b7cd528d787f02d43328d5da5a282ea04fad60e4313aa80516328d08d8c652544513d3d12e72d1576d302c4c3d6

Download Submit
memory/1420-0-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1420-1-0x00000000004C0000-0x00000000004C5000-memory.dmp

Filesize
20KB

Download
memory/1420-2-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1420-10-0x0000000000840000-0x0000000000845000-memory.dmp

Filesize
20KB

Download
memory/1420-9-0x0000000000820000-0x0000000000834000-memory.dmp

Filesize
80KB

Download
memory/1420-11-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/1420-13-0x00000000004C0000-0x00000000004C5000-memory.dmp

Filesize
20KB

Download
memory/2184-19-0x0000000000850000-0x0000000000855000-memory.dmp

Filesize
20KB

Download
memory/2184-20-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/2184-21-0x0000000010000000-0x0000000010014000-memory.dmp

Filesize
80KB

Download
memory/2184-23-0x0000000000850000-0x0000000000855000-memory.dmp

Filesize
20KB

Download