f99b4f7ffa681c40999635e7de51c57ab1a506064b1234ef0d855642f6ddf686

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20240221-en
resource tags

arch:x64arch:x86image:win10v2004-20240221-enlocale:en-usos:windows10-2004-x64system
submitted
25/02/2024, 13:35

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

a3ea63c1c389918d7f4dcb8b9b86be36.dll
Size

37KB
MD5

a3ea63c1c389918d7f4dcb8b9b86be36
SHA1

7489370b48105daf7e01e1ee39016c2aa8c19fe5
SHA256

f99b4f7ffa681c40999635e7de51c57ab1a506064b1234ef0d855642f6ddf686
SHA512

1c7cc6ff8960b0d73519fe9fdfd64d1bc009259ac7e4f5fc27e8222d6284a9cce00168f14979aa4c478105d5423172277cbae70fbe2edb1ec9e88845fc774bdd
SSDEEP

768:VcQAxkfTI51j117xGL06Rx/hythQKOwzt5GPA7wJdMNP:J1LIPxiRRhOQnwzt5mJdMB

Score

7^/10

persistence

Malware Config

Signatures

Loads dropped DLL 3 IoCs

pid	Process
4860	rundll32.exe
4860	rundll32.exe
4136	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\\wvUnMfcY.dll,#1"	rundll32.exe

Drops file in System32 directory 2 IoCs

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

Modifies registry class 4 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BE45F323-53BF-45D5-A73A-358DDFA2E3EB}\InprocServer32	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BE45F323-53BF-45D5-A73A-358DDFA2E3EB}\InprocServer32\ = "C:\\Windows\\SysWow64\\wvUnMfcY.dll"	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BE45F323-53BF-45D5-A73A-358DDFA2E3EB}\InprocServer32\ThreadingModel = "Both"	rundll32.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{BE45F323-53BF-45D5-A73A-358DDFA2E3EB}	rundll32.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4860	rundll32.exe
4860	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe
4136	rundll32.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
4860	rundll32.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4860	rundll32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4860	rundll32.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 1460 wrote to memory of 4860	1460	rundll32.exe	85
PID 1460 wrote to memory of 4860	1460	rundll32.exe	85
PID 1460 wrote to memory of 4860	1460	rundll32.exe	85
PID 4860 wrote to memory of 628	4860	rundll32.exe	7
PID 4860 wrote to memory of 4136	4860	rundll32.exe	95
PID 4860 wrote to memory of 4136	4860	rundll32.exe	95
PID 4860 wrote to memory of 4136	4860	rundll32.exe	95

C:\Windows\system32\winlogon.exe
winlogon.exe
1⤵
PID:628

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\a3ea63c1c389918d7f4dcb8b9b86be36.dll,#1
1⤵
- Suspicious use of WriteProcessMemory
PID:1460
- C:\Windows\SysWOW64\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\a3ea63c1c389918d7f4dcb8b9b86be36.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:4860
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Windows\system32\wvUnMfcY.dll,a
    3⤵
    - Loads dropped DLL
    - Adds Run key to start application
    - Modifies registry class
    - Suspicious behavior: EnumeratesProcesses
    PID:4136

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

Loading Replay Monitor...

Downloads

C:\Windows\SysWOW64\wvUnMfcY.dll

Filesize
37KB

MD5
a3ea63c1c389918d7f4dcb8b9b86be36

SHA1
7489370b48105daf7e01e1ee39016c2aa8c19fe5

SHA256
f99b4f7ffa681c40999635e7de51c57ab1a506064b1234ef0d855642f6ddf686

SHA512
1c7cc6ff8960b0d73519fe9fdfd64d1bc009259ac7e4f5fc27e8222d6284a9cce00168f14979aa4c478105d5423172277cbae70fbe2edb1ec9e88845fc774bdd

Download Submit
memory/4136-17-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/4136-18-0x0000000001120000-0x0000000001126000-memory.dmp

Filesize
24KB

Download
memory/4136-19-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/4860-0-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/4860-1-0x0000000000600000-0x0000000000606000-memory.dmp

Filesize
24KB

Download
memory/4860-8-0x0000000000680000-0x0000000000690000-memory.dmp

Filesize
64KB

Download
memory/4860-9-0x00000000007D0000-0x00000000007D6000-memory.dmp

Filesize
24KB

Download
memory/4860-10-0x0000000010000000-0x0000000010010000-memory.dmp

Filesize
64KB

Download
memory/4860-14-0x0000000000600000-0x0000000000606000-memory.dmp

Filesize
24KB

Download