62bcfc7301c5e4fa40e052c20696efcf7adbdafc685e4141747ca6971f7dfb90

Analysis

max time kernel
120s
max time network
96s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
07-09-2024 10:23

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General

Target

bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
Size

211KB
MD5

bef7cb55b42d2eefbc137b0e1cc8cf70
SHA1

298e292afb2ccc5103e846bb05bd1bbcc75d78bb
SHA256

62bcfc7301c5e4fa40e052c20696efcf7adbdafc685e4141747ca6971f7dfb90
SHA512

7d766f90e7f36f256268965dca4edbb4d7f3fd04e029fd1f2e57d0f0fee0f26a9e7e497d0946951a1c115cb74425ae55afda887a1ae7a26d29221b5608765bb8
SSDEEP

3072:bDpM9Nvih5c9DE1pvAPXIHLfMgw7ySBL8PEAjAfIbAYGPJz6sPJBINFZ1FqnF:b1iNKQxENHLfMgw7y9ZrK

Score

10^/10

discovery evasion persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\userinit.exe"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\shell = "C:\\Windows\\explorer.exe, c:\\windows\\userinit.exe"	swchost.exe

Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs

evasion

Hidden Files and Directories

T1564.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	userinit.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0"	swchost.exe

Boot or Logon Autostart Execution: Active Setup 2 TTPs 8 IoCs

Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

persistence

Active Setup

T1547.014

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	swchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	swchost.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	swchost.exe
Key deleted	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	swchost.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Active Setup\Installed Components\{Y479C6D0-OTRW-U5GH-S1EE-E0AC10B4E666}\StubPath = "C:\\Users\\Admin\\AppData\\Local\\mrsys.exe MR"	userinit.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Active Setup\Installed Components\{F146C9B1-VMVQ-A9RC-NUFL-D0BA00B4E999}	swchost.exe

Executes dropped EXE 4 IoCs

pid	Process
2592	userinit.exe
4520	spoolsw.exe
960	swchost.exe
3148	spoolsw.exe

Adds Run key to start application 2 TTPs 4 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\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Swchost = "c:\\windows\\swchost.exe RO"	swchost.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\userinit = "c:\\windows\\userinit.exe RO"	userinit.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\RunOnce\Swchost = "c:\\windows\\swchost.exe RO"	userinit.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\udsys.exe	userinit.exe

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	\??\c:\windows\userinit.exe	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
File opened for modification	\??\c:\windows\spoolsw.exe	userinit.exe
File opened for modification	\??\c:\windows\swchost.exe	spoolsw.exe
File opened for modification	\??\c:\windows\userinit.exe	userinit.exe
File opened for modification	\??\c:\windows\swchost.exe	swchost.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 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	userinit.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	swchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	spoolsw.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
2276	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
2276	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
2592	userinit.exe
2592	userinit.exe
2592	userinit.exe
2592	userinit.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe
2592	userinit.exe
2592	userinit.exe
960	swchost.exe
960	swchost.exe

Suspicious behavior: GetForegroundWindowSpam 2 IoCs

pid	Process
2592	userinit.exe
960	swchost.exe

Suspicious use of SetWindowsHookEx 12 IoCs

pid	Process
2276	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
2276	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
2592	userinit.exe
2592	userinit.exe
4520	spoolsw.exe
4520	spoolsw.exe
960	swchost.exe
960	swchost.exe
3148	spoolsw.exe
3148	spoolsw.exe
2592	userinit.exe
2592	userinit.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2276 wrote to memory of 2592	2276	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe	84
PID 2276 wrote to memory of 2592	2276	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe	84
PID 2276 wrote to memory of 2592	2276	bef7cb55b42d2eefbc137b0e1cc8cf70N.exe	84
PID 2592 wrote to memory of 4520	2592	userinit.exe	85
PID 2592 wrote to memory of 4520	2592	userinit.exe	85
PID 2592 wrote to memory of 4520	2592	userinit.exe	85
PID 4520 wrote to memory of 960	4520	spoolsw.exe	87
PID 4520 wrote to memory of 960	4520	spoolsw.exe	87
PID 4520 wrote to memory of 960	4520	spoolsw.exe	87
PID 960 wrote to memory of 3148	960	swchost.exe	88
PID 960 wrote to memory of 3148	960	swchost.exe	88
PID 960 wrote to memory of 3148	960	swchost.exe	88

C:\Users\Admin\AppData\Local\Temp\bef7cb55b42d2eefbc137b0e1cc8cf70N.exe
"C:\Users\Admin\AppData\Local\Temp\bef7cb55b42d2eefbc137b0e1cc8cf70N.exe"
1⤵
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2276
- \??\c:\windows\userinit.exe
  c:\windows\userinit.exe
  2⤵
  - Modifies WinLogon for persistence
  - Modifies visiblity of hidden/system files in Explorer
  - Boot or Logon Autostart Execution: Active Setup
  - Executes dropped EXE
  - Adds Run key to start application
  - Drops file in System32 directory
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2592
- - \??\c:\windows\spoolsw.exe
    c:\windows\spoolsw.exe SE
    3⤵
    - Executes dropped EXE
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4520
  - - \??\c:\windows\swchost.exe
      c:\windows\swchost.exe
      4⤵
      Modifies WinLogon for persistence
      Modifies visiblity of hidden/system files in Explorer
      Boot or Logon Autostart Execution: Active Setup
      Executes dropped EXE
      Adds Run key to start application
      Drops file in Windows directory
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: GetForegroundWindowSpam
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:960
    - - \??\c:\windows\spoolsw.exe
        
        c:\windows\spoolsw.exe PR
        5⤵
        Executes dropped EXE
        System Location Discovery: System Language Discovery
        Suspicious use of SetWindowsHookEx
        
        PID:3148

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Active Setup

T1547.014

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\mrsys.exe

Filesize
211KB

MD5
c30de2bea68ff3c80ec75f007511cbb9

SHA1
16f8dbe585ecd495219a672539b0409425b678b3

SHA256
bb65d3d6d5f66ca9471d81e3003669e923d0e28ca7cb0d09ac78621ed2d10a09

SHA512
01ba66b798ba492eee954f41f6cb66370f27b8b95f1c6e1f5c8341e0bd12d1bb0adbb4fa2f24ec24f0855a39141c525cbed14df034f11beb30d60b2fc514b2f9

Download Submit
C:\Windows\spoolsw.exe

Filesize
211KB

MD5
6b961c5c97d770a20075445f014d9fef

SHA1
5b4c3b98c608c4d3ce9769e65b545e3f8e904810

SHA256
cb3267bd9d37d16fe935faa443a565f3ebc7a76e221459f66e25bfea40b73235

SHA512
6e6e37e75d07930ca2e074708f32c47abca889edfd167deaf73dad8eb05c2ee1c45bda6c1896545dee83affd750b7d178e85e7222eef1f9059eb93d8dd0efe2e

Download Submit
C:\Windows\swchost.exe

Filesize
211KB

MD5
4fa3dff955e3fc4a5a8bda7aca9fa5ab

SHA1
222b6e375cc2b26682c836cf6d61b85ac885ba86

SHA256
1d6b59377e3c953ab60a2439703c7823d3ad9dedb46e9b9df8ae60a45c0ee477

SHA512
564645a12b1f0e9b3a953c8561d4073ae7d18a91d94aba05fa01deeefcebcdff3b8ce24c853a65ab3a82249ae2e426fde4fecb347d2da5aa3d48e55c62f6521a

Download Submit
C:\Windows\userinit.exe

Filesize
211KB

MD5
806d06aba3dff6cf6dc70179111a5b51

SHA1
8e00b62e79622bc835a737610178fb41232d2df1

SHA256
fde20414e65936b248de093e6310e96797f492706410b94974ce0b0912b2b2ce

SHA512
97603365e64eb51afd0cab3c46a4859281ec894b9e9bcdb30dc7090093dcdab5c0674106ddf1b06f7390639a543540b58cf4196ae551777d27e17b22a5c91445

Download Submit