Analysis
- max time kernel
150s - max time network
155s - 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, 20:24
Behavioral task
behavioral1
Sample
a4840b8f2041f1fadf39b9e758a98dbc.exe
Resource
win7-20240220-en
windows7-x64
12 signatures
150 seconds
Behavioral task
behavioral2
Sample
a4840b8f2041f1fadf39b9e758a98dbc.exe
Resource
win10v2004-20240221-en
windows10-2004-x64
12 signatures
150 seconds
General
- Target a4840b8f2041f1fadf39b9e758a98dbc.exe
- Size 684KB
- Sample240225-y68dysbd27
- SHA256 f545fcf708c93a719ed15112949bbb278418bfbbddc5ede52b4ed85d1f26ecb9
- MD5 a4840b8f2041f1fadf39b9e758a98dbc
- SHA1 a95eb12a542ba5827ae8b861ce365de19d72548d
- SHA512 cb2ceb2380d182fe39f0159782313f00f0a54656418b702bec8ef5f5b220f756bc5e9f3e06159ec8caec5c3eca3961382eb6901f19d0796bde662fde00be62f2
- SSDEEP 12288:K9AFlAd0Z+89cxTGzO4AucTD8QP2lmFSrVs9LqnKzZw:oAQ6Zx9cxTmOrucTIEFSpOG
- MD5 SHA1 SHA512 SSDEEP
Score
10/10
Malware Config
Signatures
- Modifies WinLogon for persistence 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Windows\\Windupdt\\winupdate.exe" a4840b8f2041f1fadf39b9e758a98dbc.exe - Modifies firewall policy service 2 TTPs 3 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile explorer.exe Set value (int) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\EnableFirewall = "0" explorer.exe Set value (int) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\DisableNotifications = "0" explorer.exe - Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate a4840b8f2041f1fadf39b9e758a98dbc.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate explorer.exe - Adds Run key to start application 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1790404759-2178872477-2616469472-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windows\\Windupdt\\winupdate.exe" a4840b8f2041f1fadf39b9e758a98dbc.exe Set value (str) \REGISTRY\USER\S-1-5-21-1790404759-2178872477-2616469472-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windows\\Windupdt\\winupdate.exe" notepad.exe - Suspicious use of SetThreadContext 1 IoCs
description pid Process procid_target PID 2636 set thread context of 320 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 90 - Drops file in Windows directory 4 IoCs
description ioc Process File created C:\Windows\Windupdt\winupdate.exe a4840b8f2041f1fadf39b9e758a98dbc.exe File opened for modification C:\Windows\Windupdt\winupdate.exe a4840b8f2041f1fadf39b9e758a98dbc.exe File opened for modification C:\Windows\Windupdt\ a4840b8f2041f1fadf39b9e758a98dbc.exe File created C:\Windows\Windupdt\winupdate.exe notepad.exe - Checks processor information in registry 2 TTPs 8 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier a4840b8f2041f1fadf39b9e758a98dbc.exe Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 explorer.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString explorer.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier explorer.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier explorer.exe Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 a4840b8f2041f1fadf39b9e758a98dbc.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString a4840b8f2041f1fadf39b9e758a98dbc.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier a4840b8f2041f1fadf39b9e758a98dbc.exe - Enumerates system info in registry 2 TTPs 2 IoCs
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier a4840b8f2041f1fadf39b9e758a98dbc.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier explorer.exe - Suspicious use of AdjustPrivilegeToken 48 IoCs
description pid Process Token: SeIncreaseQuotaPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeSecurityPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeTakeOwnershipPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeLoadDriverPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeSystemProfilePrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeSystemtimePrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeProfSingleProcessPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeIncBasePriorityPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeCreatePagefilePrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeBackupPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeRestorePrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeShutdownPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeDebugPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeSystemEnvironmentPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeChangeNotifyPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeRemoteShutdownPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeUndockPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeManageVolumePrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeImpersonatePrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeCreateGlobalPrivilege 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: 33 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: 34 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: 35 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: 36 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe Token: SeIncreaseQuotaPrivilege 320 explorer.exe Token: SeSecurityPrivilege 320 explorer.exe Token: SeTakeOwnershipPrivilege 320 explorer.exe Token: SeLoadDriverPrivilege 320 explorer.exe Token: SeSystemProfilePrivilege 320 explorer.exe Token: SeSystemtimePrivilege 320 explorer.exe Token: SeProfSingleProcessPrivilege 320 explorer.exe Token: SeIncBasePriorityPrivilege 320 explorer.exe Token: SeCreatePagefilePrivilege 320 explorer.exe Token: SeBackupPrivilege 320 explorer.exe Token: SeRestorePrivilege 320 explorer.exe Token: SeShutdownPrivilege 320 explorer.exe Token: SeDebugPrivilege 320 explorer.exe Token: SeSystemEnvironmentPrivilege 320 explorer.exe Token: SeChangeNotifyPrivilege 320 explorer.exe Token: SeRemoteShutdownPrivilege 320 explorer.exe Token: SeUndockPrivilege 320 explorer.exe Token: SeManageVolumePrivilege 320 explorer.exe Token: SeImpersonatePrivilege 320 explorer.exe Token: SeCreateGlobalPrivilege 320 explorer.exe Token: 33 320 explorer.exe Token: 34 320 explorer.exe Token: 35 320 explorer.exe Token: 36 320 explorer.exe - Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 320 explorer.exe - Suspicious use of WriteProcessMemory 28 IoCs
description pid Process procid_target PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 3988 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 89 PID 2636 wrote to memory of 320 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 90 PID 2636 wrote to memory of 320 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 90 PID 2636 wrote to memory of 320 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 90 PID 2636 wrote to memory of 320 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 90 PID 2636 wrote to memory of 320 2636 a4840b8f2041f1fadf39b9e758a98dbc.exe 90
Processes
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C:\Users\Admin\AppData\Local\Temp\a4840b8f2041f1fadf39b9e758a98dbc.exe"C:\Users\Admin\AppData\Local\Temp\a4840b8f2041f1fadf39b9e758a98dbc.exe"1⤵
- Modifies WinLogon for persistence
- Checks BIOS information in registry
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2636 -
C:\Windows\SysWOW64\notepad.exenotepad2⤵
- Adds Run key to start application
- Drops file in Windows directory
PID:3988
-
-
C:\Windows\SysWOW64\explorer.exe"C:\Windows\SysWOW64\explorer.exe"2⤵
- Modifies firewall policy service
- Checks BIOS information in registry
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:320
-
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Create or Modify System Process
1Windows Service
1