Resubmissions
14/06/2024, 10:47
240614-mvyvlaxdja1014/06/2024, 10:47
240614-mvm34a1dlk1014/06/2024, 10:45
240614-mthf8a1cpk10Analysis
- max time kernel
25s - max time network
29s - platform
windows11-21h2_x64 - resource
win11-20240611-en - resource tags
arch:x64arch:x86image:win11-20240611-enlocale:en-usos:windows11-21h2-x64system - submitted
14/06/2024, 10:45
Static task
static1
Behavioral task
behavioral1
Sample
Annabelle.exe
Resource
win11-20240611-en
Errors
General
- Target Annabelle.exe
- Size 15.9MB
- Sample240614-mthf8a1cpk
- SHA256 716335ba5cd1e7186c40295b199190e2b6655e48f1c1cbe12139ba67faa5e1ac
- MD5 0f743287c9911b4b1c726c7c7edcaf7d
- SHA1 9760579e73095455fcbaddfe1e7e98a2bb28bfe0
- SHA512 2a6dd6288303700ef9cb06ae1efeb1e121c89c97708e5ecd15ed9b2a35d0ecff03d8da58b30daeadad89bd38dc4649521ada149fb457408e5a2bdf1512f88677
- SSDEEP 393216:UMwm0qBknxdEX+LbMUgoSZmWSmh4aaRN22ChHCMNku1y:UMcKX+Lbjgd7W1RNVC9ku1
- MD5 SHA1 SHA512 SSDEEP
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\Shell = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Annabelle.exe" Annabelle.exe -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection Annabelle.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableRealtimeMonitoring = "1" Annabelle.exe -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" Annabelle.exe - Deletes shadow copies 3 TTPs
Ransomware often targets backup files to inhibit system recovery.
- Disables RegEdit via registry modification 2 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" Annabelle.exe Set value (int) \REGISTRY\USER\S-1-5-21-1560405787-796225086-678739705-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" Annabelle.exe - Disables Task Manager via registry modification
- Disables use of System Restore points 1 TTPs
- Modifies Windows Firewall 2 TTPs 1 IoCs
pid Process 4584 NetSh.exe - Sets file execution options in registry 2 TTPs 64 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\shellstyle.dll Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\recoverydrive.exe Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msconfig.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\opera.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bcdedit.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\systemexplorer.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\DCIMAN32.exe Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rasman.dll Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\cmd.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MSASCuiL.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mmc.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bcdedit.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\dllhost.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MSASCuiL.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\gpedit.msc Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UserAccountControlSettings.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\secpol.msc Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\logoff.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\powershell.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\sethc.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ksuser.dll\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mmc.exe Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\UserAccountControlSettings.exe Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Autoruns64.exe Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mspaint.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\wmplayer.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msconfig.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chrome.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\microsoftedgecp.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mydocs.dll\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\usbui.dll Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\usbui.dll\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\secpol.msc\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\microsoftedge.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Autoruns64.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\yandex.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\attrib.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rundll.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chkdsk.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mpg4dmod.dll Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\notepad.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\gpedit.msc\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\url.dll\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rundll32.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\control.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\firefox.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\microsoftedgecp.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\notepad++.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\sethc.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\webcheck.dll\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\cmd.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Autoruns.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskkill.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mspaint.exe\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\dllhost.exe Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chkdsk.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\DBGHELP.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mpg4dmod.dll\Debugger = "RIP" Annabelle.exe Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\chrome.exe Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\microsoftedge.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\iexplore.exe\Debugger = "RIP" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\recoverydrive.exe\Debugger = "RIP" Annabelle.exe - Adds Run key to start application 2 TTPs 3 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\UpdateBackup = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Annabelle.exe" Annabelle.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\UpdateBackup = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Annabelle.exe" Annabelle.exe Set value (str) \REGISTRY\USER\S-1-5-21-1560405787-796225086-678739705-1000\Software\Microsoft\Windows\CurrentVersion\Run\UpdateBackup = "C:\\Users\\Admin\\AppData\\Local\\Temp\\Annabelle.exe" Annabelle.exe -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" Annabelle.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Interacts with shadow copies 2 TTPs 3 IoCs
Shadow copies are often targeted by ransomware to inhibit system recovery.
pid Process 3948 vssadmin.exe 1088 vssadmin.exe 3508 vssadmin.exe - Modifies data under HKEY_USERS 15 IoCs
description ioc Process Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292114432" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365268" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365268" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" LogonUI.exe Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4290799360" LogonUI.exe Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = 99ebff004cc2ff000091f8000078d4000067c000003e9200001a6800f7630c00 LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292114432" LogonUI.exe Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "217" LogonUI.exe - Suspicious use of AdjustPrivilegeToken 5 IoCs
description pid Process Token: SeBackupPrivilege 4488 vssvc.exe Token: SeRestorePrivilege 4488 vssvc.exe Token: SeAuditPrivilege 4488 vssvc.exe Token: SeShutdownPrivilege 4540 shutdown.exe Token: SeRemoteShutdownPrivilege 4540 shutdown.exe - Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 5040 LogonUI.exe - Suspicious use of WriteProcessMemory 10 IoCs
description pid Process procid_target PID 4256 wrote to memory of 3948 4256 Annabelle.exe 77 PID 4256 wrote to memory of 3948 4256 Annabelle.exe 77 PID 4256 wrote to memory of 3508 4256 Annabelle.exe 78 PID 4256 wrote to memory of 3508 4256 Annabelle.exe 78 PID 4256 wrote to memory of 1088 4256 Annabelle.exe 79 PID 4256 wrote to memory of 1088 4256 Annabelle.exe 79 PID 4256 wrote to memory of 4584 4256 Annabelle.exe 80 PID 4256 wrote to memory of 4584 4256 Annabelle.exe 80 PID 4256 wrote to memory of 4540 4256 Annabelle.exe 87 PID 4256 wrote to memory of 4540 4256 Annabelle.exe 87 - System policy modification 1 TTPs 9 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System Annabelle.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\WindowsDefenderMAJ = "1" Annabelle.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableTaskMgr = "1" Annabelle.exe Key created \REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer Annabelle.exe Key created \REGISTRY\MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System Annabelle.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" Annabelle.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoControlPanel = "1" Annabelle.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoRun = "1" Annabelle.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1" Annabelle.exe - Uses Volume Shadow Copy service COM API
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
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C:\Users\Admin\AppData\Local\Temp\Annabelle.exe"C:\Users\Admin\AppData\Local\Temp\Annabelle.exe"1⤵
- Modifies WinLogon for persistence
- Modifies Windows Defender Real-time Protection settings
- UAC bypass
- Disables RegEdit via registry modification
- Sets file execution options in registry
- Adds Run key to start application
- Checks whether UAC is enabled
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4256 -
C:\Windows\SYSTEM32\vssadmin.exevssadmin delete shadows /all /quiet2⤵
- Interacts with shadow copies
PID:3948
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C:\Windows\SYSTEM32\vssadmin.exevssadmin delete shadows /all /quiet2⤵
- Interacts with shadow copies
PID:3508
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C:\Windows\SYSTEM32\vssadmin.exevssadmin delete shadows /all /quiet2⤵
- Interacts with shadow copies
PID:1088
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C:\Windows\SYSTEM32\NetSh.exeNetSh Advfirewall set allprofiles state off2⤵
- Modifies Windows Firewall
PID:4584
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C:\Windows\System32\shutdown.exe"C:\Windows\System32\shutdown.exe" -r -t 00 -f2⤵
- Suspicious use of AdjustPrivilegeToken
PID:4540
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C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
PID:4488
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C:\Windows\system32\LogonUI.exe"LogonUI.exe" /flags:0x4 /state0:0xa3a0b855 /state1:0x41c64e6d1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:5040
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
3Registry Run Keys / Startup Folder
2Winlogon Helper DLL
1Create or Modify System Process
2Windows Service
2Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
3Registry Run Keys / Startup Folder
2Winlogon Helper DLL
1Create or Modify System Process
2Windows Service
2