Query: rule covering Detects adding and using Exchange PowerShell snap-ins to export mailbox data. As seen used by HAFNIUM and APT27
Matching passage: Sigma rule: Detects adding and using Exchange PowerShell snap-ins to export mailbox data. As seen used by HAFNIUM and APT27. Logsource: windows / process_creation. Rule: title: Exchange PowerShell Snap-Ins Usage id: 25676e10-2121-446e-80a4-71ff8506af47 status: test description: Detects adding and using Exchange PowerShell snap-ins to export mailbox data. As seen used by HAFNIUM and APT27 references: - https://www.volexity.com/blog/2021/03/02/active-exploitation-of-microsoft-exchange-zero-day-vulnerabilities/ - https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/ - https://www.intrinsec.com/apt27-analysis/ author: FPT.EagleEye, Nasreddine Bencherchali (Nextron Systems) date: 2021-03-03 modified: 2023-03-24 tags: - attack.execution - attack.t1059.001 - attack.collection - attack.t1114 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \powershell.exe - \pwsh.exe - OriginalFileName: - PowerShell.EXE - pwsh.dll selection_cli: CommandLine|contains: Add-PSSnapin selection_module: CommandLine|contains: - Microsoft.Exchange.Powershell.Snapin - Microsoft.Exchange.Management.PowerShell.SnapIn filter_msiexec: ParentImage: C:\Windows\System32\msiexec.exe CommandLine|contains: $exserver=Get-ExchangeServer ([Environment]::MachineName) -ErrorVariable exerr 2> $null condition: all of selection_* and not 1 of filter_* falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: Detects the tampering of Hypervisor-protected Code Integrity (HVCI) related registry values via command line tool reg.ex. Logsource: windows / process_creation. Rule: title: Hypervisor-protected Code Integrity (HVCI) Related Registry Tampering Via CommandLine id: 6225c53a-a96e-4235-b28f-8d7997cd96eb related: - id: 8b7273a4-ba5d-4d8a-b04f-11f2900d043a type: similar status: experimental description: 'Detects the tampering of Hypervisor-protected Code Integrity (HVCI) related registry values via command line tool reg.exe. HVCI uses virtualization-based security to protect code integrity by ensuring that only trusted code can run in kernel mode. Adversaries may tamper with HVCI to load malicious or unsigned drivers, which can be used to escalate privileges, maintain persistence, or evade security mechanisms. ' references: - https://www.sophos.com/en-us/blog/sharpening-the-knife-gold-blades-strategic-evolution - https://learn.microsoft.com/en-us/windows/security/hardware-security/enable-virtualization-based-protection-of-code-integrity author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2026-01-26 tags: - attack.defense-impairment - attack.t1685 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \powershell.exe - \pwsh.exe - \reg.exe - OriginalFileName: - PowerShell.EXE - pwsh.dll - reg.exe selection_cli: CommandLine|contains: - 'add ' - 'New-ItemProperty ' - 'Set-ItemProperty ' - 'si ' selection_cli_base: CommandLine|contains: \DeviceGuard selection_cli_key: CommandLine|contains: - EnableVirtualizationBasedSecurity - HypervisorEnforcedCodeIntegrity condition: all of selection_* falsepositives: - Legitimate system administration tasks that require disabling HVCI for troubleshooting purposes when certain drivers or applications are incompatible with it. level: high regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_hvci_registry_tampering/info.yml simulation: - type: atomic-red-team name: Disable Hypervisor-Enforced Code Integrity (HVCI) technique: T1562.001 atomic_guid: 70bd71e6-eba4-4e00-92f7-617911dbe020