Query: write Sigma for Detects instances where an email, identified as malicious or suspicious by the Microsoft Defender for Office 365 (former
Matching passage: Sigma rule: Detects instances where an email, identified as malicious or suspicious by the Microsoft Defender for Office 365 (former. Logsource: m365 / audit. Rule: title: Suspicious Email Delivered In Microsoft 365 id: 3569aefd-e535-4391-8c18-24bd01a21eaf status: experimental description: 'Detects instances where an email, identified as malicious or suspicious by the Microsoft Defender for Office 365 (formerly ATP) engine, was delivered to a user''s Inbox or Junk folder. It might indicate that a potential threat, such as a spearphishing attachment or links, has bypassed initial blocking mechanisms and reached an end-user, requiring further investigation and potential remediation. ' references: - https://learn.microsoft.com/en-us/defender-office-365/threat-explorer-real-time-detections-about - https://research.splunk.com/cloud/605cc93a-70e4-4ee3-9a3d-1a62e8c9b6c2/ - https://github.com/Bert-JanP/Hunting-Queries-Detection-Rules/blob/e7250648cb16d4a497ae8737943bf010ea96d2e6/Defender%20For%20Cloud%20Apps/MaliciousEmailDeliveredInMailbox.md author: Marco Pedrinazzi (@pedrinazziM) (InTheCyber) date: 2026-01-27 tags: - attack.initial-access - attack.t1566.001 - attack.t1566.002 logsource: service: audit product: m365 detection: selection: Workload: ThreatIntelligence Operation: TIMailData Directionality: Inbound filter_main_blocked: DeliveryAction: Blocked condition: selection and not 1 of filter_main_* falsepositives: - Unlikely level: medium
Near-miss passage: Sigma rule: Detects file access requests to crypto currency files by uncommon processes. Could indicate potential attempt of crypto. Logsource: windows / file_access. Rule: title: Access To Crypto Currency Wallets By Uncommon Applications id: f41b0311-44f9-44f0-816d-dd45e39d4bc8 status: test description: 'Detects file access requests to crypto currency files by uncommon processes. Could indicate potential attempt of crypto currency wallet stealing. ' references: - Internal Research author: X__Junior (Nextron Systems) date: 2024-07-29 tags: - attack.t1003 - attack.credential-access logsource: category: file_access product: windows definition: 'Requirements: Microsoft-Windows-Kernel-File ETW provider' detection: selection: - FileName|contains: - \AppData\Roaming\Ethereum\keystore\ - \AppData\Roaming\EthereumClassic\keystore\ - \AppData\Roaming\monero\wallets\ - FileName|endswith: - \AppData\Roaming\Bitcoin\wallet.dat - \AppData\Roaming\BitcoinABC\wallet.dat - \AppData\Roaming\BitcoinSV\wallet.dat - \AppData\Roaming\DashCore\wallet.dat - \AppData\Roaming\DogeCoin\wallet.dat - \AppData\Roaming\Litecoin\wallet.dat - \AppData\Roaming\Ripple\wallet.dat - \AppData\Roaming\Zcash\wallet.dat filter_main_system: Image: System filter_main_generic: Image|startswith: - C:\Program Files (x86)\ - C:\Program Files\ - C:\Windows\system32\ - C:\Windows\SysWOW64\ filter_optional_defender: Image|startswith: C:\ProgramData\Microsoft\Windows Defender\ Image|endswith: - \MpCopyAccelerator.exe - \MsMpEng.exe condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Antivirus, Anti-Spyware, Anti-Malware Software - Backup software - Legitimate software installed on partitions other than "C:\" - Searching software such as "everything.exe" level: medium