Sigma Rules
13 rules found for "Marco Pedrinazzi (InTheCyber)"
Suspicious Email Delivered In Microsoft 365
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.
FortiGate - New Administrator Account Created
Detects the creation of an administrator account on a Fortinet FortiGate Firewall.
FortiGate - Firewall Address Object Added
Detects the addition of firewall address objects on a Fortinet FortiGate Firewall.
FortiGate - New Firewall Policy Added
Detects the addition of a new firewall policy on a Fortinet FortiGate Firewall.
FortiGate - New Local User Created
Detects the creation of a new local user on a Fortinet FortiGate Firewall. The new local user could be used for VPN connections.
FortiGate - New VPN SSL Web Portal Added
Detects the addition of a VPN SSL Web Portal on a Fortinet FortiGate Firewall. This behavior was observed in pair with modification of VPN SSL settings.
FortiGate - User Group Modified
Detects the modification of a user group on a Fortinet FortiGate Firewall. The group could be used to grant VPN access to a network.
FortiGate - VPN SSL Settings Modified
Detects the modification of VPN SSL Settings (for example, the modification of authentication rules). This behavior was observed in pair with the addition of a VPN SSL Web Portal.
System Language Discovery via Reg.Exe
Detects the usage of Reg.Exe to query system language settings. Attackers may discover the system language to determine the geographic location of victims, customize payloads for specific regions, or avoid targeting certain locales to evade detection.
Azure Sign-In With Axios User Agent
Detects sign-in attempts in Azure/Entra ID logs where the user agent contains "axios", indicating potential use of automated credential harvesting or AiTM phishing infrastructure. Axios is a Node.js HTTP client abused to intercept and replay stolen credentials and MFA tokens. When triaging results, analysts should: - Check the sign-in risk level, MFA status, and conditional access results for signs of bypass. - Look for sign-ins from unusual locations or IPs, especially if the same IP targets multiple accounts. - Prioritize successful sign-ins over failed ones, as they may indicate a completed credential replay or AiTM attack.
Inbox Rules Creation Or Update Activity in O365
Detects inbox rule creation or update via O365 Audit logs, a technique commonly observed in Business Email Compromise (BEC) attacks to hide emails. The usage of inbox rules can be a sign of a compromised mailbox, where an attacker is attempting to evade detections by suppressing or redirecting incoming emails. Analysts should review these rules in context, validate whether they reflect normal user behavior, and correlate with other indicators such as unusual login activity or recent mailbox rule modifications.
Mail Forwarding/Redirecting Activity Via ExchangePowerShell Cmdlet
Detects email forwarding or redirecting activity via ExchangePowerShell Cmdlet
Inbox Rules Creation Or Update Activity Via ExchangePowerShell Cmdlet
Detects inbox rule creation or update via ExchangePowerShell cmdlet, a technique commonly observed in Business Email Compromise (BEC) attacks to hide emails. The usage of inbox rules can be a sign of a compromised mailbox, where an attacker is attempting to evade detections by suppressing or redirecting incoming emails. Analysts should review these rules in context, validate whether they reflect normal user behavior, and correlate with other indicators such as unusual login activity or recent mailbox rule modifications.