Lacey Cochrane
@NullVectorXUSTrusted contributorCompletionist
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Detects new app installations, expansions of OAuth scopes, or the addition of collaborators to Slack applications. These activities can indicate an adversary attempting to establish persistent access, escalate privileges, or exfiltrate data from Slack by leveraging malicious or compromised applications.
Okta Impossible Travel Detection
Cortex XDR
Detects when a single user successfully authenticates to Okta from two different countries within a two-hour window, indicating potential impossible travel which could be a sign of a compromised account.
This rule processes Microsoft Graph Security Alerts, aggregating evidence from various Microsoft Defender products (MDE, MDI, MDCA, MDO, Entra ID Protection). It extracts and normalizes detailed evidence related to devices, users, IP addresses, processes, files, URLs, emails, mailboxes, network connections, and Azure resources, providing a comprehensive view of security incidents across the Microsoft ecosystem.
Detects the deployment of MeshCentral remote access agents and the creation of a specific ransom note file on compromised PeopleSoft servers, indicative of ShinyHunters activity. The rule looks for the creation of a file named 'README-IF-YOU-SEE-THIS-YOUVE-BEEN-HACKED.TXT' or the execution of 'meshagent' or 'meshcentral' processes from suspicious directories or initiated by common shell/download utilities.
Detects when an actor searches Slack audit logs, which could indicate an attacker attempting to understand logging capabilities or evade detection. Also detects bulk session resets initiated by an administrator, which may be a response to an account takeover or an attacker attempting to evict legitimate users from their sessions.
Detects the specific ShinyHunters lateral movement pattern involving automated SSH credential spraying using 'sshpass' or rapid SSH connections to multiple hosts with PeopleSoft admin accounts, often after reading '/etc/hosts' for target identification. The rule looks for multiple SSH connections within a 10-minute window from a single host and user, specifically targeting common PeopleSoft-related usernames.
Detects attempts to abuse the device code flow targeting Microsoft Office and Authentication Broker applications from unmanaged and non-compliant devices with unbound tokens. This activity is indicative of device code phishing, where an attacker tricks a user into authenticating a malicious application.
Detects network connections to known ShinyHunters infrastructure, including specific IP addresses and DNS queries for 'azurenetfiles.net', which has been linked to their operations targeting Oracle PeopleSoft servers via gadget chain exploitation.
Okta MFA Push Bombing / Fatigue
Cortex XDR
Detects repeated push denials for the same user within a short timeframe, indicating an active MFA fatigue attack where an adversary is attempting to overwhelm a user with MFA requests in hopes they will eventually approve one.
Detects high volume Google Cloud Storage (GCS) object listing and downloads, which can indicate reconnaissance of cloud storage contents or data exfiltration. The rule aggregates operations by identity, bucket, and project ID over a one-hour period and flags activity exceeding 50 total operations.
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