SigmaHQ Detections
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This rule identifies user activity originating from an IP address that has been flagged as an anonymous proxy. Such activity can indicate an attempt to obscure the true origin of a sign-in, which is often associated with malicious intent like credential stuffing, account takeover, or bypassing geographical restrictions.
This rule detects sign-in attempts originating from IP addresses identified as malicious by Azure AD Identity Protection, specifically when these attempts are characterized by a high failure rate. This indicates potential brute-force attacks, credential stuffing, or other unauthorized access attempts from known bad IP addresses.
Detects the use of the 'steghide' binary with the 'embed' command and specific flags ('-cf' or '-ef') to hide files using steganography. This technique can be used by adversaries to embed malicious payloads or sensitive data within legitimate-looking files, such as images, to evade detection.
Detects disabling security tools
Detects the creation of shell scripts (files ending with .csh or .sh) within the '/etc/profile.d/' directory. This directory is used to store shell scripts that are executed when a user logs in, making it a common target for adversaries to establish persistence or elevate privileges.
Detects the use of the 'wget' utility to download and create files within common temporary directories like '/tmp' or '/var/tmp' on Linux systems. This activity can be indicative of an adversary performing ingress tool transfer or staging malicious files.
This rule detects the usage of common macOS command-line utilities for file and directory discovery. Specifically, it looks for executions of '/usr/bin/file' with a very long command line (potentially indicating wildcard usage), '/bin/ls' with the recursive flag '-R', and direct executions of '/usr/bin/find' and '/usr/bin/mdfind'. It also includes a generic detection for '/tree' which might be a custom or less common utility for directory listing.
This rule detects HTTP PUT requests where the User-Agent header contains 'WebDAV' and the destination IP address is not a private or loopback address. This activity could indicate an attempt to exfiltrate data to an external WebDAV share.
Detects the use of a specific default username, 'thisisnotvaliduser', during an interactive logon (LogonType 9) event (EventID 4624) on a Windows system. This specific username is associated with the DiagTrackEoP Proof-of-Concept (POC) for privilege escalation.
This detection identifies suspicious access attempts to registry keys and sub-keys associated with Azure AD Health service agents, such as AD FS. Gaining access to this information could enable an adversary to abuse features provided by these cloud services, particularly federation. The rule requires specific System Access Control List (SACL) auditing to be configured on 'HKLM:\SOFTWARE\Microsoft\ADHealthAgent' with propagation to sub-keys.
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