Arnold Chan
@slazTrusted contributorCompletionist
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7,544 detections
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Detects modifications to the 'crond' daemon binary followed closely (within 5 minutes) by a restart or start command via common system management utilities. This behavior is highly indicative of potential persistence mechanisms where an adversary replaces a system binary with a malicious version.
This rule detects potential exploitation or unauthorized interaction with an HAProxy service. It correlates process execution on Linux systems involving the HAProxy PID file with subsequent network traffic containing the suspicious string 'writeservice_info' within a one-hour window.
This rule detects the presence of specific file hashes known to be associated with backdoored software builds, specifically related to recent supply chain compromises affecting South Korean software vendors (e.g., HAProxy builds). It monitors device file events, process initiation, and identity logon events to identify systems that have deployed, executed, or been accessed by these malicious binaries.
Detects network activity associated with the CurlRAT malware during its beaconing phase. The rule monitors for process command line arguments containing 'writeservice_info' or 'atd_get_system_info', which indicate the collection of system information, and correlates this with network connections that potentially transmit a ~10KB data payload characteristic of its check-in mechanism.
Detects the creation or modification of files within the /tmp directory that follow a specific naming convention (t[number]_w.pipe) by an HAProxy process. This pattern is often associated with inter-process communication or potential post-exploitation activity where HAProxy is leveraged to handle named pipes for malicious command execution or data redirection.
Detects network activity associated with the CurlRAT malware during its beaconing phase. The rule monitors for process command line arguments containing 'writeservice_info' or 'atd_get_system_info', which indicate the collection of system information, and correlates this with network connections that potentially transmit a ~10KB data payload characteristic of its check-in mechanism.
Detects the CurlRAT malware interactive shell behavior where legitimate Linux system daemons (atd, crond, agetty, polkitd) are trojanized or abused to execute shell commands with attacker-supplied network endpoints (IP:Port).
Detects the specific execution pattern associated with CurlRAT, where common Linux daemons (crond, atd, agetty, polkitd) perform an outbound network connection and subsequently spawn an interactive shell (sh, bash, dash) as the root user within a 5-minute window.
Detects high-frequency password reset or credential recovery attempts originating from a single source IP against multiple user accounts. This behavior is indicative of an automated enumeration or brute-force attack, potentially exploiting vulnerabilities such as the referenced CVE-2026-18963.
Detects attempts to modify internal PostgreSQL system catalog tables (pg_authid or pg_proc) to grant superuser privileges or alter authorization records. This activity is commonly associated with exploiting logical decoding plugins to achieve persistence or privilege escalation in PostgreSQL environments.
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