Daniel Jeremiah
@daniyyellUnited KingdomTrusted contributorCompletionist
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978 detections
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Detects a module changing protocol, destination class, or cloud service after repeated failed connections on its primary channel. This behavior is indicative of malware like Kazuar attempting to establish C2 communication through alternative means when its initial attempts fail.
Detects a persistent process creating similarly sized outbound transfers at regular intervals after staging local results, indicative of the Kazuar malware's exfiltration behavior. The rule identifies processes with significant outbound network traffic (bytes > 10000), aggregates this traffic over 15-minute intervals, and then looks for processes that exhibit consistent outbound activity with intervals between 10 and 20 minutes (600 to 1200 seconds).
Detects PHP or web server processes launching tools commonly used to download or upload files. This activity can indicate a web shell or other compromise where an attacker is attempting to transfer files to or from the compromised server. Investigate the transferred destination, remote endpoint, and whether the activity occurred during an approved deployment.
Detects PHP or web server processes launching common system, account, network, and domain reconnaissance utilities. This activity is often indicative of post-compromise internal reconnaissance, as web-facing application processes should not normally start these utilities. The rule specifically looks for processes like php.exe, w3wp.exe, httpd.exe, apache2, and nginx spawning reconnaissance tools such as whoami, hostname, systeminfo, ipconfig, ifconfig, net, nltest, dsquery, quser, and query.
This rule correlates the modification of 'Upgrade.php' with subsequent changes to REDCap authentication, login, or hook-related PHP files on the same device within a 30-minute window. This activity is indicative of the INFINITERED threat actor's technique to intercept the REDCap upgrade process and reinject credential harvesting, backdoor, and persistence code into new software versions. Such a sequence should be compared with approved maintenance windows and expected deployment activity to identify malicious behavior.
Detects files or processes matching SHA256 indicators published by Google Threat Intelligence Group for the INFINITERED campaign. The hashes cover the help.php persistence component, credential harvesters, backdoors, and droppers. A match should be treated as a high-confidence indicator of compromise and investigated immediately.
Detects copying executables, scripts, or archives to a remote C$ share immediately before remote execution. This behavior is associated with the 'Gentlemen Ransomware' as described in the referenced Microsoft blog.
Detects Discord Update.exe launching Discord through the processStart switch when started by an unusual parent. This behavior is indicative of potential malware, such as VVS Stealer, which might replace Discord core files and then use this method to load injected JavaScript into a fresh application session.
Detects PowerShell downloading an archive and expanding it into a user-writable directory with mining-related filenames or parameters. This behavior is indicative of cryptojacking campaigns where adversaries use compromised systems to mine cryptocurrency.
Detects a miner or renamed executable running from a hidden-looking ProgramData directory with mining command-line characteristics. This often indicates cryptojacking activity where an attacker is using system resources for cryptocurrency mining without authorization.
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