Ethan Andrews
@eandrewsTrusted contributorCompletionist
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This rule detects PowerShell commands used to encode data (like hostnames) into hexadecimal strings and exfiltrate it via DNS queries to known Out-of-Band Application Security Testing (OAST) domains. This technique is used by attackers to bypass egress filtering and confirm system compromise, as seen in the exploitation of CVE-2026-1731.
Detects the modification of the 'check_integrity.sh' script to replace 'exit 1' with 'exit 0'. This is a specific defense evasion technique used by the RESURGE malware on Ivanti Connect Secure devices to ensure the compromised system always appears healthy during integrity scans.
Detects a high volume of modifications to the default 'open' command for various file extensions in the registry. This technique is used by malware to prevent users from running applications or opening documents, effectively causing a denial of service.
Detects potential JSON Web Token (JWT) authentication bypass attempts where the algorithm in the token header is explicitly set to "none". A vulnerable server might skip signature validation for such tokens, allowing an attacker to forge arbitrary claims and potentially gain unauthorized access or escalate privileges.
Detects a file with a .mp5 extension in the /tmp directory being made executable via chmod. This technique was used by a stager to deliver the Rekoobe backdoor by masquerading ELF binaries as media files to evade detection.
Detects the creation of a hard link using mklink.exe, where the source is in C:\ProgramData and the destination is an executable in a user's AppData or Temp directory. This technique was observed in an APT36 campaign to stage and execute payloads while evading path-based detections.
Detects the creation of files within hidden folders on removable media that are designed to mimic the Windows Recycle Bin ($RECYCLE.BIN or $RECYCLE.BIN.USER). This technique is used by APT37's THUMBSBD and VIRUSTASK malware to stage malicious files (.rb, .dat) for bridging air-gapped networks.
Detects the execution of a shell command that decodes a base64 string and pipes the output directly into another shell for execution. This is a common obfuscation technique used by malware, including the AMOS stealer dropper delivered via malicious OpenClaw skills, to hide the initial payload.
Detects the use of the legitimate Windows binary 'SystemSettingsAdminFlows.exe' to spawn a child process that disables Windows Defender settings. This is a LOLBin technique used for defense evasion as observed in campaigns leveraging the Apache ActiveMQ exploit.
Detects the presence of malicious Chrome extensions associated with the 10xprofit affiliate hijacking campaign. These extensions are installed as folders with the extension ID as the name in the user's browser profile directory. The rule identifies file events in common browser extension paths for Chrome and Edge, extracts the extension ID, and checks if it matches a known list of malicious IDs.
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