Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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IDS Classtypes
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This rule detects potential attempts to tamper with or bypass Windows Defender by monitoring for files or processes named 'ShieldCrash' occurring in close temporal proximity to the creation or modification of files within Windows Defender's shadow or scan directories (BaseNamedObjects\Restricted\WD_SHADOW_ or WD_SCAN). This behavior is often associated with malware attempting to evade security detection.
This rule detects potential attempts to tamper with or bypass Windows Defender by monitoring for files or processes named 'ShieldCrash' occurring in close temporal proximity to the creation or modification of files within Windows Defender's shadow or scan directories (BaseNamedObjects\Restricted\WD_SHADOW_ or WD_SCAN). This behavior is often associated with malware attempting to evade security detection.
Detects potential process injection attempts involving 'charmap.exe', a Windows system utility. The rule monitors for a sequence of memory management and thread creation API calls (OpenProcess, VirtualAlloc, WriteProcessMemory, and CreateRemoteThread) originating from or targeting this binary, which is often abused as a host for malicious code to bypass security controls.
Detects instances where a browser process (chrome.exe) accesses the microphone or camera within a 2-minute temporal window of communicating with 'gemini.google.com'. This rule is intended to identify potential unauthorized use of system peripherals in the context of an AI-agent session.
Detects rapid AI agent state transitions (from 'think' to 'act') within Microsoft Edge processes, specifically identifying potential exploitation of the CVE-2026-55945 race condition vulnerability, which could be used to force the unauthorized execution of an injected prompt.
Detects DLL injection into browser processes (chrome.exe or msedge.exe) followed by the invocation of the browser's Elevation Service 'DecryptData' function, a behavior characteristic of the Rapuncel credential stealer attempting to bypass app-bound encryption.
Identifies instances of Google Chrome running on endpoints with version numbers below the threshold patched for CVE-2026-85046. This detection focuses on specific build numbers (e.g., 152.0.7977.82 for Windows/Linux) to identify potentially vulnerable browser installations in the environment.
Detects the GoCaracal lightweight implant performing process injection by identifying combinations of remote process memory allocation (VirtualAllocRemoteApiCall), memory writing (WriteProcessMemoryRemoteApiCall), and remote thread creation (CreateRemoteThreadApiCall) associated with specific suspicious filenames. It also monitors command-line activity for injection-related flags.
Detects the use of common Linux command-line utilities (sed, grep, awk, bash, sh) to perform operations on sensitive system logs or shell history files. The rule targets command strings indicative of log modification, filtering, or removal of audit trails, often associated with an attacker attempting to conceal malicious activity.
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 the creation of specific mutex objects ('AppUpdateHelper' or 'WinSvc') commonly associated with Hidden VNC (hVNC) backdoors. These mutexes are used by the malware to ensure only one instance is running on the host, and the regex pattern targets the specific naming convention (including a hex suffix) utilized by these threats.
Detects instances where cvtres.exe performs suspicious actions such as ProcessInjected, CreateRemoteThread, or OpenProcessApiCall, excluding known legitimate development and build tool contexts. This activity is highly anomalous as cvtres.exe is a resource object converter and should not be interacting with the memory of other processes.
This rule detects the process 'ShieldCrash.exe' accessing or interacting with the Windows ELAM (Early Launch Anti-Malware) configuration directory. ELAM drivers are critical components for secure boot and early malware detection; unauthorized access or manipulation by unknown processes may indicate an attempt to tamper with security tools or evade endpoint protection.
This rule detects the process 'ShieldCrash.exe' accessing or interacting with the Windows ELAM (Early Launch Anti-Malware) configuration directory. ELAM drivers are critical components for secure boot and early malware detection; unauthorized access or manipulation by unknown processes may indicate an attempt to tamper with security tools or evade endpoint protection.
BigBear 2.0 IOC HUNT (Cortex XDR)
Cortex XDR
CloudSEK researchers uncovered BigBear 2.0, a global Microsoft 365 phishing-as-a-service operation targeting hundreds of organizations across 40+ countries. The investigation exposed the attacker’s admin panel, affiliate network, phishing infrastructure, and thousands of stolen credentials and session cookies, revealing how modern AiTM attacks can hijack authenticated sessions even after MFA.
BigBear 2.0 IOC HUNT (Cortex XDR)
Cortex XDR
CloudSEK researchers uncovered BigBear 2.0, a global Microsoft 365 phishing-as-a-service operation targeting hundreds of organizations across 40+ countries. The investigation exposed the attacker’s admin panel, affiliate network, phishing infrastructure, and thousands of stolen credentials and session cookies, revealing how modern AiTM attacks can hijack authenticated sessions even after MFA.
Detects outbound network connections to 'registry.npmjs.org' originating from 'node' or 'bun' processes. This behavior may indicate an attempt to exfiltrate data, interact with malicious packages, or perform credential harvesting via npm tokens during execution.
Detects the presence of known file hashes associated with Vectra Remote Access Trojan (RAT). The rule monitors both file creation/existence events and process execution events where the SHA256 hash matches the identified indicators of compromise.
Detects the presence of known file hashes associated with Vectra Remote Access Trojan (RAT). The rule monitors both file creation/existence events and process execution events where the SHA256 hash matches the identified indicators of compromise.
Detects instances where processes associated with AutoIt scripting (e.g., AutoIt-based compiled executables or scripts) initiate suspicious API calls including CreateRemoteThread, OpenProcess, or generic ProcessInjection against known target binaries such as RegSvcs.exe or mobsync.exe. These binaries are frequently abused for proxy execution or living-off-the-land techniques to hide malicious activity.
This rule detects potential attempts to tamper with or bypass Windows Defender by monitoring for files or processes named 'ShieldCrash' occurring in close temporal proximity to the creation or modification of files within Windows Defender's shadow or scan directories (BaseNamedObjects\Restricted\WD_SHADOW_ or WD_SCAN). This behavior is often associated with malware attempting to evade security detection.
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