Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects when a Microsoft Cloud App Security reported users were active from an IP address identified as risky by Microsoft Threat Intelligence.
These IP addresses are involved in malicious activities, such as Botnet C&C, and may indicate compromised account.
These IP addresses are involved in malicious activities, such as Botnet C&C, and may indicate compromised account.
Detects when a Microsoft Cloud App Security reported when an activity occurs from a location that wasn't recently or never visited by any user in the organization.
Detects the use of wget to download content in a temporary directory such as "/tmp" or "/var/tmp"
Curl Usage on Linux
Sigma
Detects a curl process start on linux, which indicates a file download from a remote location or a simple web request to a remote server
Detects the use of wget to download content to a suspicious directory
Detects the execution of suspicious child processes from macOS installer package parent process. This includes osascript, JXA, curl and wget amongst other interpreters
Detects potential in-memory downloading and compiling of applets using curl and osacompile as seen used by XCSSET malware
Detects the execution traces of the WizardUpdate malware. WizardUpdate is a macOS trojan that attempts to infiltrate macOS machines to steal data and it is associated with other types of malicious payloads, increasing the chances of multiple infections on a device.
Detects suspicious DNS queries known from Cobalt Strike beacons
Detects suspicious DNS queries to api.telegram.org used by Telegram Bots of any kind
Detects wannacry killswitch domain dns queries
The DNS Z flag is bit within the DNS protocol header that is, per the IETF design, meant to be used reserved (unused).
Although recently it has been used in DNSSec, the value being set to anything other than 0 should be rare.
Otherwise if it is set to non 0 and DNSSec is being used, then excluding the legitimate domains is low effort and high reward.
Determine if multiple of these files were accessed in a short period of time to further enhance the possibility of seeing if this was a one off or the possibility of larger sensitive file gathering.
This Sigma query is designed to accompany the Corelight Threat Hunting Guide, which can be found here: https://www3.corelight.com/corelights-introductory-guide-to-threat-hunting-with-zeek-bro-logs'
Although recently it has been used in DNSSec, the value being set to anything other than 0 should be rare.
Otherwise if it is set to non 0 and DNSSec is being used, then excluding the legitimate domains is low effort and high reward.
Determine if multiple of these files were accessed in a short period of time to further enhance the possibility of seeing if this was a one off or the possibility of larger sensitive file gathering.
This Sigma query is designed to accompany the Corelight Threat Hunting Guide, which can be found here: https://www3.corelight.com/corelights-introductory-guide-to-threat-hunting-with-zeek-bro-logs'
Detects suspicious malformed user agent strings in proxy logs
Detects User Agent strings that end with an equal sign, which can be a sign of base64 encoding.
Detects the creation of an "Active Directory Schema Cache File" (.sch) file by an uncommon tool.
Detects SILENTTRINITY stager dll loading activity
Detects a network connection initiated by the certutil.exe utility.
Attackers can abuse the utility in order to download malware or additional payloads.
Attackers can abuse the utility in order to download malware or additional payloads.
Detects a non-browser process communicating with the Notion API. This could indicate potential use of a covert C2 channel such as "OffensiveNotion C2"
Detects svchost hosting RDP termsvcs communicating with the loopback address and on TCP port 3389
Detects svchost hosting RDP termsvcs communicating to target systems on TCP port 80 or 443
Detects programs that connect to uncommon destination ports
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