Detections

Explore public detection logic contributed by the community across SIEM and rule languages.

2,294 detections

Detects a sequence where a FortiSIEM-related process writes or modifies a shell script in a cron or phoenix directory, followed closely within 2 minutes by a child process spawned by cron executing that same written script file.
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ills3c Intel&Coffee@Ills3C
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Detections.ai Community
6 days ago
001
Detects when a USB mass storage device is connected to a host and is followed shortly thereafter by a large volume of file creations or modifications on a removable drive, which may indicate data exfiltration or staging.
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ills3c Intel&Coffee@Ills3C
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Detections.ai Community
8 days ago
102
Detects known Indicators of Compromise (IOCs) associated with the Ebury Linux backdoor, including specific file hashes, implants like libkeyutils.so.1.10.2, malicious IP connections, and associated network/email artifacts using Microsoft Defender XDR advanced hunting.
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Arnold Chan@slaz
Defender - KQL
10 days ago
204
Detects potential Linux privilege escalation and persistence activities by monitoring for the creation of persistence scripts in post_boot.d, modifications to the sudoers.template file appending NOPASSWD, or system configuration rebuilds shortly after sudoers template changes.
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Arnold Chan@slaz
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Detections.ai Community
12 days ago
407
Detects potential Linux privilege escalation and persistence activities by monitoring for the creation of persistence scripts in post_boot.d, modifications to the sudoers.template file appending NOPASSWD, or system configuration rebuilds shortly after sudoers template changes.
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Arnold Chan@slaz
Defender - KQL
12 days ago
105
Detects potential Linux privilege escalation and persistence activities by monitoring for the creation of persistence scripts in post_boot.d, modifications to the sudoers.template file appending NOPASSWD, or system configuration rebuilds shortly after sudoers template changes.
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Arnold Chan@slaz
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Hunters
12 days ago
005
Detects the creation or modification of web script files (.aspx, .jsp) within common web application directories by unusual processes (such as command shells or download utilities) or by non-standard user accounts, indicating potential web shell deployment.
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ills3c Intel&Coffee@Ills3C
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Detections.ai Community
6 days ago
000
Detects potential Linux privilege escalation and persistence activities by monitoring for the creation of persistence scripts in post_boot.d, modifications to the sudoers.template file appending NOPASSWD, or system configuration rebuilds shortly after sudoers template changes.
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Arnold Chan@slaz
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Midnight Slayer
12 days ago
003
Detects the creation of cook.pth or cook.py in Python site-packages or dist-packages directories by package managers or interpreters, followed by a Python interpreter execution on the same device within one hour. This pattern matches the malicious supply chain behavior observed in compromised LiteLLM versions (e.g., 1.107.0) utilizing .pth auto-import chains for persistence and execution.
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ills3c Intel&Coffee@Ills3C
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Detections.ai Community
9 days ago
101
Detects modification of core Ivanti Connect Secure system files on the
appliance. Attackers patch shared libraries and Perl modules such as
/home/lib/libdsplibs.so and /home/perl/DSUpgrade.pm to install an implant that is
loaded by legitimate services, blending malicious code into normal appliance
operation and surviving reboots.
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Georg Lauenstein@gsec
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SecOps Signals
13 days ago
203
Detects commands or file-write activity that configures a Tor ExitPolicy matching distinctive policy templates (Policy A or Policy B), indicating potential Tor relay or bridge deployment.
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Arnold Chan@slaz
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Detection & Hunting Community
10 days ago
001
Detects commands or file-write activity that configures a Tor ExitPolicy matching distinctive policy templates (Policy A or Policy B), indicating potential Tor relay or bridge deployment.
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Arnold Chan@slaz
Defender - KQL
10 days ago
001
Detects commands or file-write activity that configures a Tor ExitPolicy matching distinctive policy templates (Policy A or Policy B), indicating potential Tor relay or bridge deployment.
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Arnold Chan@slaz
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Hunters
10 days ago
001
Detects potential Linux privilege escalation and persistence activities by monitoring for the creation of persistence scripts in post_boot.d, modifications to the sudoers.template file appending NOPASSWD, or system configuration rebuilds shortly after sudoers template changes.
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Arnold Chan@slaz
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Detection & Hunting Community
12 days ago
002
Detects Gryxa staging behavior where files are written across 2 or more distinct toolkit directories (such as WinRTCS, WER .wucache, and Diagnosis .etlcache) within a 1-hour window on a single device.
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ills3c Intel&Coffee@Ills3C
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Detections.ai Community
7 days ago
000
Detects modification or creation of .htaccess files within WordPress directory structures followed within 24 hours by the creation or modification of .cache files in the same directory. This behavioral pattern is often indicative of web shell deployment or persistence installation via compromised web applications.
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ills3c Intel&Coffee@Ills3C
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Detections.ai Community
9 days ago
000
Detects the creation of persistence artifacts associated with the 'gh-token-monitor' service utilized by the Shai-Hulud worm across Linux systemd user services, macOS LaunchAgents, and Windows scheduled tasks or local application directories. This service acts as a dead-man's switch designed to wipe the user's home directory if the stolen GitHub token is revoked.
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Tim Peck@timpeck
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Detections.ai Community
19 days ago
108
Detects creation or modification of cron entries on the BeyondTrust
Remote Support / Privileged Remote Access appliance. After exploiting the pre-auth
vulnerability, attackers establish recurring execution for persistence and C2
beaconing via cron (T1053.003) on the Linux-based appliance.
Follows CISA's urgent patch advisory for BeyondTrust appliances.
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Georg Lauenstein@gsec
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SecOps Signals
14 days ago
002
Detects modification of a monitored file on a Centrify-managed Linux host. File
integrity events on Unix servers catch tampering with configuration, authorised keys
and service definitions — the common Linux persistence routes, which leave no
registry trace and no Windows-style artefact.

Onboarding: CENTRIFY-AUDITTRAIL-LINUX is ingested via Syslog (KV) (Bloo extractor 822).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector

BQL (Bloo Query Language):

stream=iam where sourcename='CENTRIFY-AUDITTRAIL-LINUX' and action='FILE_MODIFIED'
| groupby user, targetuser, domain
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Siddhant Mishra@Siddhant
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Bloo SpecterForce
10 days ago
000
Detects known Indicators of Compromise (IOCs) associated with the Ebury Linux backdoor, including specific file hashes, implants like libkeyutils.so.1.10.2, malicious IP connections, and associated network/email artifacts using Microsoft Defender XDR advanced hunting.
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Arnold Chan@slaz
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Midnight Slayer
10 days ago
000
Detects known Indicators of Compromise (IOCs) associated with the Ebury Linux backdoor, including specific file hashes, implants like libkeyutils.so.1.10.2, malicious IP connections, and associated network/email artifacts using Microsoft Defender XDR advanced hunting.
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Arnold Chan@slaz
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Detection & Hunting Community
10 days ago
000
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