Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects modification of user account attributes in Active Directory. Attribute
changes are how durable access is engineered quietly: disabling pre-authentication,
setting a service principal name, or clearing password expiry each weaken an account
without creating a new one for anybody to notice.
Onboarding: MANAGE-ENGINE-ADAUDIT-PLUS is ingested via Syslog (KV) (Bloo extractor 830).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=iam where sourcename='MANAGE-ENGINE-ADAUDIT-PLUS'
and action='USER_ACCOUNT_CHANGED'
| groupby user, targetuser, accountdomain, category, role
changes are how durable access is engineered quietly: disabling pre-authentication,
setting a service principal name, or clearing password expiry each weaken an account
without creating a new one for anybody to notice.
Onboarding: MANAGE-ENGINE-ADAUDIT-PLUS is ingested via Syslog (KV) (Bloo extractor 830).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=iam where sourcename='MANAGE-ENGINE-ADAUDIT-PLUS'
and action='USER_ACCOUNT_CHANGED'
| groupby user, targetuser, accountdomain, category, role
Detects access to directory service objects. Bulk reads of directory objects are how
an attacker maps the domain — users, groups, trusts, service principals — before
deciding what to target. It is read-only activity, which means nothing breaks and
nothing else is likely to alert.
Onboarding: MANAGE-ENGINE-ADAUDIT-PLUS is ingested via Syslog (KV) (Bloo extractor 830).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=win-audit where sourcename='MANAGE-ENGINE-ADAUDIT-PLUS'
and action='DIRECTORY_SERVICE_ACCESSED'
| duration 1h
| groupby user, objectclass, objecttype, domain
an attacker maps the domain — users, groups, trusts, service principals — before
deciding what to target. It is read-only activity, which means nothing breaks and
nothing else is likely to alert.
Onboarding: MANAGE-ENGINE-ADAUDIT-PLUS is ingested via Syslog (KV) (Bloo extractor 830).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=win-audit where sourcename='MANAGE-ENGINE-ADAUDIT-PLUS'
and action='DIRECTORY_SERVICE_ACCESSED'
| duration 1h
| groupby user, objectclass, objecttype, domain
Detects an unusual volume of externally directed mail from one sender. Mail is a
high-capacity exfiltration channel that is permitted by default, and a compromised
mailbox sending outward in bulk is both data loss and, where the content is phishing,
damage to the organisation's sending reputation.
Onboarding: MS-EXCHANGE is ingested via Syslog (Bloo extractor 142).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=email-gateway where sourcename='MS-EXCHANGE'
and action='EMAIL_SENT_EXTERNAL'
| duration 1h
| groupby sender
| select sender, count(*) as cnt
| having cnt > 100
high-capacity exfiltration channel that is permitted by default, and a compromised
mailbox sending outward in bulk is both data loss and, where the content is phishing,
damage to the organisation's sending reputation.
Onboarding: MS-EXCHANGE is ingested via Syslog (Bloo extractor 142).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=email-gateway where sourcename='MS-EXCHANGE'
and action='EMAIL_SENT_EXTERNAL'
| duration 1h
| groupby sender
| select sender, count(*) as cnt
| having cnt > 100
Detects a pattern of lease denials consistent with DHCP starvation, where an attacker
requests leases until the pool is empty so that legitimate devices cannot obtain an
address. It is typically a precursor to a rogue DHCP server taking over address
assignment and redirecting traffic.
Onboarding: WIN-DHCP is ingested via Syslog (Bloo extractor 79).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=dhcp where sourcename='WIN-DHCP' and action='IP_LEASE_DENIED'
| duration 10m
| groupby macaddress
| select macaddress, count(*) as cnt
| having cnt > 20
requests leases until the pool is empty so that legitimate devices cannot obtain an
address. It is typically a precursor to a rogue DHCP server taking over address
assignment and redirecting traffic.
Onboarding: WIN-DHCP is ingested via Syslog (Bloo extractor 79).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=dhcp where sourcename='WIN-DHCP' and action='IP_LEASE_DENIED'
| duration 10m
| groupby macaddress
| select macaddress, count(*) as cnt
| having cnt > 20
Detects a DHCP lease request from a MAC address absent from the asset inventory. DHCP
sees every device that joins the network, including those with no agent, no domain
membership and no EDR — which makes it the only reliable place to catch unmanaged
hardware appearing on the wire.
Requires an inventory of known MAC addresses to compare against; without one this
detection has nothing to anchor to.
Onboarding: WIN-DHCP is ingested via Syslog (Bloo extractor 79).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=dhcp where sourcename='WIN-DHCP' and action='IP_LEASED'
| groupby macaddress, srcip, user
sees every device that joins the network, including those with no agent, no domain
membership and no EDR — which makes it the only reliable place to catch unmanaged
hardware appearing on the wire.
Requires an inventory of known MAC addresses to compare against; without one this
detection has nothing to anchor to.
Onboarding: WIN-DHCP is ingested via Syslog (Bloo extractor 79).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=dhcp where sourcename='WIN-DHCP' and action='IP_LEASED'
| groupby macaddress, srcip, user
Detects one MAC address obtaining an unusual number of distinct leases. Legitimate
devices hold a lease and renew it. Rapid cycling suggests either MAC spoofing or a
device deliberately churning addresses to frustrate tracking and evade controls bound
to an IP.
Onboarding: WIN-DHCP is ingested via Syslog (Bloo extractor 79).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=dhcp where sourcename='WIN-DHCP' and action='IP_LEASED'
| duration 1h
| groupby macaddress
| select macaddress, distinct_count(srcip)
| having distinct_count_col1 > 5
devices hold a lease and renew it. Rapid cycling suggests either MAC spoofing or a
device deliberately churning addresses to frustrate tracking and evade controls bound
to an IP.
Onboarding: WIN-DHCP is ingested via Syslog (Bloo extractor 79).
Integration guide: https://bloo.io/docs/hypercloud/syslog-connector
BQL (Bloo Query Language):
stream=dhcp where sourcename='WIN-DHCP' and action='IP_LEASED'
| duration 1h
| groupby macaddress
| select macaddress, distinct_count(srcip)
| having distinct_count_col1 > 5
Detects HTTP requests to a Cloudflare Workers subdomain
(*.workers.dev) targeting the /token/v1/{UID} signaling endpoint, originating
from a headless Chrome user agent. Chaos ransomware's msaRAT offloads all C2
signaling to the browser via CDP-injected JavaScript, performing WebRTC SDP
Offer/Answer exchange through this trusted developer platform to evade domain
reputation blocking.
(*.workers.dev) targeting the /token/v1/{UID} signaling endpoint, originating
from a headless Chrome user agent. Chaos ransomware's msaRAT offloads all C2
signaling to the browser via CDP-injected JavaScript, performing WebRTC SDP
Offer/Answer exchange through this trusted developer platform to evade domain
reputation blocking.
Detects curl.exe writing an MSI package into the ProgramData
directory. Chaos ransomware stages a trojanized installer this way, fetching
update_ms.msi from an attacker-controlled host over plain HTTP on port 443 so
the traffic reads as TLS to port-based inspection. The match is on the
behaviour rather than on that filename: curl is a signed in-box binary and has
no legitimate reason to drop an installer package into ProgramData.
directory. Chaos ransomware stages a trojanized installer this way, fetching
update_ms.msi from an attacker-controlled host over plain HTTP on port 443 so
the traffic reads as TLS to port-based inspection. The match is on the
behaviour rather than on that filename: curl is a signed in-box binary and has
no legitimate reason to drop an installer package into ProgramData.
This rule detects indicator of compromise (IOC) sweep events associated with the AhsayCBS campaign (CVE-2026-105133 and CVE-2026-105134) involving XMRig cryptominer activity. It checks for specific file and process SHA256 hashes, remote IP addresses, and domain connections related to known mining pools or attacker infrastructure using Sentinel Device tables.
Detects repeated Ollama application error events as a possible availability issue. Ollama application logs do not reliably record process termination, so this search cannot confirm a service crash without operating system or service manager telemetry.
Point-in-time sweep of the 16 published BraZetsu sample SHA-256 hashes across file, process and image-load telemetry. Hashes rotated across five versions, so absence of a hit does not rule out BraZetsu.
Detects potential web shell activity where a web or application server process (such as IIS, Apache, Nginx, or Tomcat) writes a script file (e.g., .aspx, .jsp, .php) into a web-accessible directory, followed shortly by spawning a command-line shell or utility process.
Detects the execution of reverse engineering and decompilation tools such as JADX or Blutter against Android APK files or Flutter application binaries (libapp.so), as well as the creation of their typical output artifacts and staging folders.
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.
Detects potential defense evasion activity where Windows Defender configurations are modified or disabled, followed closely within 20 minutes by a silent, quiet, or unattended software uninstallation initiated by a script interpreter or command processor on the same device.
IOC sweep (SHA256, domains, URLs, IPs, sender emails) for the RedFlick-style VHDX/LNK/WebDAV campaign against Moldovan and Ukrainian civil society, with false-positive controls.
Sweeps file, process and image-load telemetry for known Kimsuky (APT-C-55) malware MD5 hashes. Exact hash matches carry very low false-positive risk.
Detects network connections, process executions, file creations, and image loads associated with the UNC7017 AOMEI supply chain campaign IOC sweep, including specific malicious URLs, domains, IPs, file paths, and hashes.
Detects the Blackwood tunneling tool from Blinder Tunnel. Blackwood.dll is sideloaded into a signed vshost32.exe via its .config and reflectively loads Go-compiled Chisel, which dials a raw public IP and opens a reverse SOCKS proxy for lateral pivoting.
Detects modification of the Microsoft Security Center AV registry keys, particularly those related with DisplayName, ProductEXE, or ReportingExe.
These keys typically store information about antivirus products installed on the system, which is Windows Defender or third-party antivirus software.
But, if these keys holds unexpected values or are modified in a suspicious manner, it could indicate an attempt to tamper with the security settings of the system.
These keys typically store information about antivirus products installed on the system, which is Windows Defender or third-party antivirus software.
But, if these keys holds unexpected values or are modified in a suspicious manner, it could indicate an attempt to tamper with the security settings of the system.
Detects the sequential relationship of data staging using tools like WinRAR and subsequent exfiltration using tools like Rclone, WinSCP, or FileZilla on a single host within a 24-hour window.
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