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Arnold Chan

@slaz
Trusted contributorCompletionist
2 followers2,099 downloads4,366 copies51 likes26,035 views

7,555 detections

Detects the creation of scheduled tasks using schtasks.exe or PowerShell that reference specific task names associated with potentially suspicious activity or persistence (e.g., PlutonAgentScheduler, EnterpriseMgmtServicesScheduler). The rule specifically looks for tasks being placed or modified within 'microsoft' or 'pluton' directories or paths, which may indicate an attempt to masquerade as legitimate system services.
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Arnold Chan@slaz
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Midnight Slayer
1 month ago
004
IOC sweep against network telemetry for confirmed BengalSEO/MayaBot campaign infrastructure: the Hostmaza backend IP (5.101.140.80), Matomo tracking domains (stats.us3.org, us3.my), named MayaBot C2 domains (cus.cam, dll.lat, us99.org), and the ~170-domain Traffic Distribution System redirector fleet used to funnel victims to payload delivery. The source intel report contains no file hashes (MD5/SHA1/SHA256) -- only IPs, domains, and URLs -- so this sweep is IP/domain-only. Note the much larger corpus of single-use lure-page domains (~1,000 additional indicators) is excluded as too high-churn for static embedding.
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Arnold Chan@slaz
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Midnight Slayer
1 month ago
004
IOC sweep against network telemetry for confirmed BengalSEO/MayaBot campaign infrastructure: the Hostmaza backend IP (5.101.140.80), Matomo tracking domains (stats.us3.org, us3.my), named MayaBot C2 domains (cus.cam, dll.lat, us99.org), and the ~170-domain Traffic Distribution System redirector fleet used to funnel victims to payload delivery. The source intel report contains no file hashes (MD5/SHA1/SHA256) -- only IPs, domains, and URLs -- so this sweep is IP/domain-only. Note the much larger corpus of single-use lure-page domains (~1,000 additional indicators) is excluded as too high-churn for static embedding.
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Arnold Chan@slaz
Defender - KQL
1 month ago
004
Detects anomalous, high-frequency, multi-channel probing of AI agent input surfaces. The rule identifies external actors sending instruction-injection style keywords across different communication channels (e.g., email, Teams, calendar) within a short window, which may indicate an attempt to identify and manipulate an organization's autonomous agents. Covers T1595.002
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Arnold Chan@slaz
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Midnight Slayer
1 month ago
103
Detects the use of rundll32.exe to execute comsvcs.dll's MiniDump functionality against the LSASS process, a common technique for dumping credentials. The rule includes behavioral correlation by identifying the same user account executing this pattern on multiple devices within a one-hour window.
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Arnold Chan@slaz
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Detections.ai Community
1 month ago
104
Detects potential persistence attempts via registry modifications involving rundll32.exe. The rule monitors for two patterns: registry keys associated with shell commands for specific file types triggering rundll32.exe, and registry 'Run' keys using a 'Locked' value name with a custom URI handler, often indicative of malware or suspicious persistence mechanisms.
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Arnold Chan@slaz
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Detections.ai Community
1 month ago
004
Detects rapid, multi-category system and network enumeration performed by AI-assisted development tools (e.g., Cursor, Claude, ChatGPT). The rule triggers when an AI agent process performs a comprehensive scan of the host environment, specifically covering machine/OS identity, network configuration, process listings, installed software, and access to sensitive credential files within a 10-minute window. It requires at least 5 distinct discovery categories and 6 total events to reduce noise from routine debugging. Covers T1082, T1016, T1057, T1518
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Arnold Chan@slaz
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Hunters
1 month ago
003
This rule performs a sweep across device file and process events to identify the execution or presence of files matching a curated list of 161 SHA256 hashes associated with twelve known malicious threat actors and families (Lynx, ANUBIS, Rhysida, LockBit, ALPHV/BlackCat, Qilin, Medusa, The Gentlemen, NetRunner, Genesis, Pay2Key, and Handala). The rule filters out events occurring in known EDR/AV quarantine or sandbox directory structures and dedupes hits on a per-device and per-hash basis within 24-hour windows to reduce alert noise.
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Arnold Chan@slaz
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Detection & Hunting Community
1 month ago
000
This rule performs a sweep across device file and process events to identify the execution or presence of files matching a curated list of 161 SHA256 hashes associated with twelve known malicious threat actors and families (Lynx, ANUBIS, Rhysida, LockBit, ALPHV/BlackCat, Qilin, Medusa, The Gentlemen, NetRunner, Genesis, Pay2Key, and Handala). The rule filters out events occurring in known EDR/AV quarantine or sandbox directory structures and dedupes hits on a per-device and per-hash basis within 24-hour windows to reduce alert noise.
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Arnold Chan@slaz
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Hunters
1 month ago
000
Detects successful authentication events for accounts that have been dormant for at least 90 days, correlated with suspicious activity markers such as recent failed sign-in attempts, access from an unfamiliar geographic location or ASN, or a complete absence of historical sign-in activity.
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Arnold Chan@slaz
Defender - KQL
1 month ago
211
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