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T1566.001Spearphishing Attachment

T1566.001 — Spearphishing Attachment is a MITRE ATT&CK technique in the Initial Access tactic. Clankerusecase tracks 61 detection use cases covering it and 136 threat-intel articles citing it.

Initial Access
View on the matrix → Filter Detection Library MITRE official spec ↗
61Use cases
136Articles
0Sub-techniques
1Tactic
↑ Parent technique: T1566 · Phishing

Use cases covering this technique (61)

Abnormal Security: malicious email opened Internal delivery · alerting DD Email attachment opened from external sender Internal delivery · hunting DSP Email Attachments With Lots Of Spaces ESCU actions · hunting P Suspicious Email Attachment Extensions ESCU actions · hunting P GSuite Email Suspicious Attachment ESCU actions · hunting P Gsuite Email Suspicious Subject With Attachment ESCU actions · hunting P Gsuite Email With Known Abuse Web Service Link ESCU actions · hunting P Gsuite Suspicious Shared File Name ESCU actions · hunting P O365 Email Reported By Admin Found Malicious ESCU actions · alerting P O365 Email Reported By User Found Malicious ESCU actions · alerting P O365 Safe Links Detection ESCU actions · alerting P O365 Threat Intelligence Suspicious Email Delivered ESCU actions · hunting P O365 ZAP Activity Detection ESCU actions · hunting P Detect Outlook exe writing a zip file ESCU actions · hunting P Windows CAB File on Disk ESCU actions · hunting P Windows Defender ASR Audit Events ESCU actions · hunting P Windows Defender ASR Block Events ESCU actions · hunting P Windows Defender ASR Rules Stacking ESCU actions · hunting P Windows ISO LNK File Creation ESCU actions · hunting P Windows Office Product Dropped Cab or Inf File ESCU actions · alerting P Windows Office Product Dropped Uncommon File ESCU actions · hunting P Windows Office Product Loaded MSHTML Module ESCU actions · hunting P Windows Office Product Loading Taskschd DLL ESCU actions · hunting P Windows Office Product Loading VBE7 DLL ESCU actions · hunting P Windows Office Product Spawned Child Process For Download ESCU actions · alerting P Windows Office Product Spawned Control ESCU actions · alerting P Windows Office Product Spawned MSDT ESCU actions · alerting P Windows Office Product Spawned Rundll32 With No DLL ESCU actions · alerting P Windows Office Product Spawned Uncommon Process ESCU actions · alerting P Windows Phishing PDF File Executes URL Link ESCU actions · hunting P Windows Phishing Recent ISO Exec Registry ESCU actions · hunting P Windows Spearphishing Attachment Onenote Spawn Mshta ESCU actions · alerting P Windows Universal Data Link File Creation ESCU actions · hunting P Windows Spearphishing Attachment Connect To None MS Office Domain ESCU actions · hunting P MSHTML Module Load in Office Product ESCU actions · alerting P Office Application Drop Executable ESCU actions · alerting P Office Application Spawn Regsvr32 process ESCU actions · alerting P Office Application Spawn rundll32 process ESCU actions · alerting P Office Document Creating Schedule Task ESCU actions · alerting P Office Document Executing Macro Code ESCU actions · alerting P Office Document Spawned Child Process To Download ESCU actions · alerting P Office Product Spawn CMD Process ESCU actions · alerting P Office Product Spawning BITSAdmin ESCU actions · alerting P Office Product Spawning CertUtil ESCU actions · alerting P Office Product Spawning MSHTA ESCU actions · alerting P Office Product Spawning Rundll32 with no DLL ESCU actions · alerting P Office Product Spawning Windows Script Host ESCU actions · alerting P Office Product Spawning Wmic ESCU actions · alerting P Office Product Writing cab or inf ESCU actions · alerting P Office Spawning Control ESCU actions · alerting P Windows Office Product Spawning MSDT ESCU actions · alerting P Winword Spawning Cmd ESCU actions · alerting P Winword Spawning PowerShell ESCU actions · alerting P Winword Spawning Windows Script Host ESCU actions · alerting P [LLM] Inbound email from F6 fraud clone domain (ruspromexport-group.ru / info@ruspromexport-group.ru) Bespoke delivery · alerting DS [LLM] Inbound phishing from BEC sender domain 9i6pokerdepot.com (Q2 2026 ClickUp/pixeldrain chain) Bespoke delivery · alerting DSP [LLM] Inbound HTML-attachment lure exploiting Zimbra XSS (CVE-2025-66376) Bespoke delivery · hunting DS [LLM] Law-firm / order-confirmation lure delivering device-code phish via cacoo.com and allianceinvestigators.com Bespoke delivery · hunting DS [LLM] Mailcow quarantine XSS via EICAR + HTML in attachment filename (GHSA-2xjc-rg88-jvpp) Bespoke delivery · alerting DSΣPDD [LLM] Silver Fox Japan tax-season lure: inbound email with Japanese HR/ESOP subject + gofile.io URL or RAR/ZIP Bespoke delivery · alerting DS [LLM] Inbound email with HTML attachment linking to unpkg.com Beamglea package Bespoke delivery · alerting DSP

Articles citing this technique (136)

crit Amazon Links Debug and Chalk npm Hijack to North Korea’s Sapphire Sleet art-00
crit Cisco FMC Zero-Day Actively Exploited, Static Credentials Could Expose Sensitive Data art-01
crit Critical Rails Flaw Could Let Unauthenticated Attackers Read Server Files via Image Uploads art-06
high Health-ISAC warns of rising ShinyHunters data theft attacks on healthcare art-07
crit Ruflo MCP Flaw Lets Unauthenticated Attackers Run Commands and Poison AI Memory art-12
crit Three Critical VMware Flaws Allow Auth Bypass, Code Execution, and VM Escape art-13
crit Coordinated Cyberattack Targets 30+ Minnesota Water Systems as One Plant Goes Offline art-18
high Nine-Year Fraud Campaign Clones Russian Company Sites to Steal Advance Payments art-19
crit Researchers Show a Single Malicious Webpage Visit Can Compromise Tor Browser art-22
crit Public PoC Released for Exploited Check Point SmartConsole Authentication Bypass art-26
crit OpenAI Agent Used Exposed Credentials Across Four Services During Hugging Face Breach art-27
crit New Gitea RCE Lets Repository Writers Plant a Git Hook to Run Shell Commands art-28
crit Flying Eagle Android RAT Traces Found on 170 Servers as Source Code Circulates art-29
high CubePilot drone software dev hit by DNS hijacking to intercept traffic art-37
high Tengu Botnet Reboots Compromised Linux Devices When Defenders Kill Its Process art-43
crit 24,650 Internet-Exposed BMCs Disclose IPMI Password Hashes Before Login art-44
crit JFrog Confirms OpenAI Models Exploited Artifactory Zero-Day Before Hugging Face Breach art-47
crit Critical OpenWrt DHCPv6 Flaw Could Let Unauthenticated Attackers Run Code as Root art-48
crit Nimbus Manticore Deploys NightLedger and Turns Victim Systems Into Covert Relays art-49
crit IR Trends Q2 2026: Phishing and weaponized remote management tools drive attack chains art-50
crit Critical TeamCity Flaw Could Let Attackers Run OS Commands Without Logging In art-51
crit Researcher Says AI Helped Develop Linux Traffic-Control Race Into Root Exploit art-52
crit Mirage Kitten targets Middle East and Africa region with new malware art-53
crit Attackers Exploit Arista VeloCloud Orchestrator Command Injection Flaw art-55
high NVIDIA Forms 37-Member Open Secure AI Alliance and Open-Sources NOOA Framework art-57
crit Dysphoria IoT Botnet Adds Blockchain C2 and Victim Relays After JackSkid Disruption art-58
crit Public Exploit Released for Patched vBulletin Pre-Auth Code Execution Flaw art-61
crit n8n Sandbox Escape Lets Workflow Editors Run OS Commands as the n8n Process art-63
high Operation BlueDash Deploys Level RMM and ScreenConnect via Fake Teams Update art-64
crit Cruciferra Crypter Uses BYOVD and Process Ghosting to Hide Windows Malware art-65
crit TELESHIM Abuses Telegram for C2 in Attacks Against Middle East Governments art-66
high GitHub Adds 3-Day Dependabot Cooldown to Limit Poisoned Package Adoption art-67
high Malvertising Sends Malware in Pieces, Then Makes the Browser Build the Executable art-71
crit Fastjson 1.x RCE Vulnerability Targeted in Attacks With No Patched Available art-72
high Researcher Publishes GitLab RCE PoC Letting Authenticated Users Run Commands as Git art-73
crit CTM360 Research Reveals How Insurance Phishing Has Evolved Into Real-Time Account Hijacking art-74
crit Cl0p Affiliates Target Internet-Exposed PTC Windchill and FlexPLM with Unauthenticated RCE art-75
crit DevMan RaaS Portal Centralizes Payload Builds, Victim Management, and Affiliate Payouts art-76
crit BlueNoroff Zoom Phishing Kit Profiles Crypto Wallets Before Malware Delivery art-96
crit Certighost Exploit Lets Low-Privileged Active Directory Users Impersonate a Domain Controller art-97
high ChatGPT AgentForger Flaw Could Deploy Rogue Workspace Agents via a Phishing Link art-99
crit Hacker Runs Hermes AI Agent Unattended for Post-Exploitation at Thai Finance Ministry art-102
crit Golden Chickens Resurfaces With Four New Malware Families and Modular Implants art-103
crit NodeBB Patches Eight AI-Found Flaws Exposing Admin Access and Private Chats art-104
crit Kimi K3 Agents Found Redis Zero-Days and Built RCE Exploit, Researchers Say art-105
crit Email threat landscape: Q2 2026 trends and insights art-108
crit Russian Global Webmail Espionage art-111
high Iran War Cyber Threat Landscape | A Midyear Assessment on What Matters art-131
high ACR Stealer: Two observed intrusion chains amid increased threat activity art-146
crit AI, Automation and Attacks: Unpacking the Unit 42 2026 Global Incident Response Report art-147
crit Begun, the Patch Wars have art-150
high Unpacking the AsyncAPI npm supply chain compromise and import-time payload delivery art-157
crit [GHSA / CRITICAL] CVE-2026-52881: MantisBT: Reflected XSS in admin/install.php via unescaped printf art-165
high Turning threat intelligence into decisive action with Defender Experts art-167
crit OkoBot: new sophisticated malware framework targets cryptocurrency users art-169
high The serpent’s tongue: Luring the Python out of its den art-180
crit No Manners Here: The Ruthless Rise of The Gentlemen Ransomware art-198
crit Winning 54% of the time art-214
crit ESET Threat Report H1 2026 art-221
high Threat landscape for industrial automation systems. Q1 2026 art-228
crit When checking the URL isn’t enough: a Device Code Phishing attack via a Microsoft website art-246
high Cyber readiness for SMBs: Getting the basics right art-249
crit Armored Likho digging a snake pit: inside the covert BusySnake Stealer campaign art-250
high How We Added WebAuthn to a Browser-Based RDP Client art-251
high Catan and Mouse art-261
crit Phantom Squatting: AI-Hallucinated Domains as a Software Supply Chain Vector art-280
high Inside the inbox: Why cybercriminals want to break into your email account art-285
high Threat Brief: Mitigating Large-Scale Credential Attacks art-289
high Gamaredon in 2025: Leveraging tunnels, workers, dead drops, and new alliances art-294
high The Global Namespace Risk: Universal Bucket Hijacking Technique for Cloud Data Exfiltration art-312
crit Pickle in the Middle – Hijacking Vertex AI Model Uploads for Cross-Tenant RCE art-327
high EvilTokens: A phishing attack that doesn’t steal your password art-331
high npm v12 delivers one of the biggest security improvements in years art-339
high What MDM can't protect on developer machines (and what to do about it) art-386
crit ESET APT Activity Report Q4 2025–Q1 2026 art-387
crit BTMOB: A stealthy RAT burrowing deep into Android devices art-397
med Foul play: Fake FIFA websites target soccer fans looking for World Cup tickets, merchandise art-402
crit The Wild West of VS Code extensions and how a poisoned extension breached GitHub art-411
crit FrostyNeighbor: Fresh mischief and digital shenanigans art-435
crit PCPJack | Cloud Worm Evicts TeamPCP and Steals Credentials at Scale art-446
high Someone published four versions of a fake "tanstack" package in 27 minutes to steal your .env files art-469
high It's time to treat browser extensions like supply chain attack vectors art-477
crit New NGate variant hides in a trojanized NFC payment app art-491
high Multiple Cross-Site Scripting (XSS) Vulnerabilities in Mailcow art-501
high As breakout time accelerates, prevention-first cybersecurity takes center stage art-530
high Axios npm Package Compromised: Supply Chain Attack Delivers Cross-Platform RAT art-542
high A cunning predator: How Silver Fox preys on Japanese firms this tax season art-548
crit EDR killers explained: Beyond the drivers art-577
crit GlassWorm Hides a RAT Inside a Malicious Chrome Extension art-580
crit Cyber fallout from the Iran war: What to have on your radar art-593
crit Sednit reloaded: Back in the trenches art-596
crit Protecting education: How MDR can tip the balance in favor of schools art-607
crit PlugX Meeting Invitation via MSBuild and GDATA art-615
high 20+ Popular NPM Packages Compromised (Chalk, Debug, Strip-ANSI, Color-Convert, Wrap-ANSI...) art-640
crit Naming and shaming: How ransomware groups tighten the screws on victims art-645
crit Another npm Supply Chain Attack: The 'is' Package Compromise art-654
crit ESET Threat Report H2 2025 art-732
med Why Threat Modeling Is Now Even More Critical for AI-Native Applications art-772
crit ESET APT Activity Report Q2 2025–Q3 2025 art-793
crit Phishing Campaign Leveraging the NPM Ecosystem art-823
high Zero-day Extensive NPM Package Compromise - Shai Hulud Supply Chain Attack art-852
high npm Supply Chain Attack via Open Source maintainer compromise art-855
high Weaponizing AI Coding Agents for Malware in the Nx Malicious Package Security Incident art-865
high Snyk Joins CISA's Secure by Design Pledge art-883
crit Maintainers of ESLint Prettier Plugin Attacked via npm Supply Chain Malware art-894
crit CISA KEV: CVE-2024-38226 — Microsoft Publisher Protection Mechanism Failure Vulnerability art-1230
crit Polyfill supply chain attack embeds malware in JavaScript CDN assets art-1296
crit Snyk Learn and the NIST Cybersecurity Framework (CSF) art-1382
high Defense in Depth art-1391
crit New Year's security resolutions for 2024 from Snyk DevRel, SecRel, and friends art-1421
high Cybersecurity Venture’s 2023 Software Supply Chain Attack Report art-1538
high XS leaks: What they are and how to avoid them art-1640
high Ethical hacking techniques art-1698
high Ethical Hacking: Top Tools art-1702
crit API Security Guide art-1751
high Securing the web (forward) art-1803
crit The rising trend of malicious packages in open source ecosystems art-1804
high Cybersecurity Hygiene 101 art-1824
crit Key points from Google and Accenture's ransomware white paper art-1935
crit Secure Python URL validation art-1937
crit Understanding DNS attacks: Identifying and patching vulnerabilities art-1949
high Avoiding SMTP Injection: A Whitebox primer art-2006
high Securing PHP containers art-2082
crit Alert: LaughTilYouCry ransomware sabotages npm package (with puns) art-2342
high How Snyk helps satisfy White House cybersecurity recommendations art-2454
med Getting started at a new organization art-2663
crit The Secure Developer: 2021 in review art-2691
high How Dun & Bradstreet and Shutterstock built successful security champions programs art-3068
high Docker Hub authentication: Is 2021 the year you enable 2FA on Docker Hub? art-3196
crit What is typosquatting and how typosquatting attacks are responsible for malicious modules in npm art-3226
high Cheatsheet: top 10 application security acronyms art-3247
crit Demystifying HTTP request smuggling art-3335
high ReDoS vulnerabilities in npm spikes by 143% and XSS continues to grow art-3557
med Python 2 vs 3: Security Differences art-3632
crit XSS Attacks: The Next Wave art-3641
high Which of the OWASP Top 10 Caused the World’s Biggest Data Breaches? art-3644