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T1566.001Spearphishing Attachment

T1566.001 — Spearphishing Attachment is a MITRE ATT&CK technique in the Initial Access tactic. Clankerusecase tracks 60 detection use cases covering it and 101 threat-intel articles citing it.

Initial Access
View on the matrix → Filter Detection Library MITRE official spec ↗
60Use cases
101Articles
0Sub-techniques
1Tactic
↑ Parent technique: T1566 · Phishing

Use cases covering this technique (60)

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] Quishing delivery: inbound email with QR-code image/PDF attachment and no scannable body URL Bespoke delivery · hunting DSP [LLM] QR-code PDF phishing attachment resolving to workers.dev / pamconj M365 harvesting page (UAT-11764) Bespoke delivery · alerting DS [LLM] Inbound HTML-attachment lure exploiting Zimbra XSS (CVE-2025-66376) 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 (101)

crit CISA Flags Actively Exploited Ray Flaw That Can Trigger Browser-Based RCE art-03
high Hacker claims 3.6 million Azure account records stolen from major companies art-06
crit Cavern C2 Uses DNS and Google Apps Script to Blend Into Legitimate Traffic art-10
crit How QR-code phishing can slip past corporate security measures art-27
high SafePal data breach impacts 39,798 customers, stolen info for sale art-30
crit CTM360 Uncovers Over 3,000 Recruitment Phishing URLs Using Browser-in-the-Browser (BitB) Credential Traps art-45
crit ThreatsDay: GhostJacking AI Attacks, EtherHiding ClickFix, Cursor CLI Flaw + 17 More Stories art-51
high Curiouser and Curiouser art-52
crit AmnesiaStealer Hijacks Chromium Sessions to Give Attackers Live Browser Control on macOS art-55
crit WindRelay Android Malware Turns Victims' Phones Into NFC Relays for Payment Fraud art-58
crit Dissecting the JWR phishing framework art-60
crit Lazarus Exploits Windows Zero-Day to Gain SYSTEM Access and Deploy Backdoor art-64
crit Head Mare APT is exploiting vulnerabilities in an unpatched TrueConf server to deliver PhantomCore and PhantomGraph to video conference part art-87
high Microsoft named a Leader in the 2026 IDC MarketScape for MDR/MXDR for the Enterprise art-97
crit DeadLock ransomware: Breaking down a Rust-based encryptor with decentralized recovery infrastructure art-98
high Are AI tutors safe for your kids? art-100
crit Show, Don't Tell: What Evo Continuous Offensive Security Found in a Real Enterprise SaaS art-101
crit Inside the Modern SOC: The Identity Front Door art-102
high Why metaphor may dictate your security strategy art-110
high Token Jacking: Cybercriminals Could Be Stealing Your AI Resources art-112
crit [GHSA / CRITICAL] CVE-2026-69259: Flowise RCE via SQLite Record Manager Node art-127
high The Frontier AI Vulnerability Burst: Industrializing Autonomous Zero-Day Discovery in Open-Source Software art-131
crit How legitimate cloud platforms enable phishers to bypass MFA art-133
crit An analysis of incidents at Brazilian educational institutions art-146
crit Pass the Passkey: A Novel Attack Surface in Passwordless Authentication art-147
crit CaptiveCrunch: Midnight Blizzard targets travelers worldwide for malware delivery and credential theft art-151
crit You were onto something with “It’s the Climb,” Miley art-165
high ​​​​What’s new in Microsoft Security: July 2026 art-166
crit IR Trends Q2 2026: Phishing and weaponized remote management tools drive attack chains art-188
crit Russian Global Webmail Espionage art-217
high Iran War Cyber Threat Landscape | A Midyear Assessment on What Matters art-237
crit AI, Automation and Attacks: Unpacking the Unit 42 2026 Global Incident Response Report art-250
crit Begun, the Patch Wars have art-253
crit [GHSA / CRITICAL] CVE-2026-52881: MantisBT: Reflected XSS in admin/install.php via unescaped printf art-265
crit ESET Threat Report H1 2026 art-312
high Cyber readiness for SMBs: Getting the basics right art-322
high Inside the inbox: Why cybercriminals want to break into your email account art-337
high Gamaredon in 2025: Leveraging tunnels, workers, dead drops, and new alliances art-344
high EvilTokens: A phishing attack that doesn’t steal your password art-377
high npm v12 delivers one of the biggest security improvements in years art-385
high What MDM can't protect on developer machines (and what to do about it) art-432
crit ESET APT Activity Report Q4 2025–Q1 2026 art-433
crit BTMOB: A stealthy RAT burrowing deep into Android devices art-443
med Foul play: Fake FIFA websites target soccer fans looking for World Cup tickets, merchandise art-448
crit The Wild West of VS Code extensions and how a poisoned extension breached GitHub art-457
crit FrostyNeighbor: Fresh mischief and digital shenanigans art-481
crit PCPJack | Cloud Worm Evicts TeamPCP and Steals Credentials at Scale art-492
high Someone published four versions of a fake "tanstack" package in 27 minutes to steal your .env files art-514
high It's time to treat browser extensions like supply chain attack vectors art-522
crit New NGate variant hides in a trojanized NFC payment app art-536
high Multiple Cross-Site Scripting (XSS) Vulnerabilities in Mailcow art-546
high As breakout time accelerates, prevention-first cybersecurity takes center stage art-574
high Axios npm Package Compromised: Supply Chain Attack Delivers Cross-Platform RAT art-585
high A cunning predator: How Silver Fox preys on Japanese firms this tax season art-589
crit EDR killers explained: Beyond the drivers art-613
crit Cyber fallout from the Iran war: What to have on your radar art-626
crit Sednit reloaded: Back in the trenches art-629
crit Protecting education: How MDR can tip the balance in favor of schools art-640
crit PlugX Meeting Invitation via MSBuild and GDATA art-648
high 20+ Popular NPM Packages Compromised (Chalk, Debug, Strip-ANSI, Color-Convert, Wrap-ANSI...) art-673
crit Naming and shaming: How ransomware groups tighten the screws on victims art-678
crit Another npm Supply Chain Attack: The 'is' Package Compromise art-687
crit ESET Threat Report H2 2025 art-762
med Why Threat Modeling Is Now Even More Critical for AI-Native Applications art-802
crit Phishing Campaign Leveraging the NPM Ecosystem art-846
high Zero-day Extensive NPM Package Compromise - Shai Hulud Supply Chain Attack art-875
high npm Supply Chain Attack via Open Source maintainer compromise art-878
high Weaponizing AI Coding Agents for Malware in the Nx Malicious Package Security Incident art-888
high Snyk Joins CISA's Secure by Design Pledge art-906
crit Maintainers of ESLint Prettier Plugin Attacked via npm Supply Chain Malware art-917
crit CISA KEV: CVE-2024-38226 — Microsoft Publisher Protection Mechanism Failure Vulnerability art-1253
crit Polyfill supply chain attack embeds malware in JavaScript CDN assets art-1319
crit Snyk Learn and the NIST Cybersecurity Framework (CSF) art-1405
high Defense in Depth art-1415
crit New Year's security resolutions for 2024 from Snyk DevRel, SecRel, and friends art-1444
high Cybersecurity Venture’s 2023 Software Supply Chain Attack Report art-1561
high XS leaks: What they are and how to avoid them art-1663
high Ethical hacking techniques art-1721
high Ethical Hacking: Top Tools art-1725
crit API Security Guide art-1774
high Securing the web (forward) art-1826
crit The rising trend of malicious packages in open source ecosystems art-1827
high Cybersecurity Hygiene 101 art-1847
crit Key points from Google and Accenture's ransomware white paper art-1958
crit Secure Python URL validation art-1960
crit Understanding DNS attacks: Identifying and patching vulnerabilities art-1972
high Avoiding SMTP Injection: A Whitebox primer art-2029
high Securing PHP containers art-2105
crit Alert: LaughTilYouCry ransomware sabotages npm package (with puns) art-2365
high How Snyk helps satisfy White House cybersecurity recommendations art-2477
med Getting started at a new organization art-2686
crit The Secure Developer: 2021 in review art-2714
high How Dun & Bradstreet and Shutterstock built successful security champions programs art-3091
high Docker Hub authentication: Is 2021 the year you enable 2FA on Docker Hub? art-3219
crit What is typosquatting and how typosquatting attacks are responsible for malicious modules in npm art-3249
high Cheatsheet: top 10 application security acronyms art-3270
crit Demystifying HTTP request smuggling art-3358
high ReDoS vulnerabilities in npm spikes by 143% and XSS continues to grow art-3577
med Python 2 vs 3: Security Differences art-3655
crit XSS Attacks: The Next Wave art-3664
high Which of the OWASP Top 10 Caused the World’s Biggest Data Breaches? art-3667