Infection & Delivery Methods

Real-world initial access vectors mapped to MITRE ATT&CK

Why This Matters

Understanding infection methods helps researchers connect payloads to real-world attack scenarios. Red teams use this for realistic simulations; blue teams for detection engineering and user awareness training. Each method below represents documented TTPs from actual threat actor campaigns.

Spear Phishing Attachment

T1566.001

Targeted email with malicious Office document containing macro

Delivery:Email attachment (.docm, .xlsm, .zip)
Example:Invoice_Q42024.xlsm with VBA macro downloading second-stage payload
Likelihood:
high

Credential Phishing

T1566.002

Link to fake login page harvesting credentials

Delivery:Email link to cloned login portal
Example:Fake MFA portal capturing session cookies
Likelihood:
high

HTML Smuggling

T1566.001

HTML attachment using JavaScript to reconstruct payload client-side

Delivery:Email attachment (.html)
Example:Blob construction + download to bypass email scanning
Likelihood:
medium

Malvertising

T1189

Compromised ad network serving exploit kits

Delivery:Legitimate websites with malicious ads
Example:RIG exploit kit landing page targeting browser vulnerabilities
Likelihood:
medium

Watering Hole

T1189

Compromising websites frequented by target audience

Delivery:Drive-by download from trusted site
Example:Industry forum compromised with XSS delivering payload
Likelihood:
medium

Typosquatting

T1566

Fake package/repository mimicking legitimate source

Delivery:npm/PyPI packages, fake download sites
Example:Malicious npm package with post-install script
Likelihood:
medium

USB Drop

T1091

Infected USB drives left in public areas

Delivery:Physical USB device with autorun or social engineering
Example:Labelled "Salary Info 2024" dropped in parking lot
Likelihood:
low

Impersonation

T1566.004

Posing as IT/vendor to gain physical or remote access

Delivery:Phone call, in-person visit, remote support scam
Example:Fake IT support convincing user to run "update tool"
Likelihood:
low

Supply Chain Compromise

T1195

Injecting malware into legitimate software updates

Delivery:Compromised vendor update mechanism
Example:CCleaner, SolarWinds-style attack
Likelihood:
low

Exploiting Public-Facing Apps

T1190

Direct exploitation of vulnerable internet-facing services

Delivery:Network exploit against web server, VPN, RDP
Example:Log4Shell, ProxyShell, Citrix CVE-2023-4966
Likelihood:
high

Lateral Movement

T1021

Spreading from initial access to other systems

Delivery:RDP, SMB, WMI, PSRemoting, SSH
Example:Pass-the-hash, credential dumping + RDP
Likelihood:
high

Research Purpose: This information is for authorized security testing, threat intelligence, and defensive operations only. All techniques documented here are based on publicly available threat actor TTPs.

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