Phishing

What is Phishing?

Phishing is a social engineering technique where adversaries send fraudulent electronic messages to gain access to victim systems or credentials. Attackers craft convincing emails, text messages, or other digital communications that appear to originate from trusted sources such as financial institutions, colleagues, or well-known services. The malicious content typically contains links to credential harvesting sites, attachments containing malware, or requests for sensitive information. Spearphishing targets specific individuals using personalized content gathered through open-source intelligence, making detection significantly harder. Organizations face phishing attacks that range from mass commodity campaigns to highly targeted operations conducted by nation-state actors. Successful phishing can lead to credential theft, malware installation, or direct unauthorized access to corporate systems, making it one of the most prevalent initial access vectors observed in real-world intrusions.

“Phishing is documented as technique T1566 in the MITRE ATT&CK knowledge base under the Initial Access tactic. Detection requires visibility into SIEM, Firewall telemetry.”

Detection Strategies

The following detection strategies help SOC analysts identify Phishing activity. These methods apply across SIEM, Firewall environments and can be implemented as detection rules, correlation queries, or behavioral analytics in your security platform.

1. 1

   Monitor email gateway logs for messages with mismatched sender display names and actual email addresses, paying particular attention to domain typosquatting patterns such as substituting similar-looking characters.

2. 2

   Analyze URL click patterns in email security tools and proxy logs for newly registered domains, domains with low reputation scores, or domains that redirect through multiple hops before reaching a final destination.

3. 3

   Inspect email attachments for macro-enabled Office documents, password-protected archives, and double-extension files that are commonly used to bypass basic file type filters in email security gateways.

4. 4

   Correlate user authentication events with phishing simulation data and email delivery timestamps to identify accounts that may have submitted credentials to harvesting pages shortly after receiving suspicious messages.

5. 5

   Deploy honeypot email addresses in the corporate directory and alert on any messages delivered to those addresses, which provides high-fidelity signals of active phishing campaigns targeting the organization.

6. 6

   Review DNS query logs for domains queried immediately after suspicious email delivery, focusing on domains registered within the past 30 days or those using dynamic DNS providers frequently abused by threat actors.

Example Alerts

These realistic alert examples show what Phishing looks like in your security tools. Use them to tune detection rules and train analysts to recognize true positives versus false positives in live environments.

Frequently Asked Questions

How do SOC analysts detect Phishing?

SOC analysts detect Phishing (T1566) by monitoring SIEM, Firewall telemetry for behavioral anomalies and specific indicators. Key detection methods include monitor email gateway logs for messages with mismatched sender display names and actual email addresses, paying particular attention to domain typosqu. SOCSimulator provides hands-on practice detecting this technique with realistic alerts.

What security tools are used to detect Phishing?

Phishing can be detected using SIEM, Firewall platforms. SIEM tools are particularly effective for this technique because they provide visibility into the initial access phase of the attack chain. SOCSimulator simulates all three tool types for hands-on training.

How common is Phishing in real-world attacks?

Phishing is a well-documented MITRE ATT&CK technique in the Initial Access tactic. It appears in threat intelligence reports from multiple security vendors and has been observed in campaigns by various threat actor groups. SOCSimulator includes realistic Phishing scenarios based on documented attack patterns, helping analysts build detection intuition.

Can I practice detecting Phishing for free?

Yes. SOCSimulator offers free forever access to training scenarios, including Initial Access techniques like Phishing. You can investigate realistic alerts in guided Operations rooms, build detection skills with SIEM, XDR, and Firewall interfaces, and test yourself under pressure in Shift Mode. No credit card required.