Full Report
Protect yourself from sophisticated phishing attacks that leverage Google Calendar to steal your personal information.
Analysis Summary
# Tool/Technique: Google Calendar Phishing Scam
## Overview
This describes a phishing campaign that leverages Google Calendar event invitations to trick users into performing malicious actions, typically leading to credential harvesting or further compromise. The core mechanism relies on social engineering via calendar invites.
## Technical Details
- Type: Technique (Social Engineering/Phishing)
- Platform: Web/SaaS services (primarily Google Calendar, impacting users across various desktop and mobile operating systems)
- Capabilities: Delivery of malicious links or content disguised as legitimate event details within a calendar invitation.
- First Seen: Not specified in the context, but this is a recurring phishing vector.
## MITRE ATT&CK Mapping
Since the context describes the *use* of a feature (Calendar Invites) for phishing, the primary mapping lies in the Initial Access and Persistence categories related to phishing.
- **TA0001 - Initial Access**
- **T1566 - Phishing**
- T1566.004 - Phishing: Service Account
*(Mapping adjusted as this targets a specific service/platform feature, though it is fundamentally credential harvesting)*
## Functionality
### Core Capabilities
- **Delivery Mechanism:** Utilizing the Google Calendar invitation feature to deliver the attack payload, often embedding links or descriptions designed to look urgent or important.
- **Social Engineering:** Tricking recipients into accepting, viewing, or clicking malicious links within the event description, title, or attached notes.
### Advanced Features
- The technique leverages the legitimate functionality of a widely trusted service (Google Calendar), potentially bypassing email spam filters that would normally catch traditional phishing emails.
## Indicators of Compromise
Specific IOCs for this generalized technique are not provided in the context. When observed:
- File Hashes: [N/A]
- File Names: [N/A]
- Registry Keys: [N/A]
- Network Indicators: [Links embedded within calendar events pointing to credential harvesting sites or malicious payloads]
- Behavioral Indicators: Unsolicited calendar invitations from unknown senders, or invitations containing suspicious or urgent text prompting immediate action.
## Associated Threat Actors
The context does not name specific actors, but this technique is commonly utilized by various threat groups, including general cybercriminals focused on credential theft.
## Detection Methods
Detection focuses on user behavior and content analysis within the calendar system.
- Signature-based detection: Unlikely for the invitation structure itself unless specific malicious URLs are identified.
- Behavioral detection: Monitoring for anomalous calendar invitations sent to users, especially those containing known suspicious URLs or keywords related to urgent credential requests.
- YARA rules: Not typically applied to calendar metadata, but relevant if the invitation links to a file attachment.
## Mitigation Strategies
- Prevention measures: Educating users to be cautious of unsolicited or unexpected calendar invitations, especially those requesting immediate action or credential entry.
- Hardening recommendations: Configuring email/calendar settings to limit who can invite users to events (e.g., restrict to contacts only, or require invitation acceptance before visibility). Disabling automatic addition of invitations lacking security vetting.
## Related Tools/Techniques
- T1566.001 - Phishing: Spearphishing Attachment (if attachments are used)
- T1566.002 - Phishing: Spearphishing Link (if links are the primary payload)
- Use of legitimate services for C2/delivery (Living off the Land approach for social engineering).