5 Key Takeaways from the Cofense 2026 Mid-Year Threat Report Webinar
The Cofense 2026 Mid-Year Threat Report highlights how generative AI is transforming the phishing landscape by enabling polymorphic campaigns, highly convincing business email compromise (BEC), and the weaponization of legitimate remote access tools. The report emphasizes that traditional, indicator-based email defenses are no longer sufficient and advocates for a campaign-level defense approach that correlates behavioral patterns and infrastructure to stop modern threats.
Detection / Hunteropenrouter
What Happened
A recent security industry report explains that cybercriminals are using artificial intelligence to create phishing scams faster and in greater volume than before. These scams are highly personalized, often bypassing standard email security by avoiding suspicious links or attachments, and instead tricking employees into sending money or sensitive data. Attackers are also hijacking legitimate IT remote access tools to hide their activities while taking over computers. The report advises organizations to stop treating each suspicious email as an isolated event and instead look for broader patterns, combining employee reporting with automated tools to respond to entire campaigns rather than individual messages.
Key Takeaways
- AI is accelerating the speed, scale, and sophistication of phishing campaigns, including BEC and QR code phishing.
- Polymorphic phishing is now standard; attackers use unique URLs, attachments, and sender info per message, rendering single-IOC blocking ineffective.
- BEC attacks are increasingly convincing, using AI to generate context-aware messages that bypass traditional email security by lacking malicious links or attachments.
- Threat actors are weaponizing legitimate, digitally signed remote administration tools earlier in the attack chain to establish persistence and deploy ransomware.
- Defenders must shift from email-by-email analysis to campaign-level defense, correlating infrastructure and behavioral patterns to remediate across all affected mailboxes.
Affected Systems
- Email platforms and gateways
- Endpoints running remote administration software
Vulnerabilities (CVEs)
None identified.
Attack Chain
- Initial Access: AI-generated phishing emails or BEC messages are sent to targets, often using polymorphic techniques to evade detection.
- Execution: Victims interact with malicious content or are socially engineered into performing actions (e.g., wire transfers) without traditional payloads.
- Persistence: Attackers deploy legitimate, digitally signed remote administration tools to maintain access to compromised systems.
- Impact: Remote access tools are used to enable further intrusion, including ransomware deployment.
Detection Availability
- YARA Rules: No
- Sigma Rules: No
- Snort/Suricata Rules: No
- KQL Queries: No
- Splunk SPL Queries: No
- EQL Queries: No
- Other Detection Logic: No
The article is a summary of a webinar and does not contain specific detection rules or queries.
Detection Engineering Assessment
| Dimension | Rating | Rationale |
|---|---|---|
| EDR Visibility | Medium | EDR solutions may detect the execution and behavior of legitimate remote administration tools if process monitoring and behavioral analytics are enabled, though signed binaries may require tuning to reduce false positives. |
| Network Visibility | Medium | Network monitoring can identify anomalous outbound connections to remote access infrastructure, but distinguishing malicious use from legitimate IT administration requires baseline behavior analysis. |
| Detection Difficulty | Hard | Detecting AI-generated, payload-less BEC emails and polymorphic phishing requires advanced behavioral analysis and contextual correlation, moving beyond traditional signature and IOC-based detection. |
Required Log Sources
- Email gateway logs
- EDR process execution logs
- Network firewall/proxy logs
- Authentication logs
Hunting Hypotheses
| Hypothesis | Telemetry | ATT&CK Stage | FP Risk |
|---|---|---|---|
| Consider hunting for instances where legitimate remote administration tools are executed from unusual directories or by users who do not typically use them. | EDR process execution logs, process ancestry | Persistence | High, as IT administrators frequently use these tools legitimately. |
| Consider hunting for email threads involving financial transactions or vendor updates that lack traditional malicious indicators but originate from newly observed sender addresses. | Email gateway logs, message tracking logs | Initial Access | Medium, as legitimate new vendors or contacts may trigger alerts. |
Control Gaps
- Traditional email security gateways may fail to detect payload-less BEC emails.
- Endpoint security relying on signatures may miss weaponized legitimate remote access tools.
Key Behavioral Indicators
- Emails with contextually relevant business language but no links or attachments
- Execution of remote administration tools outside of standard IT support hours or by non-IT personnel
- Rapid changes in sender infrastructure for emails sharing similar contextual themes or objectives
False Positive Assessment
High - The use of legitimate remote administration tools and payload-less emails closely mimics normal business activities, making behavioral detection prone to false positives without proper baselining.
Recommendations
Immediate Mitigation
- Verify against your organization's incident response runbook and team escalation paths before acting. Consider reviewing recent email logs for payload-less BEC patterns or anomalous remote access tool usage.
Infrastructure Hardening
- Consider implementing application allow-listing or strict monitoring policies for remote administration tools to detect anomalous usage.
- Evaluate whether your email security solution supports campaign-level analysis and AI-driven behavioral detection rather than solely IOC-based blocking.
User Protection
- Consider deploying enhanced email authentication protocols (DMARC, DKIM, SPF) to reduce the risk of email spoofing in BEC attacks.
- If supported by your tooling, consider implementing interactive email banners that warn users of external or first-time sender emails.
Security Awareness
- Consider updating existing security awareness training to highlight the increased realism of AI-generated phishing and BEC attacks.
- Encourage employees to verify financial requests or sensitive data sharing through secondary communication channels, regardless of how legitimate the email appears.
