The attack becomes much harder to stop with attachment scanning alone. Real identities and trusted delivery channels increase click confidence, while in-memory execution reduces file artifacts for endpoint tools to inspect. The result is a more reliable path to second-stage payloads and command-and-control traffic, so organisations need layered detection and response across identity, email, endpoint, and network controls.
How real identities change the phishing success path
When a campaign uses real people, real brands, or real organisational context, the lure no longer depends on a crude spoof. The recipient sees a credible sender relationship, familiar language, or a plausible business workflow, which narrows the window for suspicion. That matters because the initial decision to open, trust, or forward the message is often the point of failure, not the payload itself.
The practical effect is that defenders must treat trust signals as part of the attack surface. A message can be malicious even when it looks operationally ordinary, and the strongest indicator may be the combination of identity context, timing, and delivery path rather than any single malicious indicator.
Trusted identity cues are easier to abuse when users rely on visual familiarity instead of independent verification, which is why layered controls such as email security, sender authentication, and user reporting remain important. For broader control design, CIS Controls v8 provides a useful baseline for account management, audit logging, and malware defence.
Why Google Drive delivery often evades simple file-based inspection
Using Google Drive as the delivery mechanism changes the inspection problem. The initial link may point to a legitimate cloud service, so the malicious content is hidden behind a trusted storage and sharing layer rather than attached directly to the email. That can reduce the value of attachment scanning, blocklists built around file types, and simplistic URL reputation checks.
This delivery path also fragments detection. Email security may only see a benign link, cloud controls may only see normal document access, and the actual malicious intent emerges only after the user follows the share link and fetches the second-stage content. In practice, that means the organisation needs visibility across email, cloud access, browser activity, and subsequent network traffic, not just one gateway.
Defenders should assume that trusted cloud sharing can be used as a staging layer, not as proof of safety. Guidance on phishing-resistant authentication and stronger trust signals is reinforced by NIST SP 800-63 Digital Identity Guidelines, while NIST Cybersecurity Framework 2.0 helps teams structure detection and response across identity, protect, detect, and respond activities.
What in-memory execution changes about detection and response
In-memory malware execution is designed to leave fewer durable artifacts on disk. Instead of dropping an obvious executable that a scanner can quarantine, the payload may run from memory, inject into another process, or use script-based execution that degrades traditional file-centric inspection. That does not make the attack invisible, but it shifts the defender’s evidence from files to behaviour.
The consequence is that endpoint teams need to watch process lineage, script activity, abnormal memory usage, suspicious child processes, and command-and-control connections. When file artifacts are scarce, telemetry quality becomes more important than signature volume. This is also why network detection and endpoint response need to be correlated, because one control layer may only show execution while another shows exfiltration or beaconing.
Where the execution chain involves malware delivery, process injection, credential access, or lateral movement, MITRE ATT&CK Enterprise Matrix is a strong reference for mapping attacker behaviour to detections, and NIST SP 800-53 Rev 5 Security and Privacy Controls provides control families for system integrity, audit, and identification and authentication.
Risk and Threat Considerations
Campaigns that combine trusted identity cues, cloud-hosted delivery, and fileless execution are dangerous because each layer compensates for the weaknesses of the others. The email looks believable, the delivery channel looks legitimate, and the payload leaves fewer artifacts, so the attack can progress further before it is noticed.
Failure mechanism: The attacker gains execution by abusing trust in familiar identities and cloud services, then shifts payload execution into memory to reduce file-based detection and prolong access.
Impact: The likely outcome is faster credential theft, more reliable second-stage payload delivery, and greater risk of command-and-control traffic, endpoint compromise, and downstream account abuse.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while CIS Controls v8, NIST CSF 2.0, NIST SP 800-53 Rev 5 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-8 — Audit Log Management | Email-to-cloud-to-endpoint attacks require correlated logging across layers. |
| Recommendation — Centralise logs from identity, email, cloud, endpoint, and network sources. | ||
| NIST CSF 2.0 | DE.CM-01 — Network Monitoring | Beaconing and command-and-control traffic are a core detection signal here. |
| Recommendation — Monitor network traffic for suspicious outbound connections and beaconing patterns. | ||
| NIST SP 800-53 Rev 5 | SI-3 — Malicious Code Protection | The attack hinges on malware delivery and execution despite trusted delivery paths. |
| Recommendation — Deploy malicious code protections across email, endpoint, and script execution paths. | ||
| MITRE ATT&CK | T1055 — Process Injection | In-memory execution often uses process injection or similar fileless techniques. |
| Recommendation — Map endpoint detections to process-injection and other fileless execution techniques. | ||
| OWASP ASVS | V16 — Security Logging and Error Handling | The pattern depends on visibility gaps across services and runtime behaviour. |
| Recommendation — Ensure security events are logged where identity, delivery, and execution decisions occur. | ||
Practitioner Guidance
What to verify: Do not treat cloud-delivered files as safe just because they arrive through a reputable platform. Verify whether the message path, sender identity, sharing permissions, and destination document are consistent with normal business behaviour before relying on attachment controls.
What to measure: Track how many suspicious campaigns are first detected by identity analytics, email filtering, endpoint telemetry, or network alerts, because a healthy program should not depend on only one of those layers for coverage.
Practitioner takeaway: The key judgement is to stop thinking in terms of “file versus no file” and instead defend the whole delivery-to-execution chain, because the attack succeeds when trust, cloud distribution, and runtime behaviour are each allowed to look normal in isolation.
Related resources from NHI Mgmt Group
- What happens when a phishing campaign combines OneDrive links, macros, and PowerShell execution?
- What happens when a malware campaign combines a decoy file, autostart persistence, and scheduled or on-demand module execution?
- What happens when a phishing campaign delivers malware through trojanized software instead of obvious attachments?
- What happens when phishing leads to malware delivery through HTML smuggling instead of direct credential theft?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 27, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
