Initial Access
The techniques adversaries use to establish a foothold in your environment — before any lateral movement, privilege escalation, or impact has occurred. Detecting Initial Access is the highest-leverage intervention in the kill chain.
Tactic coverage
- Sub-techniques
- 9
- ManySignal detections
- 38
- Avg. detection time
- < 4 min
Threat context
How adversaries establish initial access
Initial Access is where the breach begins. Adversaries invest heavily in this phase because the downstream attack — lateral movement, data theft, ransomware — requires a foothold. Modern initial access is dominated by three vectors: phishing (including sophisticated AiTM attacks that bypass MFA), valid account abuse using credentials obtained from prior breaches, and exploitation of internet-facing applications before patches are deployed.
In cloud-first organisations, Initial Access often means a stolen API key or federated identity token rather than a traditional network intrusion. An adversary with a compromised Okta session or AWS access key is already inside the perimeter — they never touch the corporate network. ManySignal's detection model is built for this reality: identity-first, behavioural, and cloud-native.
Techniques in this tactic
Initial Access techniques ManySignal detects
Phishing
Spearphishing, AiTM proxy, and service-based social engineering.
Valid Accounts
Credential stuffing, purchased creds, or phished passwords used to authenticate as legitimate users.
Exploit Public-Facing Application
CVE exploitation in VPN appliances, web frameworks, and enterprise portals.
External Remote Services
Abuse of VPN, RDP, Citrix, or SSH exposed to the internet.
Supply Chain Compromise
Poisoned software updates, compromised npm packages, and CI/CD pipeline injection.
Trusted Relationship
Compromise of a managed service provider or third-party contractor with access to the target.
Key mitigations for Initial Access
- Deploy phishing-resistant MFA (FIDO2 passkeys or hardware security keys) for all accounts, especially admin and privileged roles
- Implement a vulnerability management program that patches CISA KEV vulnerabilities within 24 hours on internet-facing systems
- Run continuous attack surface management (EASM) to identify exposed services and credentials before attackers do
- Enable Conditional Access policies that enforce device compliance and block high-risk sign-in states
- Monitor software supply chain with SCA tools and pin all dependencies to verified versions with checksum validation
Initial Access: frequently asked questions
What is MITRE ATT&CK Initial Access (TA0001)?
Initial Access is the first phase of the ATT&CK framework, covering the techniques adversaries use to gain a foothold in a target network or cloud environment. It includes phishing, credential abuse, exploitation, and supply chain attacks.
Which Initial Access technique is most commonly exploited?
Phishing (T1566) and Valid Accounts (T1078) together account for over 75% of confirmed initial access vectors in enterprise cloud breaches, according to incident response data. Phishing delivers credentials or malware; valid account abuse uses already-obtained credentials.
How does ManySignal detect Initial Access in cloud environments?
ManySignal correlates identity, network, and endpoint signals to detect Initial Access within minutes. For credential abuse, behavioural baselining detects anomalous sign-ins. For exploitation, EDR telemetry surfaces web server shell spawning. For supply chain, build pipeline monitoring detects dependency anomalies.
Can ManySignal prevent Initial Access, or only detect it?
ManySignal is a detection and response platform, not a prevention tool. Prevention (WAF, email security, patch management) reduces attack surface. ManySignal maximises the speed and accuracy of detection after prevention controls are bypassed or fail — minimising dwell time from weeks to minutes.
How do I map my detection coverage to Initial Access techniques?
ManySignal's Coverage Mapping feature provides a per-tenant MITRE ATT&CK heatmap showing which techniques have active detection rules, which have partial coverage, and which have gaps. Use this to prioritise detection engineering efforts.
Detect initial access before attackers pivot
See how ManySignal correlates identity, endpoint, and cloud signals to surface initial access within minutes of the first foothold.