Spearphishing Response Automation
Staying Off the Hook
Spearphishing is one of the most common attack vectors for cybercriminals to infiltrate organizations globally. Phishing attack emails require relatively low effort on the part of attackers as they tend to exploit the human vulnerabilities that stand out as the weakest link in the security ecosystem. Attackers can target an organization’s employees, customers, or partners, through large-scale phishing campaigns or through specially-crafted spearphishing emails that target specific individuals at an organization. Responding to spearphishing attacks on a continuous basis is a major challenge for security teams due to the sheer volume of such emails encountered on a daily basis.
Catch More Phish with Automation
To combat spearphishing threats in a rapid and effective manner, security teams can utilize automated spearphishing response playbooks. The automated playbooks standardize the response process from detection to blocking of the malicious indicators from where attacks are sourced.
The spearphishing response playbook performs the following tasks:
Poll Dedicated Mailbox
The playbook kickstarts the phishing handling response with the polling of the dedicated mailbox on the configurable interval over the IMAP/POP3 protocol to receive the phishing emails reported by the users.
Identifying Threat Indicators
Once a phishing email is reported, it is analyzed for elements in the email headers, body, and attachments and automatically extracts relevant indicators of compromise (IOCs) such as embedded links, files, IPs, domains, email attachments, etc.
Enrichment and Analysis
The collected IOCs are then enriched with information from several entities including CTIX and other threat intelligence sources and automated triaging is then kicked off by the conditional nodes of the playbook to rate the threat level of the reported email.
If the threat is found to be a false-positive then additional steps are performed:
- Run a check on Sandbox.
- Past history of the extracted indicators
- Inspect the sender’s domain with the historical DNS information
Based on the triaging information, several response actions are initiated in real-time such as
- Blocking the sender’s email address
- Blocking malicious IOCs
- Adding IOCs to the watchlist of SIEM solution
- Looking up the email recipient in the breach DB
- Email deletion from other mailboxes and sending advisory notifications to all the impacted users
- Keeping the threat quarantined for manual investigation
Defining the Threat Horizon
The playbook automatically performs the retrospective hunt across various security technologies to identify similar threat indicators across the organization. Following that, an automated alert is then triggered to warn the affected users.
End-to-end response ensures that not only the current attack is responded to, but all possible future attacks in the similar lines of the kill chain will be prevented.
Analyze Large Volumes of Phishing Emails
By leveraging security automation in the response process, security analysts can save time and effectively respond to a large volume of spearphishing alerts.
Track Targeted Attack Campaigns
Through automated IOC extraction and enrichment with data from multiple sources, analysts can understand and counter the tactics, techniques, and procedures (TTPs) used by specific threat actors.
Stop a Variety of Attacks at an Early Stage
The playbook helps analyze a spearphishing threat in the context of the entire attack lifecycle to help block threat actors that use it as a means to infiltrate networks and deploy malware.