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- Attacks, Malware & exploits
PEERSTITCH malware exploited FortiManager to expose 500+ firewalls, evade detection inside FortiOS memory, and maintain stealthy access. PEERSTITCH, a stealthy implant deployed during a prolonged intrusion, helped attackers maintain access to a telecom managed service provider after compromising its FortiManager appliance. Palo Alto Networks Unit 42 documented the operation, which began in September 2024 and…
Keeping malware out
- Keep operating systems, browsers and plugins patched – most malware arrives through known holes.
- Block macros and scripts from the internet, and let only approved software run where you can.
- Watch endpoint alerts for new persistence: scheduled tasks, services and run keys.
More helpNCSC: mitigating malware and ransomware attacks (opens in a new tab)
Defender’s notebook
The attacker technique behind this story, in MITRE’s terms – and what to check in your own estate.
Trusted Relationship
Initial AccessWhat a defender checks
- List the suppliers with access into your systems, and how they connect.
- Give third parties separate, least-privilege accounts – and monitor them.
- Ask the supplier for indicators of compromise and a timeline.
Build the skillBlue Team Engineer · Risk Assessment & Recommendations Reporting
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In our Blue Team Analyst programme you run a vulnerability scan, prioritise the output with CVSS, EPSS and asset criticality, and track remediation to closure with the teams who own the fix.
- Read scanner output properly
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- Track remediation to closure
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