Beacon Activity (Suspicious) Source IP: 10.12.45.18 – an internal dev server, the Jenkins build box. Destination: 185.130.5.253:443 (Bulgaria) Signature: Potential Cobalt Strike staging request.
That was the worst part. Watching. Leila knew the playbook. If she cut the network cable, the Beacon would go dark, and the attacker would know they'd been found. They'd pivot, burn the infrastructure, and try a different way in next week. The only way to truly kill the threat was to let it live, just long enough to understand its mission.
The alert wasn’t a scream. It was a whisper.
Her coffee was cold. The threat was gone. But somewhere, in the deep quiet of the morning, she knew another Cobalt Strike request was already whispering across some other company’s firewall, looking for a reply.
The amber light on her dashboard faded to green. The "suspicious" alert was now a "confirmed incident." Leila leaned back, the glow of the screen painting dark circles under her eyes.
Her heart didn't race. It sank.
There it was. A single, innocuous-looking HTTP POST to /jquery-3.6.0.min.js . The user-agent was a standard Windows update string. Perfect camouflage. But the response size was wrong. A real JS file would be 90KB. This was 412 bytes. That wasn't a file; it was a command.
Leila’s fingers flew across the keyboard, pulling PCAPs from the span port. The raw packet capture materialized on her screen. She filtered for the conversation.