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Persistence Through Service Workers-Part 3: Easy…

ID: fce71469-182e-5eab-9905-f5fe7002c06d

STIX ID: report--fce71469-182e-5eab-9905-f5fe7002c06d

Feed Name: TrustedSec blog

Threat Score
60/100

Date Published: 2025-03-24

Date Updated: 2026-05-01

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This report demonstrates a practical persistence and C2 technique: deploying a malicious service-worker-based payload across many JavaScript files in a web application (example: WordPress) using a small uniqueness-check snippet and an automated bash installer to ensure the payload runs only once per browser. The write-up includes code examples, console output screenshots, and references to Shadow Workers tooling, aimed at maximizing attacker-controlled execution in administrative browsers while minimizing deployment effort.

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