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Case study

Feishu: an author-reported isolated second app instance

The author reports using Codex and REA analysis to adapt a separate macOS Feishu copy with its own application identity, data directory and single-instance lock. The account describes local signing and separation checks while retaining the original app unchanged.

Targets
App
Category
Community REA investigations
Relationship
Author-reported mixed workflow
Sources reviewed

Requirements & limits

  • Scope: The report targets Feishu 8.1.17 with REA 6.5.0 on the author’s Mac; reported elapsed times and isolation results.
  • Scope: The modified copy is locally signed and has automatic updates disabled. The article does not publish a redistributable replacement app or original-source reconstruction.
  • Attribution: The author attributes some architecture tracing directly to Codex and cites prior feishu-clone work.
  • Limits: Original hash/signature and process/data separation checks are author-reported.

About this entry

The description was reviewed against primary sources.

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Primary sources

  1. https://benx.ai/blog/posts/rea-reverse-engineer-feishu-dual-instance/

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