Flowseal Zapret Discord‑YouTube 1.9.9c release adds new bypass

Zapret Discord‑YouTube v1.9.9c was released on GitHub, adding a new “ALT12” bypass strategy and correcting false‑positive detections that previously triggered antivirus alerts [4]. The update matters for users in regions where ISPs block Discord, YouTube, and similar services, because the tool manipulates traffic at the kernel level to evade Deep Packet Inspection (DPI).

How Zapret works

Zapret is a Windows‑only DPI‑bypass system that intercepts packets via the WinDivert64.sys driver and forwards them to a user‑mode process (winws.exe) for manipulation [1]. The core techniques include packet desynchronisation, fake packet injection, multi‑split fragmentation, timestamp fooling, and TLS‑handshake modification, all designed to confuse ISP pattern matching while preserving protocol compatibility. Users can select from 11+ pre‑configured strategies through batch scripts (e.g., general.bat, service.bat) that ultimately launch winws.exe with specific command‑line arguments such as --wf-tcp=80,443 and --dpi-desync-fake-tls=bin/tls_clienthello_www_google_com.bin [1].

Recent changes and community feedback

The 1.9.9c release not only adds the ALT12 strategy—an evolution of ALT11 targeting YouTube and Discord UDP traffic—but also resolves a long‑standing false detection issue that caused some antivirus programs to block the installer [4]. Contributors noted that the console window title was also corrected, improving usability for operators who run the tool as a Windows service via service.bat. Earlier releases (1.9.8c, 1.9.8b) introduced updates to IPSet lists, timestamps handling, and game‑filter modes, reflecting an ongoing effort to keep the bypass effective against evolving ISP filters [4].

A side discussion on the project’s GitHub issue tracker highlighted a Bitcoin address (1C5vZVSbizPeZ8ydTYhUfm4LA2cNwBfcYh) embedded in a file under the bin directory, prompting questions about its purpose [2]. The repository does not clarify the address, and the comment was framed as a curiosity rather than a claim about funding or ownership.

What to watch

• Version updates – Future releases may add new strategies or further harden the tool against DPI detection; monitor the GitHub releases page for changelogs.
• Antivirus responses – Although false detections were fixed in 1.9.9c, any resurgence of AV blocks could affect user adoption; watch for community reports.
• Regulatory environment – Changes in Russian or other jurisdictions’ internet‑filtering policies could influence demand for Zapret‑type tools.

The latest release underscores the cat‑and‑mouse dynamic between DPI‑bypass utilities and ISP filtering mechanisms. As ISPs refine detection algorithms, tools like Zapret must continuously adapt, making each new version a bellwether for the broader censorship‑circumvention landscape.