Bjorn turns a Raspberry Pi Zero with an e-Paper HAT into an autonomous network scanner and vulnerability assessment platform for authorized security testing and lab environments.
| Tool | infinition/Bjorn — Tamagotchi-style autonomous network scanner and vulnerability assessment tool for Raspberry Pi with an e-Paper display |
| Category | Automated network reconnaissance and vulnerability assessment (Python, MIT license) |
| Primary Use | Continuous authorized scanning of lab or assessment networks: host discovery, port enumeration, nmap-based vulnerability scanning, and structured result collection |
| Safe Use | Deploy only on networks you own or have explicit written authorization to test, such as internal labs, home labs, and scoped penetration testing engagements |
| Telemetry Note | Generates significant scan and brute-force traffic that will trigger IDS/IPS, authentication failure alerts, and SIEM anomaly rules — defenders can fingerprint its aggressive nmap sweeps and credential attempts as a canary for unauthorized devices |
Bjorn is one of the more distinctive entrants in the drop-box tooling category: a Python-based, autonomous network scanner and vulnerability assessment platform designed specifically for the Raspberry Pi Zero W, with a 2.13-inch e-Paper HAT as its front-end. The project describes itself as a "Tamagotchi-like" device that continuously hunts for live hosts, open ports, and vulnerabilities, reporting progress on the e-ink display and through a web interface. With 6,276 stars, an MIT license, and a Development status badge, it is an actively maturing project that has clearly resonated with the hardware-hacking and pentesting communities. The README is explicit that the tool is for educational and authorized testing purposes only, and that framing should be taken literally — this is offensive tooling with real credential-attack capability.
Architecturally, Bjorn follows a modular orchestration pattern. The README describes combining "different actions and orchestrating them intelligently," which suggests a pipeline where each module — network scanning, vulnerability scanning, credential attacks, data extraction — feeds its findings into the next stage. Output lands in the data/output/ directory, and both the e-Paper display and the web interface surface indicators of what has been found. This is the classic drop-box model: deploy the device on a target network segment, walk away, and let it build a knowledge base of the environment autonomously. The community-driven module system, with contributions solicited for new attack modules, means the arsenal is designed to grow beyond what ships in the core repository.
The hardware constraints are unusually well documented. The stable reference platform is a Raspberry Pi Zero W running 32-bit Raspberry Pi OS bookworm (kernel 6.6, the 2024-10-22-raspios-bookworm-armhf-lite image), with the username and hostname set to bjorn. Community feedback reportedly confirms it also installs cleanly on the 64-bit Zero W 2 with the arm64-lite image. The e-Paper requirement is specific: only the v2 and v4 revisions of the 2.13-inch screen have been tested and implemented, with the author noting that v1 and v3 are unverified. Anyone building a lab unit should source the tested HAT revision rather than assuming compatibility across the product line.
Installation is handled by an automatic script: wget the install_bjorn.sh installer from the repository, chmod +x it, run it with sudo, and select option 1 for the automatic path. The README warns it takes a while because a large number of packages and modules are pulled in, and a reboot is required at the end. Detailed steps live in a dedicated INSTALL.md, with troubleshooting in TROUBLESHOOTING.md and development guidance in DEVELOPMENT.md — the documentation structure is more mature than many comparable hobbyist-offensive projects. For operators who lose track of the device on the network, the author maintains a companion repository, infinition/bjorn-detector, which discovers the deployed unit's IP address and provides an SSH launcher.
The feature set spans four domains. Network scanning identifies live hosts and open ports. Vulnerability assessment runs nmap-based vulnerability scanning against discovered services. System attacks conduct brute-force attempts against FTP, SSH, SMB, RDP, Telnet, and SQL services. File stealing extracts data from services found to be vulnerable. The README's demonstration output (explicitly labeled as a fake demo) illustrates the chain: host discovery feeding port enumeration, NmapVulnScanner flagging findings, SSHBruteforce testing credentials, and StealFilesSSH/StealDataSQL modules collecting discovered data. That chained automation — where one module's success unlocks the next — is the core design philosophy, and it is what separates Bjorn from a simple cron-driven nmap wrapper.
From a defensive perspective, Bjorn is worth studying precisely because of its traffic profile. An autonomous device performing continuous host discovery, port sweeps, nmap vulnerability scanning, and multi-service credential attacks produces a distinctive signature: sustained scan volumes from a single low-bandwidth host, repeated authentication failures across SSH/SMB/RDP/Telnet/SQL in temporal correlation, and a device that appears on the network making connections to sequential IP ranges. Blue teams should treat those patterns — especially from a Raspberry Pi-form-factor MAC prefix — as a high-fidelity indicator of an unauthorized drop box. The fact that all output is organized under data/output/ also means a seized device yields a structured record of everything it observed, which is useful for incident reconstruction.
There are operational caveats worth flagging for anyone considering a lab deployment. The project's status badge reads Development, so stability should not be assumed for long unattended runs. The installer runs as root and installs a large dependency surface, which warrants building the SD card image from a trusted base and snapshotting before deployment. The e-Paper HAT dependency means this is not portable to arbitrary hardware, and the untested v1/v3 screen revisions add procurement friction. None of these are defects per se, but they shape what kind of engagement the tool is realistic for — a scoped internal assessment or a persistent lab sensor, not a general-purpose scanner.
Where Bjorn fits in an authorized workflow is fairly clear: it occupies the same niche as commercial drop-boxes, at hobbyist cost. Deploy it on a lab network segment or within a contracted assessment's scope, let it build the host and service inventory continuously, and use its structured output as the reconnaissance feed for manual validation. The vulnerability findings from nmap scripts should be treated as leads requiring verification, not as confirmed exploitable issues, and any credential-attack modules should only ever be pointed at accounts and services within the written authorization. The web interface and e-Paper indicators make it genuinely usable as a set-and-forget inventory builder for a home lab, which is arguably its least controversial and most practical application.
The community infrastructure — an active Reddit community at r/Bjorn_CyberViking and a Discord server — suggests sustained development momentum, and the contribution model (new attack modules, bug fixes, documentation, feature improvements) indicates the module architecture is intended as the primary extension point. For defenders and researchers, that extension model is worth monitoring: modular credential-attack frameworks evolve quickly when a community forms around them. For authorized testers, Bjorn is a well-documented, hardware-native example of the autonomous drop-box pattern, and studying its orchestration design is instructive even if you never deploy it. As always with tools in this category, the README's own warning is the correct operating assumption: educational and authorized testing purposes only, with scope and written permission defined before the device ever touches a network.
infinition/Bjorn.Educational analysis for authorized security professionals. Use only in controlled, authorized environments.
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