Category: Threat Hunting
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NanoCore Screen Exfiltration — The Rat That Filmed Its Own Jail
A 58 KB NanoCore RAT takes a 1920×1080 screenshot every 30.7 seconds, base64-encodes it, and POSTs it back to its command and control server in plaintext HTTP — five times in two and a half minutes, all of it inside a 1.5…
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Waski Downloader — Cloudflare Payload, Silent Callbacks
A 19 KB C++ trojan downloader drops a child process, wraps its payload fetch in a valid Cloudflare-fronted TLS session, and produces exactly zero certificate errors in 150 seconds of traffic. Then it requests /images/full/wav.exe — an executable named like an audio…
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Polish “Powiadomienie” JS Campaign — Credential Theft via FTP Exfiltration
A 3.6 MB JavaScript file, hardened with `javascript-obfuscator` — rotated string arrays, index decoders, 53 dead dispatcher functions, a catastrophic backtracking regex trap — ends with a plaintext FTP upload of your saved browser passwords. The entire malicious activity: 3 seconds. Join…
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The 1.7 MB CAPTCHA — How a Fake Human Verification Check Delivered Two RATs
A fake CAPTCHA — 1.7 MB of React 19 served from a .top domain — tricks a visitor into pressing Win+Rand pasting PowerShell. No browser sandbox escape needed. No exploit. Just social engineering. What follows is a 6-stage infection chain: The full…
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Hunting Lazy OPSEC: Spotting Default C2 Certificates with DuckDB and Zeek
Threat actors love to reuse tools, and sometimes, they get lazy. Case in point: AsyncRAT and its notorious fork, DcRAT. These remote access trojans often ship with default, self-signed certificates. If the operators don’t bother to swap them out before deploying their…
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Beyond the Grep: Hunting Malware with Zeek and DuckDB SQL
Hunting through raw Zeek logs just got a massive upgrade. If you’ve spent years in the SOC, you’ve likely built up a library of complex awk chains and grep commands to parse Zeek data. It works, but it’s brittle and hard to…
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Zeek’s suspend_processing Quirk With PCAPs
In the comments of an earlier blog: … we found an interesting situation. Even when you call “suspend_processing” in zeek_init, like this: … Zeek will still process the first packet. The “new_connection” and “connection_state_remove” events will still fire for that first packet/connection.…
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Industrial Control Systems (ICS) PCAP Resources For Zeek And Wireshark
In this video I walk through several resources to download ICS protocol PCAPs:
