Anti-debugging IsDebuggerPresent Debugger/tool window detection Timing (rdtsc/GetTickCount) PEB BeingDebugged / NtGlobalFlag INT3 / 0xCC breakpoint scan ptrace (Linux) Exception-based (SEH/VEH/INT2D) Hardware breakpoints (DRx) NtQueryInformationProcess OutputDebugString CheckRemoteDebuggerPresent TLS callback Anti-dump Parent-process check Anti-attach / thread suspension DbgBreakPoint/DbgUiRemoteBreakin patch CloseHandle invalid-handle String / data encryption XOR AES (encryption) RC4 (encryption) TEA / XTEA (encryption) Substitution / table Packer Other named (Morphine/Neolite/PEtite…) Code virtualization / VM Control-flow obfuscation Spaghetti / junk-branch Exception / interrupt-based Indirect / computed jumps & calls State machine / dispatcher Control-flow flattening (CFF) Return-address / stack-based Anti-disassembly Junk / garbage bytes Malformed PE / bad bytes (UD2) Opaque predicates Overlapping / misaligned instructions Jump-based desync Anti-tamper / integrity Import / API obfuscation Custom / generic obfuscation Anti-VM / sandbox Nag / trial

MentalistFromXk on 2026-09-08 12:51: [Click to reveal]Beautifully built got through the packer and both VMs - the sliding-window bytecode is a great touch, no dump ever shows you the program. Stuck on the data-dependent pass: index and rotation come from the data, so SAT just stalls. Checksums as keys rather than comparisons - no branch to patch. Very nice

naijii on 2026-09-08 13:25: [Click to reveal]Nice crackme! gamers 2774-8852-F1D9-648A

asddsada on 2026-09-15 04:28: What is the writeup for this challenge? Is there anything like a flag or key? I can't find it at all.

Fl0sec on 2026-09-15 14:10: [Click to reveal]- stage-zero unpacker and manual mapper - the whole anti-debug and integrity architecture, including the detection-as-key-corruption design - .smc decrypted, with the verdict equation and both messages recovered offline - the VM lifted to a disassembler, a CFG, an SSA IR, and the full ten-round algebra - an emulator now verified against the real instruction stream. But now just a boring expensive preimage attack on a custom 10-round ARX construction. So what the point ? does it satisfiable by some input ?

Fl0sec on 2026-09-15 15:02: @ArasElmas don't bother attempting this as long as the author does not confirm that a valid password actually exists and is reachable in practice, rather than a brute-force target with 2⁵⁶+ possibilities that would take years to search. (a 10-round custom ARX/indexed transform over a 32-byte state must equal a hardcoded 32-byte table. Only the first 30 input bytes enter the state. The check does not short-circuit — it OR-accumulates all 32 byte differences — so there is no timing or positional oracle) Cube-and-conquer partitions return neither SAT nor UNSAT because each cube still covers ~2⁴⁶ candidates.

Show all spoilers