reversePromedium

I love tea

ringzer0ctf

Task: a 35 MB Windows PE self-extracting archive hides a Java login app; find the password. Solution: unpack the 7-Zip SFX, RC4-decrypt the embedded encrypted.class, then invert the custom XXTEA-like 64-bit block transform and confirm with MD5.

rc4 md5 java_bytecode reflection pe_sfx_7zip embedded_jar xxtea

java_reflectionmd5_verificationrc4_decryptionpe_sfx_7zip_extractionjavap_disassemblyblock_cipher_inversion

$ ls tags/ techniques/

rc4 md5 java_bytecode reflection pe_sfx_7zip embedded_jar xxtea

java_reflectionmd5_verificationrc4_decryptionpe_sfx_7zip_extractionjavap_disassemblyblock_cipher_inversion

Analysis

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Permission denied (requires tier.pro)

Sign in to access full writeups

$sign in

$ cat writeup.md…

Sign in to access full writeups

Sign in to access full writeups

Similar writeups