> For the complete documentation index, see [llms.txt](https://book.onosh.ovh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.onosh.ovh/ctf/esnhack/exfiltration-1.md).
# EXFILTRATION 1
### Énoncé
Lors de l'intrusion, un hacker de l'ESNA a décidé d'exfiltrer de la data du serveur. Cette fois-ci, il a été plus ingénieux et a décidé de brouiller les pistes. A vous de jouer !
Créateur du challenge : [Cabir](https://cabir.fr/)
### Analyse du trafic
En ouvrant la capture avec Wireshark, on remarque qu'il y a un fort trafic http :
En suivant le flux tcp 2, on observe la requête http suivante :
```
GET / HTTP/1.1
Host: 0.0.0.0:2000
User-Agent: python-requests/2.22.0
Accept-Encoding: gzip, deflate
Accept: */*
Connection: keep-alive
Content-Length: 1
EHTTP/1.0 200 OK
Server: SimpleHTTP/0.6 Python/3.6.9
Date: Thu, 23 Apr 2020 22:59:27 GMT
Content-type: text/html; charset=utf-8
Content-Length: 559
Directory listing for /
Directory listing for /
```
En analysant plus profondément la requête GET, on remarque un transfert de data :
Plus largement, les requêtes HTTP GET sont envoyés vers 4 ports principaux, 2000,3000,4000 et 5000 sans vraiment de distinctions possibles.
### Récupération des données
Je décide donc de commencer par récupérer les données qui circulent sur les échanges à destination du port 2000.
```
onosh@kali:/mnt/v# tshark -r exfiltration1.pcapng -Y 'http.request.method == "GET" && tcp.port eq 2000' -T fields -e http.file_data |tr -d '\n'
ESNHACK{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}
```
Et bingo, je récupère le flag !
---
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