Pense bête

perl 7z2hashcat.pl ../tmp/backup.7z > ../tmp/hash.txt
#ou 
7z2john.py archive.7z > hash.txt

ensuite (https://infinitelogins.com/2020/04/29/how-to-crack-encrypted-7z-archives/) :

hashcat -m 11600 lightweight7z.hash /usr/share/wordlists/rockyou.txt

ou (https://bytesoverbombs.io/cracking-everything-with-john-the-ripper-d434f0f6dc1c)

/usr/sbin/john --wordlist=/usr/share/wordlists/rockyou.txt id_rsa.hash 

En ligne de commande :

cat /usr/share/wordlists/rockyou.txt|while read line; do 7z e backup.7z -p"$line" -oout; if grep -iRl SSH; then echo $line; break;fi;done
cat /usr/share/wordlists/rockyou.txt|while read line; do if ssh-keygen -p -P "$line" -N password -f id_rsa; then echo $line; break;fi;done