AES-128 with weak key Doing malware research (simple crypto locker) I found out that it uses AES-128 with weak key - every one of the sixteen bytes is represented by (a-z,A-Z,0-9). Thus simple brute-force attack should iterate through $62^{16}$, that is approximately $2^{96}$ keys. I have a file before encryption and after. 

Is it feasible in modern world to brute-force it to find a key with a budget of $3-4k?
No, it's not.

Here, Bruce Schneier estimates the cost of finding a SHA-1 collision. He estimates that this would require approximately 274 CPU cycles and cost about \$700 thousand in 2015. Trying 296 AES keys would require approximately 2100 CPU cycles and cost about \$50 trillion.