You are trying to package a RAT Trojan so that Anti-Virus software will not detect it. Which of the listed technique will NOT be effective in evading Anti-Virus scanner?
A.
Convert the Trojan.exe file extension to Trojan.txt disguising as text file
B.
Break the Trojan into multiple smaller files and zip the individual pieces
C.
Change the content of the Trojan using hex editor and modify the checksum
D.
Encrypt the Trojan using multiple hashing algorithms like MD5 and SHA-1
Hmmm…ok, I understand that the first answer will not help hide my Trojan. But even so, selecting first answer implies that the last one is actually helping me hide the trojan: MD5 and SHA-1 are NOT used for encryption!
MD5 is an encryption technique. The MD5 Message-Digest Algorithm is a widely used cryptographic hash function according to:
http://en.wikipedia.org/wiki/MD5
Cheers
Read on: Like most hash functions, MD5 is neither encryption nor encoding. It can be reversed by brute-force attack and suffers from extensive vulnerabilities as detailed in the security section below.
When you hash a file, you are sending only the hash value, which is non reversible, and does not send the actual file you are hashing.