A trojan, or trojan horse, is a seemingly legitimate program which secretly performs other, usually malicious, functions. It is usually user-initiated and does not replicate.
Additional Details
Trojan:W32/Chifrax is a family of maliciously modified self-extracting archive executable files (SFX RAR files) that drop and execute arbitrary malware files.
The exact malware dropped on the system depends on the specific variant. Representative examples of dropped malware are: