The host at this IP address is running a malware botnet controller which is being used to control infected computers (bots) around the globe using a trojan horse.
Gozi botnet controller located at 143.198.56.58 on port 80 (using HTTP GET):
hXXp://143.198.56.58/peer/XXX
Referencing malware binaries (MD5 hash):
83c0ef52beab49e8094e11b315220f78 — AV detection: 26 / 70 (37.14)