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.
Malware botnet controller located at 91.243.32.88 on port 80 (using HTTP GET):
hXXp://91.243.32.88/verify.php
Referencing malware binaries (MD5 hash):
a751d63055d095450ccf41ecad484077 — AV detection: 29 / 67 (43.28)
a9650583455ebb93e83a9e841bcec75e — AV detection: 44 / 66 (66.67)
d0aa9ec6193e8139ca56f599c365d2b2 — AV detection: 26 / 67 (38.81)