Hi everyone!

I'm having quite a few connect attempts from foreign hosts lately,
always originating on port 80, and heading for a random port on my
system.
Here is a log sample:
Sep 18 22:19:29 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:19:31 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:19:36 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:19:42 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:19:45 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:19:46 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:19:55 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:20:03 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:20:11 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:20:39 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:20:44 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:21:39 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:21:45 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:22:39 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:22:44 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:23:39 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:23:44 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:24:39 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:24:44 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:25:39 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:25:44 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
Sep 18 22:26:39 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:4118, len 916
Sep 18 22:26:44 mikrotik Firewall-Log: input->REJECT, in:WAN,
outlocal), src-mac [MAC address], prot TCP (ACK,FIN,PSH),
[OUTSIDER]:80->[ME]:18311, len 862
What could be causing hits like these...? :-?


Regards,
Evert