Clever Geek Handbook

I watched my traffic: he knew everything about me (Mac OS Catalina)

a man with a paper bag on his head
a man with a paper bag on his head

Today, after updating Catalina from 15.6 to 15.7, the Internet speed dropped, something was heavily loading my network and I decided to look at the network activity.

Run tcpdump for a couple of hours:

sudo tcpdump -k NP > ~/log

And the first thing that caught my eye:

16:43:42.919443 () ARP, Request who-has 192.168.1.51 tell 192.168.1.1, length 28
16:43:42.927716 () ARP, Request who-has 192.168.1.52 tell 192.168.1.1, length 28
16:43:42.934112 () ARP, Request who-has 192.168.1.53 tell 192.168.1.1, length 28
16:43:42.942328 () ARP, Request who-has 192.168.1.54 tell 192.168.1.1, length 28
16:43:43.021971 () ARP, Request who-has 192.168.1.55 tell 192.168.1.1, length 28

Why does he need my entire local network? It scans it endlessly every minute 192.168.1./255, okay, let's say it's a network browser service.

(shadowserver.org) - Non-profit security organization

16:43:33.518282 () IP scan-05l.shadowserver.org.33567 > 192.168.1.150.rsync: Flags [S], seq 1527048226, win 65535, options [mss 536], length 0

(scanner-12.ch1.censys-scanner.com -> censys.io):

16:44:16.254073 () IP scanner-12.ch1.censys-scanner.com.62651 > 192.168.1.150.8843: Flags [S], seq 1454862354, win 1024, options [mss 1460], length 0

, , : , , , :

16:15:56.603292 () IP 45.129.33.152.51777 > 192.168.1.150.jpegmpeg: Flags [S], seq 2349838714, win 1024, options [mss 536], length 0

ip http://45.129.33.152, :

Text files contain millions of ip addresses with ports.
ip .

temp:

[?1h=[?25l[H[J[mtop - 21:17:26 up 31 days,  6:44,  1 use[m[39;49m[m[39;49m[K
Tasks:[m[39;49m[1m 144 [m[39;49mtotal,[m[39;49m[1m   1 [m[39;49mrunning,[m[39;49m[1m 143 [m[39;49msleep[m[39;49m[m[39;49m[K
%Cpu(s):[m[39;49m[1m  0.8 [m[39;49mus,[m[39;49m[1m  0.0 [m[39;49msy,[m[39;49m[1m  0.0 [m[39;49mni,[m[39;49m[1m 92.0[m[39;49m[m[39;49m[K
KiB Mem :[m[39;49m[1m 32681700 [m[39;49mtotal,[m[39;49m[1m 18410244 [m[39;49mfree,[m[39;49m[m[39;49m[K
KiB Swap:[m[39;49m[1m 16449532 [m[39;49mtotal,[m[39;49m[1m 16449288 [m[39;49mfree,[m[39;49m[m[39;49m[K
[K
[7m  PID USER      PR  NI    VIRT    RES [m[39;49m[K
[m    1 root      20   0  191072   3924 [m[39;49m[K
[m    2 root      20   0       0      0 [m[39;49m[K
[m    3 root      20   0       0      0 [m[39;49m[K
[m    5 root       0 -20       0      0 [m[39;49m[K
[m    7 root      rt   0       0      0 [m[39;49m[K
[m    8 root      20   0       0      0 [m[39;49m[K
[m    9 root      20   0       0      0 [m[39;49m[K
[m   10 root      rt   0       0      0 [m[39;49m[K
[m   11 root      rt   0       0      0 [m[39;49m[K
[m   12 root      rt   0       0      0 [m[39;49m[K
[m   13 root      20   0       0      0 [m[39;49m[K
[m   15 root       0 -20       0      0 [m[39;49m[K
[m   16 root      rt   0       0      0 [m[39;49m[K[H[mtop - 21:17:29 up 31 days,  6:44,  1 use[m[39;49m[m[39;49m[K

%Cpu(s):[m[39;49m[1m  0.0 [m[39;49mus,[m[39;49m[1m  0.0 [m[39;49msy,[m[39;49m[1m  0.0 [m[39;49mni,[m[39;49m[1m100.0[m[39;49m[m[39;49m[K
KiB Mem :[m[39;49m[1m 32681700 [m[39;49mtotal,[m[39;49m[1m 18409876 [m[39;49mfree,[m[39;49m[m[39;49m[K

[K

:

16:16:07.022910 () IP 059148253194.ctinets.com.58703 > 192.168.1.150.4244: Flags [S], seq 2829545743, win 1024, options [mss 536], length 0
16:15:57.133836 () IP 45.129.33.2.55914 > 192.168.1.150.39686: Flags [S], seq 700814637, win 1024, options [mss 536], length 0
16:15:56.603292 () IP 45.129.33.152.51777 > 192.168.1.150.jpegmpeg: Flags [S], seq 2349838714, win 1024, options [mss 536], length 0
16:16:15.083755 () IP 45.129.33.154.55846 > 192.168.1.150.7063: Flags [S], seq 4079154719, win 1024, options [mss 536], length 0
16:15:43.251305 () IP 192.168.1.150.60314 > one.one.one.one.domain: 3798+ PTR? 237.171.154.149.in-addr.arpa. (46)
16:16:24.386628 () IP 45.141.84.30.50763 > 192.168.1.150.12158: Flags [S], seq 572523718, win 1024, options [mss 536], length 0
16:16:44.817035 () IP 92.63.197.66.58219 > 192.168.1.150.15077: Flags [S], seq 4012437618, win 1024, options [mss 536], length 0
16:15:43.172042 () IP 45.129.33.46.51641 > 192.168.1.150.bnetgame: Flags [S], seq 362771723, win 1024, options [mss 536], length 0
16:17:02.120063 () IP 45.129.33.23.42275 > 192.168.1.150.11556: Flags [S], seq 3354007029, win 1024, options [mss 536], length 0
16:16:00.589816 () IP 45.129.33.3.56005 > 192.168.1.150.40688: Flags [S], seq 2710391040, win 1024, options [mss 536], length 0

ip host, ip, , .

host *.example.com

, , ( ), !



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