1 Topic by jsmith

  • jsmith
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  • Posts: 32

Topic: What is this suspicious outgoing traffic?

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): - 1.3, downloadable
- Linux/BSD distribution name and version: debian stretch
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): ldap
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? no
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

I originally posted here and did not see the replies later, and the topic is closed.

https://forum.iredmail.org/topic17060-v … erver.html

Is there any reason I would see such traffic going out from an iredmail server? I don't see why in the older post I would see attempts to reach VPN or game ports?

Example traffic destinations (all source ports are 80):

54.37.244.206:4500
ns3114160.ip-54-37-244.eu

45.61.142.130:6672
amsterdam-premium-game-1.octovpn.net

195.62.46.92:25565
edge1.ger.enterprise.tcpmitigate.xyz

144.217.178.39:8081
ip39.ip-144-217-178.net



Today I'm seeing traffic from HTTP and SSH ports to random high number ports. Can anyone explain why this would be? Thank you.

    Jul 11 12:09:43     MyInterface     MyIP:22        182.131.30.53:58914        TCP:SA
    Jul 11 12:09:27     MyInterface     MyIP:22        182.131.30.53:58914        TCP:SA
    Jul 11 12:09:19     MyInterface     MyIP:22        182.131.30.53:58914        TCP:SA
    Jul 11 12:09:15     MyInterface     MyIP:22        182.131.30.53:58914        TCP:SA
    Jul 11 12:09:13     MyInterface     MyIP:22        182.131.30.53:58914        TCP:SA
    Jul 11 11:44:37     MyInterface     MyIP:22        61.177.172.160:44213        TCP:SA
    Jul 11 11:44:21     MyInterface     MyIP:22        61.177.172.160:44213        TCP:SA
    Jul 11 11:44:13     MyInterface     MyIP:22        61.177.172.160:44213        TCP:SA
    Jul 11 11:44:09     MyInterface     MyIP:22        61.177.172.160:44213        TCP:SA
    Jul 11 11:44:07     MyInterface     MyIP:22        61.177.172.160:44213        TCP:SA
    Jul 11 11:20:00     MyInterface     MyIP:80        112.94.99.142:13807        TCP:FPA
    Jul 11 11:19:18     MyInterface     MyIP:80        112.94.99.142:13807        TCP:FPA
    Jul 11 11:18:58     MyInterface     MyIP:80        112.94.99.142:13807        TCP:FPA
    Jul 11 11:18:48     MyInterface     MyIP:80        112.94.99.142:13807        TCP:FPA
    Jul 11 11:18:43     MyInterface     MyIP:80        112.94.99.142:13807        TCP:FPA
    Jul 11 11:18:41     MyInterface     MyIP:80        112.94.99.142:13807        TCP:FPA
    Jul 11 11:18:39     MyInterface     MyIP:80        112.94.99.142:13807        TCP:FPA
    Jul 11 11:18:39     MyInterface     MyIP:80        112.94.99.142:13807        TCP:FPA
    Jul 11 11:17:49     MyInterface     MyIP:22        141.98.11.113:54696        TCP:FA
    Jul 11 11:16:53     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:16:21     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:16:04     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:15:56     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:15:52     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:15:50     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:15:49     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:15:49     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:15:48     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:15:48     MyInterface     MyIP:22        141.98.11.113:54696        TCP:PA
    Jul 11 11:15:48     MyInterface     MyIP:22        141.98.11.113:54696        TCP:A

----

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2 Reply by jsmith

  • jsmith
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Re: What is this suspicious outgoing traffic?

The from port 80 and 22 traffic has been explained, it's a response to incoming requests so it isn't originating from iredmail. Still wondering what happened previously though.

3 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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  • Registered: 2009-05-06
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Re: What is this suspicious outgoing traffic?

There's no detailed info for troubleshooting, and no one can login to your server via ssh to troubleshoot, so i'm afraid that you have to figure it out by yourself.

4 Reply by dave.opc

  • dave.opc
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Re: What is this suspicious outgoing traffic?

i guess80 and 22 are destination ports.
Probably it's better to paste full screenshot, with the command you are trying to identify traffic