Two separate issues I believe...
Aggressive Valid AUTH attempts... EHLO/STARTTLS/AUTH LOGIN/QUIT
All from MWHPR01MB2336.prod.exchangelabs.com
Feb 9 10:06:09 fe1 msd[4699]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:10 fe1 msd[4709]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:11 fe1 msd[4731]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:13 fe1 msd[4770]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:13 fe1 msd[4793]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:13 fe1 msd[4813]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:14 fe1 msd[4832]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:14 fe1 msd[4842]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:14 fe1 msd[4847]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:14 fe1 msd[4849]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:16 fe1 msd[4894]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:17 fe1 msd[4905]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:19 fe1 msd[4937]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:22 fe1 msd[5013]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:23 fe1 msd[5023]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:23 fe1 msd[5025]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:24 fe1 msd[5030]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:24 fe1 msd[5034]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:24 fe1 msd[5041]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:25 fe1 msd[5044]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:25 fe1 msd[5050]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:26 fe1 msd[5070]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:27 fe1 msd[5081]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:27 fe1 msd[5082]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:28 fe1 msd[5089]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:29 fe1 msd[5101]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:29 fe1 msd[5105]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:29 fe1 msd[5108]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:30 fe1 msd[5132]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:30 fe1 msd[5155]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:31 fe1 msd[5187]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:31 fe1 msd[5193]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:31 fe1 msd[5199]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:32 fe1 msd[5226]: AUTH success: [<same_email_address>]
(40.97.117.181)
Feb 9 10:06:33 fe1 msd[5240]: AUTH success: [<same_email_address>]
(40.97.117.181)
On 18-02-09 11:08 AM, Brandon Long via mailop wrote:
I'm confused, the first post said valid credentials, is that what
everyone else is seeing?
Nearly all valid creds seems weirder than mostly invalid... modulo
whatever amount of hijacked or reused creds there are.
Brandon
On Fri, Feb 9, 2018, 10:59 AM Rich Kulawiec <r...@gsp.org
<mailto:r...@gsp.org>> wrote:
On Fri, Feb 09, 2018 at 09:56:43AM +0100, Dan Malm wrote:
> I'm seeing an extreme amount of SMTP authentications (over 600/s)
[snip]
I wouldn't characterize what I've seen as "extreme" at any of the
observation points I'm monitoring, but I have seen a moderate number of
repeated attempts to authenticate against a mix of existing/non-existing
accounts, some of which happened slowly and some of which were rapid.
I used the past tense there because my response was to firewall
out (what I believe to be) the relevant ranges from access to
POP(S)/IMAP(S)/submission as applicable to various servers.
---rsk
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