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Questions tagged [brute-force-attacks]

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Apache responds to attacker with status code 200 for non-existent URLs while everyone else gets 404

I'm maintaining an Apache / PHP-FPM setup with multiple vhost configurations and one of these vhosts has been illegally pentested by someone. It's running a rather outdated Laravel CMS using a custom ...
g5000's user avatar
  • 1
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0 answers
20 views

Monitor outgoing connections with timestamp and process [duplicate]

Actually, I have a CentOS 8 server which is executing brute force attack to other servers. But I have no idea what application or process is performing this attack. I wish to know if there's any tool ...
Keshav Boodhun's user avatar
-1 votes
2 answers
669 views

Postfix smtpd and smtp restrictions (client, sender, recipient) first restriction that matches wins very ILLOGICAL for brute force attacks

if I have a list of restrictions for: smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_rhsbl_helo dbl.spamhaus.org, reject_rhsbl_reverse_client dbl.spamhaus....
Digital Joe George's user avatar
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0 answers
34 views

Detect website attack by using azure sentinel serviceazure

I have a website which builds on AKS. I'm getting DDoS and other kind of attacks in website. In order to take prevention against such attacks, I'm planning to use the tool Azure Sentinel service. ...
Nandhana Pramod's user avatar
0 votes
1 answer
763 views

I am continuously getting Audit Failure on the computer. Does that mean someone is trying to brute force to the computer?

I am getting lots of Audit Failure errors on Windows Logs/Security in event viewer. See the image below. Does that mean someone is trying to brute-force to my computer?
Mohammad Taherian's user avatar
-2 votes
1 answer
87 views

Block unusual traffic from LAN on Switch [closed]

I was wondering if on HP Switches (2920 for example) is there something like storm control but for unicasts? Let's assume, we have a host in our network who bruteforces some random IP addresses. How ...
Artur's user avatar
  • 7
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0 answers
202 views

Gitea instance is being brute-forcely attacked

My Gitea instance is being brute-forced just as I write this text: gitea | Invalid user yinsen from 94.23.30.184 port 55154 gitea | Connection closed by invalid user yinsen 94.23.30.184 port 55154 [...
tai's user avatar
  • 121
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0 answers
849 views

Reverse Proxy (NGinx) with captcha

I am trying to prevent some brute force attacks on an web app by having a captcha before the login page. The application itself is not modifiable by me, so I cannot change the login form. I could put ...
schube's user avatar
  • 183
0 votes
2 answers
2k views

fail2ban log activity even if IP has been banned anyway

I would like to know if there is a way to know if a banned IP is still trying to contact my server and what is he trying to do? The fail2ban.log seems to show who has been banned, but not if a banned ...
dkdlv's user avatar
  • 3
0 votes
1 answer
183 views

Can a bots scanning my server change its source ip? Why do I keep getting attacks even after blocking the IP?

I have a PBX (VOIP server) where phones connect in order to make phone calls. The pbx I am using is Asterisk. That server is not being used and it's only purpose is to analyze attacks. The PBX service ...
Tono Nam's user avatar
  • 322
0 votes
1 answer
444 views

How can I stop this kind of exim attack?

I has been search here, BUT no topic about my question (they just ask for their email was rejcted, but this time, not my email was been reject), it seem someone try to send spam out via my server, ...
simonlo's user avatar
1 vote
2 answers
174 views

Can the bulk execution of "dig domain mx" on 5000 domains be considered an attack to the network?

I have a database containing a lot of invalid emails. I want to remove all the emails whose domain does not have mx record. So after I extracted the domain part I wrote a script to bulk check this for ...
Marinos An's user avatar
0 votes
0 answers
21 views

Outgoing Brute force attack from my Amazon EC2 [duplicate]

First of all, thank you for reading this. Today I receive an email from aws saying one of my fresh EC2 is being used for brute force attacks along with some details so I could fix the issue. ...
ashish's user avatar
  • 101
0 votes
1 answer
73 views

How to block rdp passwords brute-forcing? [closed]

I've noticed there are significant spikes in cpu consumption on my servers due to bots trying to brute force my rdp password. I tried to change an rdp port, it helps for a while but then it resumes. ...
SiberianGuy's user avatar
0 votes
1 answer
683 views

Disabled SSLv3 in Windows registry but still showing POODLE vulnerability

Windows server 2016 Standard. Recently we've been getting hit by brute force attempt using POODLE. I did a little research and found we should disable SSLv3. However, when I go into: ...
00fruX's user avatar
  • 123
3 votes
3 answers
15k views

SSHD: Difference between "connection closed..." and "disconnected from..." in log file

The sshd service on my Ubuntu server is under constant attack for various IP and user id. According to /var/log/auth.log file, there are three different types of fails from unknown id and IP address: ...
codechimp's user avatar
  • 133
0 votes
1 answer
4k views

Postfix blank sender from= <>

Recently I received spam report form my vps provider and Trend Micro, I think my vps got suspended because a or some unknow "blank sender" using my mail server as a "jump point", I ...
nightisovered's user avatar
0 votes
2 answers
394 views

Detect service which is trying to access MySQL database with root privileges

I have a server with MySQL database which is accessible by WordPress. In every 1-2 seconds I see the following in MySQL error.log [Note] Access denied for user 'root'@'localhost' There is no password ...
Aleksandar Andrijevic's user avatar
0 votes
1 answer
316 views

Server IP spoofed and attacking

I have a server that has been reported as an attacker since January, finally today I found some information about these attacks, however none of the logs on my server shows anything similar. As a ...
spacebiker's user avatar
0 votes
1 answer
198 views

How do I prevent unwanted FTP connection attempts on my Windows Server 2012 R2?

It appears that I'm getting FTP connection attempts from unknown sources. The SYN_RECEIVED state is nearly always showing. netstat output C:\Users\Administrator>netstat -aon | findstr &...
bezbiker's user avatar
0 votes
1 answer
139 views

Network Threat Protection

Today, my Database server unexpectedly restarted. After checking it, I found that since the start of December, I was getting this event, Network Threat Protection Event. Here's the event Object ...
adel sameer's user avatar
0 votes
0 answers
180 views

Is there any tool to autoreport brute force attacks?

I'm annoyed by brute force attacks, not because they harm me, my server is pretty secure and no relevant data on it, but because they get away with it and might get someone else. If I do whois idiot....
Maritn Ge's user avatar
  • 101
0 votes
1 answer
88 views

How to stop my server from bruteforcing another [duplicate]

There are so many resources on how to stop bruteforce attacks on your server, but I can't find any good on bruteforce attacks FROM a shared hosting server. I am getting a lot of reports from many ...
JoeRoot's user avatar
  • 101
0 votes
0 answers
163 views

Azure container instance receives tremendous traffic even right after its creation

I've created an Azure container instance with MSSQL container image. It starts. However before even login, or even putting the URL in to use, I've checked the container logs and it's being hit with ...
inckka's user avatar
  • 201
0 votes
2 answers
252 views

Strange behavior in Apache log

I have a Nextcloud server running on Apache, and disabled my firewall for about 5 minutes while I ran an apt-update. I decided to check the logs after, and found this from an unknown IP. It looks like ...
user3207650's user avatar
-1 votes
1 answer
110 views

After cyberattack, a new Administrator account has popped up, what, how and for what? [duplicate]

After what seems a human-directed ransomware attack, I am analyzing the system. It is a Windows Server 2016 and I had created the usual Administrator account. Now I see that during the attack, a new "...
kankamuso's user avatar
  • 487
2 votes
1 answer
2k views

Block bruteforce attempts with nginx & cloudflare without rate limiting

So I discovered servers trying to bruteforce my API so I want to block them...but my specific scenario made it difficult to work with common solutions found on the internet. 1) I don't want to just ...
Freedo's user avatar
  • 143
-1 votes
2 answers
201 views

uninstall / deactivate ssh client only on linux server [closed]

How can I uninstall or completely deactivate ssh client only. I still need server to log in. I just wonna pretend ssh brute force attacks commming out from my server. Thanks in advance.
masterdany88's user avatar
-2 votes
1 answer
245 views

continuous attack on server nginx

nginx access log There is a continuous attack on server and i am not sure from where it happening. if someone can understand and guide me on this.
Manav's user avatar
  • 101
0 votes
1 answer
457 views

Handling ssh brute force attacks from ::1?

I have an Ubuntu server; first I ran into this, as I couldn't log in via ssh at all: ssh connection takes forever to initiate, stuck at "pledge: network" After a hard reboot, I could log ...
sdaau's user avatar
  • 101
0 votes
1 answer
360 views

SSH Brute Force Login Attempts - enable automated email to abuse-mailbox

Running some servers I noticed increased SSH Brute Force Login Attempts over the years. fail2ban is a great tool which massively slows them down and can email the abuse-mailbox/OrgAbuseEmail of the ...
Rainer Rillke's user avatar
0 votes
3 answers
189 views

Sharing IP black lists

Are there any tools similar to fail2ban that would allow sharing of IP black lists? What I'm looking for is something similar to a DNS based blackhole list or real-time blackhole list as is used to ...
Toddinpal's user avatar
  • 101
1 vote
1 answer
2k views

MySQL shutting down on ~ same time and is not starting. Brute Force Attack? Or what?

my portal started to shutting down (1 time a day) and it happening over a week now and i do not know were could issue be. .. MySQL is shutting down on about the same time and is not starting after ...
Ingus's user avatar
  • 59
5 votes
2 answers
2k views

Nginx: Rate limit failed basic auth attempts

Given a simple HTTP Basic Auth setup in Nginx (1.14.1 at time of writing) like this: server { ... location / { auth basic "HTTP Auth Required"; auth basic user file "/path/to/htpasswd"; ...
JinnKo's user avatar
  • 421
7 votes
1 answer
530 views

Windows RDP: Attack targeting real account names

We have a Windows 2012 R2 server hosted in a datacenter, and we are using RDP for its administration. Automatic updates are enabled. RDP login is not allowed for the Administrator account, and there ...
Olivier Leneveu's user avatar
1 vote
2 answers
2k views

Brute Force attack in DirectAdmin

I have problem with brute force monitor in direct admin. Every minute i get info like this: 15705610210001 52.187.17.107 123 1 sshd4 Oct 8 20:56:24 server sshd[10817]: Failed password for ...
jedlu91's user avatar
  • 11
0 votes
2 answers
1k views

Is it wise to have fail2ban block 301 brute forces when you have http to https redirection enabled?

Recently my servers started getting bombarded by anonymous scanners/brute forces. This is how my nginx access.log looked like after the attacks : xxx.xxx.xxx.xxx - - [07/Sep/2019:23:30:16 +0200] "...
Hassan's user avatar
  • 467
0 votes
2 answers
2k views

Stopping SSH brute force from China - fail2ban not working

I see things like this in my /var/log/auth.log sshd[2173]: Unable to negotiate with 218.92.0.205 port 21029: no matching host key type found. Their offer: ssh-rsa,ssh-dss [preauth] sshd[1964]: ...
Woodstock's user avatar
  • 113
2 votes
0 answers
5k views

How to protect against backdoor attack? [duplicate]

I've been getting strange page accesses showing up in my apache error log recently. It seems as though someone is trying to access /wp-login.php, /elrekt.php and other pages that don't exist. It's ...
Jordan's user avatar
  • 21
1 vote
0 answers
38 views

SSH brute-force from my network / domain [duplicate]

Twice a week I receive an email to [email protected] that says: An attempt to brute-force account passwords over SSH/FTP by a machine in your domain or in your network has been detected. Attached ...
Lorenzo Martini's user avatar
1 vote
0 answers
28 views

I am getting bruteforce attack from locvangxuanfb2019.com

In my wordpress website, I am getting bruteforce login attempts from locvangxuanfb2019.com and hopquavn2019.com When I try to ping locvangxuanfb2019.com and hopquavn2019.com I get response from ...
Future King's user avatar
0 votes
1 answer
3k views

IIS - Detecting Brute Force Logins and Password Spraying

TLDR; What techniques are being used to detect brute force logins and/or password spraying on IIS hosted websites (including SharePoint, OWA, etc.)? ModSecurity There are many tools for other ...
phbits's user avatar
  • 236
0 votes
1 answer
261 views

fail2ban filter matches no lines for xmlrpc attack

I'm trying to jail hosts that brute-force attack a web server, thereby creating (hundreds of) lines in /var/log/apache2/error.log of the form [Fri Feb 01 11:17:56.158739 2019] [:error] [pid 15870] [...
Camille Goudeseune's user avatar
1 vote
0 answers
192 views

How to Ban WordPress Brute Force Attack by Client From Apache's Server Status Page?

I have a server hosting multiple domains and protected by Fail2Ban with WP Fail2Ban and wordpress-hard + wordpress-soft rules. Recently I notice that our server is heavily loaded and seems like we ...
Kenaz Chan's user avatar
0 votes
1 answer
73 views

Blocking "pokes" of our system

We get tons of these in our apache error log every day. [Wed Oct 17 03:27:37 2018] [error] [client 103.41.124.159] File does not exist: /var/www/html/phpmyadmin [Wed Oct 17 03:27:37 2018] [error] [...
MB34's user avatar
  • 167
5 votes
4 answers
4k views

How to secure servers from a cgi-bin/php POST request attack

We got a POST request to our server with the following in it: %63%67%69%2D%62%69%6E/%70%68%70?%2D%64+%61%6C%6C%6F%77%5F%75%72%6C%5F%69%6E%63%6C%75%64%65%3D%6F%6E+%2D%64+%73%61%66%65%5F%6D%6F%64%65%3D%...
Dovid Bender's user avatar
0 votes
1 answer
91 views

Block outside TCP requests from centos server

I have a centOS server and user to host web systems with LAMP. Server owners are complaining that we are sending abnormal TCP requests to external server. How can we block these types of requests? Can ...
Sathiska's user avatar
  • 113
0 votes
1 answer
442 views

Suspicion of brute force attack on mysql

In these last couple of days, one my vps server has crashed twice for no appearant reasons. All sytems on it are up to date. Fail2ban is installed and jailed as much as usual, I trust the server's ...
Tritof's user avatar
  • 159
1 vote
1 answer
815 views

RDP Server under attack; IP address used is our server address

I have setup a Windows 2016 server for remote desktop access, and installed RDPGuard to block brute force attacks. This worked well for a few days and RDPGuard blocked out a number of IP addresses. ...
Laurence's user avatar
0 votes
1 answer
251 views

My web server is being hit, all resources are maxed out, how to find out the root cause?

Recently my websites appear to be getting hit by something. They slow down and become unresponsive. After I terminal connect to the server, I see that all resources are maxed out, 100% of CPU, Memory, ...
AmericanNinja's user avatar

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