Questions tagged [hacking]

Hacking is the violation of server or network security via exploitation of weaknesses in that security.

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54 views

My Node.JS program running on an internet-facing server is printing impossible text to the stdout log. Have I been compromised?

(EDIT: Turns out the "strange behavior" is explained by a simple oversight. Keeping this question here in case anyone else overlooks it) I hope I am asking this question right. I have a ...
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66 views

Is it possible to hack a server with a SSTP_DUPLEX_POST request?

How is it possible to use the method : SSTP_DUPLEX_POST and the url : /sra_{BA195980-CD49-458b-9E23-C84EE0ADCD75}/ to hack a server ? I have this request in my logs from a well known malicious IP ...
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35 views

Recommendation to fix the slow HTTP post vulnerability reported by Qualys on IIS

I am trying to solve a vulnerability in an IIS server (Reported by Qualys) in which we have a "Slow HTTP Post DDoS" risk and we already apply the following solution: Delimit the request ...
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1answer
25 views

How to restrict access between folders on the same virtual host

We plan to host WordPress Blog and an Ecommerce store on the same domain, so the URL's will look like this: example.com <--- Magento Store example.com/blog/ <--- WordPress Blog Our main concern ...
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34 views

.htaccess file hacked [duplicate]

How can we protect our htaccess file? This code has appeared there several times now: (inserted by hackers) RewriteBase / RewriteCond %{HTTP_USER_AGENT} (google|yahoo|msn|aol|bing) [OR] RewriteCond %{...
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31 views

Trojan:PHP/Obfuse.AR!MSR Detection by Windows Defender [duplicate]

I have an AWS server running Windows 2016 Datacenter. From the past few days, Windows Defender has been reporting Trojan:PHP/Obfuse.AR!MSR pointing to random phpXXXX.tmp files inside C:\Windows\Temp ...
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16 views

Anyone saw this Powered byNsfocus Collapsar before? [duplicate]

While visiting one of my Websites i saw this black screen in the Screenshot attached. It was just for some seconds. Anyone know what it is? is it a hack? Im running on Centos8, with Litespeed and ...
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33 views

How to stop malware with Synced folder

Let's assume that we have synced folder between 2 Co-Servers, a ransom is affect one of the servers that have synced folder and the files is encrypted. The encrypted files will synced and encrypt the ...
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2answers
117 views

Block all outgoing ssh traffic

My EC2 instance reported got suspicious activity and I got this email: has been implicated in activity which resembles scanning remote hosts on the internet for security vulnerabilities. Activity of ...
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2answers
35 views

TCP modification in-the-middle and acknowledge number

For some private purposes I need to enrich HTTP header with additional information (which will be handled by app on the HTTP server side). The basic idea was to modify received packet, send it to ...
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2answers
902 views

Email smtp credentials keep getting compromised every now and then (laravel 7)

Just as the title says, we have a website that uses third party smtp credentials to send emails, but, we keep getting our smtp credentials hacked and used to send spams emails, which results in our ...
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34 views

Are requests with no headers a sign of hacking?

I run a NodeJS web application with packages up to date and secured with a strong password and RSA for ssh. The application runs on two domains. I check the request headers to get the domain and found ...
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1answer
207 views

Hack attempt Windows Server 2019 [duplicate]

I have a Windows Server 2019 VPS for hosting websites. It has all the latest updates. But somehow there is a (partial) hacking attempt. I first noticed it by the SMS I got for high CPU usage of the ...
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1answer
141 views

Google redirect failing on symfony website

I am helping a friend with her website mainteinance and there is some strange behaviour that I do not fully understand. When you search for her site on google.com, and click on her main website, the ...
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Netcat listner is automatically terminating the session

I'm in a virtual environment set up by the school, in which I'm supposed to change a user to root. I have a program that runs each 5 minutes and added this code to the program. The code is provided ...
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15answers
22k views

Should I respond to an “ethical hacker” who's requesting a bounty?

I run a small internet based business from home and make a living at it to feed my family, but I'm still a one man show and internet security is far from my area of expertise. Yesterday I received two ...
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1answer
72 views

How and where do you report “bad” servers?

I recently setup an nginx that was open to the world in order to serve an API to global users. It's getting a lot of "prodding" (ie: weakness testing/hacking attempts) from an IP address ...
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17 views

Detecting Spyrix Keylogger in a system [duplicate]

Our UTM (Firewall) logs showed Spyrix(Key Logger) has been downloaded on a particular IP in our network. While, on that system, we couldn't see Spyrix. what are the ways to detect traces of syprix in ...
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1answer
42 views

Guess current date/time on remote server [closed]

I want to know the current date/time of a remote server. I do not have any access on this server. This server expose OpenSSH (port 22) and apache2 (port 80) Is there a fingerprint technique that can ...
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1answer
63 views

How to prevent Apache2 malware execute

Is there any way to prevent to execute some unwanted malware in Apache2. One of our clients Wordpress website is hacked and there was a files like /wp-content/uploads/2020/05/U27I0x Those files ...
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3answers
347 views

Unknown IP trying to sign in to my phpmyadmin

I am very worried. I have a little web server hosting a PhpMyAdmin page (in which they are some important databases). Yesterday, I posted a full new webpage on my server (but a very simple HTML and ...
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1answer
110 views

I see an additional SSHD connection established from an IP that I don't recognise. Should I be worried? (output included)

Here's the output (I've changed my IP to 23.23.23.23) [root@web01 centos]# lsof -i tcp:22 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 3705 root 3u IPv4 ...
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32 views

Server hacked and lots of randomly named .php files in the webspace directories [duplicate]

So apparently my Server kinda got hacked. I don't think that someone got access to the root user or any other user but in every main directory of the www-data user there were a lot of weird files. ...
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1answer
62 views

How do I know if an abuse report about unsolicited is actually about my server?

I received an Abuse-Message from the operators of dnsbl.de. To me it sounds like it has nothing to do with me, but since it is too serious I don't want to do "guess work" and check whether it really ...
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26 views

Is someone trying to hack into my server? [duplicate]

I don't do server stuffs on regular basis, I was just wondering how to check SSH login logs and found that it can be checked using sudo cat /var/log/auth.log and checked on my server and there were ...
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1answer
431 views

How's hacker used cgi script on Apache2 server to hack and delete database

Today one of my server has been hacked and hacker deleted my app database. And to restore back they are asking to pay money in BTC. Well, I started investigating to Apache2 logs and found many ...
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2answers
81 views

Server compromised or hacked

I don't understand how this subdomain appeared today: http://hainanbank.com.cn.croppio.com/. I have only added https://croppio.com/ without any sub-domains. I double checked the server configuration ...
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56 views

Finding unauthorized user changing files

I manage a client hosting account on [color]host platform. It is a VPS account, running CENTOS 6.10 kvm [server] v84.0.16 OS. There are PHP/MySQL sites, along with WordPress sites. All WordPress ...
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1answer
69 views

Why do I keep getting fake sign ups on my website?

I have a website and it is starting to get more users. To use the services offered by the site, a person has to sign up. The sign-up requires an email, password, and a five-number string for recapcha. ...
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1answer
219 views

How do I see the traffic of target device in WiFi Pineapple Portal?

I'm using Windows 10 PC connect via Ethernet cable. I also connect my WiFi pine apple nano into my PC, and configure : Ethernet sharing to share internet connection through : PineApple PineApple, ...
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1answer
91 views

Is it possible to use a DNS server as a proxy? [closed]

My mobile internet provider cuts my internet service at times before it was due, I contacted them and they did nothing about it I noticed I could still ping hostnames, thus I can connect to the dns ...
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1answer
648 views

Someone is sending email from my address. How can I prevent this from happening

I received a bunch of Mail delivery failed: returning message to sender messages and found out that someone is sending this email to random addresses: Today we are reaching out to people, brothers ...
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1answer
70 views

Was this a hacking attempt? (Docker container -> MariaDB)

since i am completely new to web hosting and setting up web servers, please excuse my dumb questions ;) Yesterday i uploaded my web application on digitalocean. The application is a very simple ...
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1answer
338 views

Server Abuse/Proxy Abuse — Automated Tunneling (Unique IP's = Hundreds, Thousands of Requests)

I run a simple Proxy/General-Use website me and a few friends use at kerenua.xyz, however, starting 3~ weeks ago, an enormous amount of traffic started flooding in from hundreds of (unique) IP ...
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2answers
1k 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]: ...
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2answers
384 views

How to combat/prevent repeated unauthorized attempts to login to my postfix server?

I recently setup my first postfix server and am loving life. :) But, today I logged into the server to debug some connectivity issues that ended up being on my end, and noticed in the mail log that ...
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0answers
18 views

Many requests over port 445 on Ubuntu VPS, what could it mean? [duplicate]

I own a small VPS hosted by Hetzner on which i run a small Minecraft game server. The VPS is running on Ubuntu, and the only software i installed are Java JRE and the required software to run a ...
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2answers
95 views

Many HTTP CONNECT request for not owned domains

I had a cloud server with two ip, and each ip is configured respectively with apache and wildfly server. In each of them there are some domain/vhost setup in production. Checking the apache access ...
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70 views

(404 Errors) Why are hackers looking for directories named “/najwutoanfga/” and other 10-12 char strings of random letters?

I was looking through the 404 errors of my nginx logs today to see what the hackers are trying to do on my website. I usued this command: cat access.log | grep '404' I saw the usual requests for ...
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0answers
120 views

Very slow server and straight entries in error.log

I am running ubuntu 16.04 and suddenly over the last 2 days my server is basically at a stand still, I have upgraded everything and cleaned my error.log. I rebooted the server and about about 5mins ...
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2answers
302 views

How are hackers getting into our server without brute-force? [duplicate]

I am a web developer and we have no one specialising in the wellbeing of the server or the network currently at our office. Usually I can sort many of the issues that arise with my basic knowledge but ...
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2answers
3k views

local mysql was hacked with ransomware hack. How to check if database data was downloaded?

I had a test mysql database running on Vagrant dev box. Turns out the network wasn't that secure. All of the databases were deleted (and replaced with a DB ransomware note) and in the logs I can see ...
0
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1answer
289 views

Post request with host = "><script>alert('qualys_xss_joomla_2.5.3')</script>

On my web server Yesterday I have caught a POST request with following text for a host "><script>alert('qualys_xss_joomla_2.5.3')</script> in full it was like this headers { ... ...
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1answer
917 views

Suspicious ssh log entries (“Accepted none for anonymous”)

I got this log entry chain (and similar repeatedly) on my server: Nov 24 07:38:59 server sshd[28676]: SSH: Server;Ltype: Version;Remote: 54.38.81.12-40482;Protocol: 2.0;Client: OpenSSH_7.2p2 Ubuntu-...
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1answer
270 views

Vulnerability risk in modern vlans

I'm looking at using VLAN to separate some traffic without buying a bunch of switches for two or three devices. The plan is to use untagged ports for dedicated lans with an external router connecting ...
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1answer
644 views

Catch backslashes, single and double quotes in GET requests

According to this SQL Injection Basics article: <…> the operations mostly used for breaking\fuzzing the SQL query’s are. ' Single quote " Double Quote \ Backslash (MySQL Escape ...
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3answers
5k views

Someone just trying to hack me? login.cgi+wget

I'm build a new server on Apache, actually I am learning, so I'm trying different things. My security system is already done, but of course I may miss something, or, if not, I do understand that today ...
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87 views

how to find the source of mail (host<->lxc container)

One of my lxc-containers is mail server. the others and the host use it to communicate with the world. But something is using my mail server to sending mails. I found, that mail server receives it ...
0
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1answer
662 views

How can a hacker compromising the www-data user account install a rootkit?

Recently a site of mine was hacked. For sure the attacker can execute PHP and start an interactive shell, etc. I understand a hacker can delete files, or delete DB, the site folder, write in the cron ...
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1answer
1k views

Apache 2.4 log PHP command 200 success, but what is it doing? POST /?q=die('z!a'.'x'); etc

I am running a CentOS 7.x VPS with Apache 2.4.29 and PHP 7.0.28 and I started seeing the following in my logs. I have php.ini secured as best as I can from articles online for a while now, but I am ...

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