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Questions tagged [hacking]

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

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Created New MSSQL Instance, Can't Execute Commands

I created a new MSSQL instance following the steps from this video. My purpose is to teach my students how to attack an MSSQL instance from a Linux machine, however I cannot execute a single command ...
sunflower's user avatar
0 votes
0 answers
19 views

How to fixed hacked wordpress site [duplicate]

So I have a wordpress site (sevenavedesign.com) and currently I'm having an issue where when visiting the site sometimes it redirects to a spamvertising site. This does not always happens and it ...
Sevenavedesign's user avatar
1 vote
0 answers
43 views

weird /ws/info requests on our server: is our client compromised?

We have a big website on a virtual server that runs fine. We have a few hundred clients. Since a few weeks, we saw that with exactly ONE of these clients there were 404 references to hrefs like www....
Roemer's user avatar
  • 111
1 vote
0 answers
24 views

btmp is showing me a login duration over an hour. How can a failed login last that long?

I was watching a server console for results of my own activity and was bombarded by someone trying to do GET on a long alphabetical list of files/directories. I checked lastb and found some entries ...
Sinc's user avatar
  • 111
0 votes
0 answers
24 views

Running Linux commands execute hidden command to regenerate Backdoor [duplicate]

My CentOS server compromised, the backdoor uploaded in /var/www/html/, I have deleted the backdoor and browsed the backdoor - to be sure it's deleted - it's surly deleted, but when I run any command ...
Dany Burgos's user avatar
-1 votes
1 answer
58 views

Can already opened event log screens of powershell on windows event viewer can be hacked offline by hackers? [closed]

Can Windows powershell give me fake or altered outputs if I use common commands primarily used in powershell checking hash codes is option but they can be altered too theorically so its not that ...
Mande de su ka 's user avatar
1 vote
0 answers
89 views

Server hacked? Binary /usr/lib/os-release!

Server: Ubuntu 20.04.5 LTS I was going to generate an SSL certificate as usual with certbot but suddenly it started to give a weird error: An unexpected error occurred: UnicodeDecodeError: 'utf-8' ...
Darko Romanov's user avatar
0 votes
0 answers
29 views

Someone installed a cryptominer on my Ubuntu server [duplicate]

It seems someone gained access to my ubuntu server and installed a cryptominer. This user added a crontab for the user "git" on my server. I disconnected the server from the internet and I ...
Davidoffo's user avatar
0 votes
1 answer
82 views

How to block all requests starting with "?mode" on Apache?

Recently my website was hacked and now I have around 20000 indexed links in Google that were redirected to other sites via my website. Now I have stopped all redirects but I have too many request on ...
Ahmad Eidizadeh's user avatar
0 votes
0 answers
35 views

Limiting the number of url address characters on the site and blocking it

hackers are slowing down my server They send repeated requests with different IPs They are constantly sending long url addresses like below: mysite.com/asm-nfm555sd5-nfm.mp3asm-dnfm555sd5-nfm....
sanja's user avatar
  • 1
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0 answers
173 views

How to prevent compromising the email server if user credentials leaked?

I've been using AWS SES as an SMTP relay (Postfix + Dovecot) for years and now am facing the pausing of sending emails for the second time. We use this combination as an email server for business ...
Ljubisa Livac's user avatar
-6 votes
1 answer
95 views

Is there any way to access Hyper-V host from a network adapter not shared with host? [closed]

I am considering to move my firewall inside Hyper-V. There will be only one Guest OS that is connected to the virtual Switch, and the guest OS is the Firewall OS. While the second adapter at the ...
prd's user avatar
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-3 votes
2 answers
1k views

Network is gone when I start arp spoofing [closed]

So for context I have two virtual machines one is running on kali linux which is the "Hacker's" machine and the other one is running on windows 10 pro which is supposed to be the victim's ...
LuckyCoder3607's user avatar
0 votes
1 answer
366 views

VirtualBox network settings for multiple isolated virtual machines where only one can access internet

So I want to make a virtual hacking lab using VirtualBox. There will be two type of machines. Attack Machine : Kali Linux Target Machine : This can be any type of OS; Ubuntu, CentOS etc. I want my ...
testyAndro's user avatar
3 votes
1 answer
719 views

Since S3 charges by request, couldn't a malicious hacker cause a huge AWS bill just by spamming requests?

What would stop them from doing so, against, say, a static website hosted using S3? Is there a good way to deny some requests such that one avoids getting billed for them? (Context: I want to host a ...
Asker's user avatar
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0 votes
1 answer
1k views

What are all these requests?

I was checking my server's web server log where I'm installing a wordpress website, and found all these requests, the site is new! Should I be worried? Is my site hacked or something? I don't ...
user3279936's user avatar
0 votes
0 answers
20 views

Hacked website and cannot delete hacked file [duplicate]

First of all, I might be on the total wrong place to post this, but my researches lead to here and I've found "similar" questions being asked here. But still since I lack knowledge in this ...
JVol's user avatar
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1 vote
1 answer
253 views

Are security updates applied with `dnf update` or is it separate procedure in Linux?

I found this vulnerability with polkit. It was found in Jan 22. How does keeping Linux updated security wise works in general? If I run dnf update on CentOS9 - will it fix it? Or shall I look into ...
Boppity Bop's user avatar
0 votes
2 answers
71 views

How to track specific logs in Ubuntu? (CPU)

We have this EC2 instance: T2.medium, running apache, with 4 virtual hosts (4 sites). Sometimes, out of nowhere, the CPU reaches very high levels, maybe an attack. I've seen some of our wordpress ...
0diseuz's user avatar
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
0 answers
256 views

Introduction problems with some server log file

I have that problem, that my server is flooded with some kind of requests as you see it here: 26/Jan/2022 66.240.205.34 "Gh0st\xad" "-" 26/Jan/2022 139.162.145.250 "GET 400 26/...
user2's user avatar
  • 1
0 votes
1 answer
808 views

Hacked file regenerates whenever it is deleted - ubuntu/apache2 [duplicate]

Have just had a hacked website flagged by Sucuri There were a number of backdoor PHP files flagged, which I HAVE been able to delete However, the index.php file has a spam link injected in to the ...
freestate's user avatar
  • 109
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0 answers
49 views

What is this hacker trying to achieve? [duplicate]

I have hundreds of lines like this in my syslog from many different ip addresses: Oct 16 17:03:06 example named[857]: client @0x7fa2dc083e40 104.190.220.183#3075 (sl): query (cache) 'sl/ANY/IN' denied ...
kauhikoa's user avatar
3 votes
1 answer
444 views

Malicious requests from private network (Kubernetes)

Recently I'm having many malicious requests to my nginx-ingress pod but I don't understand how's possible they're from a private network. Some examples: 10.114.0.3 - - [11/Oct/2021:09:07:09 +0000] &...
Darko Romanov's user avatar
0 votes
0 answers
30 views

Who has done what during the course of visiting wordpress site?

I run a small wordpress site. I use Korean. Today my statistics shows like the below. My blog has no more than 100 posts so I am suspicious about the 100+ hits from the same ip. Can this be an ...
KH Kim's user avatar
  • 113
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
2 votes
1 answer
1k 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 ...
majneeds2chill's user avatar
1 vote
0 answers
5k 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 ...
Frédérique's user avatar
0 votes
2 answers
178 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 ...
Kelvin's user avatar
  • 173
0 votes
0 answers
45 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 %{...
Daniel's user avatar
  • 1
0 votes
0 answers
34 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 ...
Prashant Agarwal's user avatar
0 votes
2 answers
746 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 ...
Muhammad Dyas Yaskur's user avatar
0 votes
2 answers
590 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 ...
Volodymyr Litovka's user avatar
5 votes
2 answers
3k 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 ...
logax's user avatar
  • 139
0 votes
0 answers
178 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 ...
emonigma's user avatar
  • 269
-1 votes
1 answer
614 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 ...
Pluisje25's user avatar
  • 101
0 votes
1 answer
336 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 ...
jmrueda's user avatar
  • 101
73 votes
15 answers
54k 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 ...
Vincent's user avatar
  • 818
0 votes
1 answer
297 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 ...
ndtreviv's user avatar
  • 113
1 vote
1 answer
335 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 ...
Bob5421's user avatar
  • 429
0 votes
1 answer
289 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 ...
Almas Dusal's user avatar
0 votes
3 answers
2k 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 ...
cl.ement05's user avatar
0 votes
1 answer
329 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 ...
vin's user avatar
  • 101
0 votes
0 answers
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. ...
Flo's user avatar
  • 113
2 votes
1 answer
104 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 ...
yankee's user avatar
  • 177
0 votes
0 answers
28 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 ...
John's user avatar
  • 1
0 votes
1 answer
753 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 ...
Vin.AI's user avatar
  • 103
0 votes
2 answers
98 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 ...
croppio.com's user avatar
0 votes
0 answers
68 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 ...
Rick Hellewell's user avatar
0 votes
1 answer
86 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. ...
curious1's user avatar
  • 113

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