Malware is any software application which subverts the will of the legitimate owner of a computer, by means of force or subterfuge, with or without personal or monetary gain on the part of the creator.

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18 views

clamscan using maldet Error: Servname not supported for ai_socktype

So i have installed Linux Malware Detect (maldet) to scan a server and everything went fine with installation but when i run it i get an error. Bunch of errors and than the scan just closes it. Here ...
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0answers
24 views

How do I discover a device that has made an interface promiscuous? [closed]

How can detect the device in my network that has made it's interface promiscous.
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0answers
33 views

How to find and remove this Ubuntu virus? [duplicate]

I have not posted before, but could really use some help. Apparently, I have a virus on my Ubuntu 12.04 server. It is an 8 CPU machine with 32 GB of RAM. The virus only uses one CPU, but uses 100% ...
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1answer
45 views

SED multiline recursive find and replace [duplicate]

I have a large number of sites with the same bit of php inserted in all files that contain footer in their filenames. //###==### malicious code //###==### How to use SED or another command to ...
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0answers
26 views

Receiving empty mails from three different Windows PC's since 12th January 2015

Since 12th Jan 2015 I am getting strange empty mails to my inbox every day. I was not able to trace their source. Fact I've noticed so far: they are all from company where I do network/sys support ...
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0answers
22 views

Server making outbound dns requests [duplicate]

I have a cloud server with Rackspace and they have blocked DNS because of "excessive queries". I can find the info below when running ps, but I can not seem to locate where the file is that is making ...
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1answer
77 views

How to remove crypto-ransomware on my network domain

Today some computer on my domain got infected with crypto-ransomware and have infected some folders on file server that only some computers on network have access to. So I presume one or more of five ...
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0answers
24 views

Suspicious process running in background in Fedora [duplicate]

There is a suspicious process which every time I boot Fedora starts and eats a percentage of CPU (10%~30%) and I think its name seriously denotes that it is malware! However, the name keeps changing ...
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2answers
36 views

Why is this server generating outbound IRC connections? [duplicate]

I noticed last night whilst checking our active sessions list on our firewall for something else, that a server was generating outbound IRC connections. Last night there was around 60 connections but ...
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2answers
169 views

My servers are overloaded with random GET requests. Why? [duplicate]

I'm getting a huge amount of traffic to web servers looking for bittorrent type queries: 110.152.78.14 - - [27/Jan/2015:01:45:22 +0000] "GET ...
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0answers
15 views

Virus sends mails via sendmail [duplicate]

I noticed that my server has some bad software that sends mails via sendmail which couses a very slow working. I scaned server with clamscan but without effect. Is there any way to find out which ...
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0answers
58 views

Automatic installation of DbSecurityspt folder

We have an Amazon EC2 instance. The folder DbSecurityspt gets automatically installed in c:/ProgramFiles and the associated service also starts automatically. Removing them, installs them again the ...
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0answers
25 views

Suspicious process self with random name in Fedora 20 [duplicate]

When I run top I see a two processes run by root with all random letters(jycybezyxa and jycybezyxa): >Tasks: 246 total, 2 running, 236 sleeping, 0 stopped, 8 zombie >%Cpu(s): 15.3 us, ...
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1answer
94 views

Server is trying to send out spam [duplicate]

My email server is attempting to send out a great deal of spam. I'm using Postfix & Dovecot. I'm trying to diagnose the problem and figure out how this is being sent. My guess right now is that ...
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1answer
66 views

Backdoor:PHP/Shell.P keeps regenerating.Caught by Antivirus. [duplicate]

I have a windows server 2008 with PHP on it and a few Wordpress sites on it. I got a virus some time ago. I thought I had it deleted and everything was fine but after looking at my Quarantine section ...
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4answers
158 views

Blocking Invalid HTTP Requests to PHP Application

For the first time in a number of years, I'm semi-responsible for helping out with the server administration of a PHP web application (served out using Apache). We're seeing a number of requests for ...
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1answer
83 views

Apache2 Mod_spamhaus Whitelist

We are using Apache2 mod_spamhaus and many customers were banned using the "Post" method. There is no way to deny mod_spamhaus ban continuously our customers making false positive or ban customers ...
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2answers
199 views

High number connections coming from an IP

On our corporate network we're detecting workstations opening too many connections to the IP address 75.126.196.159 (port 3478) causing the Cisco ASA Firewall 5550 to detect a "SYN Attack" and reach ...
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1answer
57 views

How to check if any malevolent scripts are running on the server? [closed]

I want to give some small jobs to freelancers who would have FTP access to my websites hosted on my server. I heard that sometimes it's possible they put malevolent scripts and software on the ...
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2answers
1k views

High CPU load on Centos with process sync_supers

My centos server has high cpu load right now. Please see the Htop output below. sync_supers is very suspected but I don't know how to kill it. Any suggestions?
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2answers
52 views

Best way to trace outgoing requests from a server

We have an Ubuntu 14.04.1 LTS server with nginx 1.4.6 that hosts a few dozen websites and received an abuse complaint from another server of hundreds of requests like this: "POST /wp-login.php ...
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1answer
120 views

Monitoring “external” worm activity remotely

Some of our computers in our company has been infected with the worm Conficker. We don't know the source of the infection, but I want to monitoring the outside activity to see if we are still infected ...
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2answers
116 views

Server compromised, how deep is the intrusion when PHP files are changed in folder without write permissions [duplicate]

I know there have been a lot of similar questions, but none of them covered this specific question: I found on almost all PHP files on a clients server script injections, it was actually the script ...
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1answer
457 views

Getting rid of Trojan on Debian Server [duplicate]

-------- EDIT --------- I do not agree that this is a duplicate of the linked question. I know that the correct way to deal with this is to wipe and reinstall the server. However, i am interested in ...
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1answer
195 views

My website redirects to malware link [duplicate]

I coded my own website and uploaded to a host. Some days ago I realized that in front page suddenly redirects to an unknown websites, until 3-4 redirects. The redirects ends up at: ...
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1answer
80 views

How to add wildcards to Linux Malware Detect ignore_paths

I am using Linux Malware Detect to scan and report on malware, but on a daily basis I receive alerts for malware in users emails (mainly spam folder). I do not want alerts for this, the spam folders ...
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1answer
146 views

sed comand - remove virus from wordpress [duplicate]

I have malicious code in every php file. This malicius code is auto paste at the beginning of file. I want to remove this with UNIX command from console. This is malicious code: <?php ...
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0answers
120 views

rkhunter reports suspicious activity /bin/usr/wget and killall permissions changed

Sorry about the long post but please bear with me. I'm wondering if my system has been compromised. I've had issues in the past on this VM server with a Linux.BackDoor.Gates.5 Trojan that was DDoSing ...
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2answers
72 views

Unknown issue taking down client machines, virus or coincidence

I’m sorry if this should be on SuperUser instead of ServerFault. Please ask me to migrate the question instead of flaming. I’ve had 2 windows desktops go down on the network in the space of one ...
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0answers
45 views

Maldetect Ignore List Not Being Honoured

I'm using Maldetect on CentOS to scan for malware on my server. I have hundreds of thousands of audio files on my server which I do not want scanned. According to the README: ...
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1answer
42 views

How do I find what PHP script is changing the file

I have apache installed with mod_php PHP5. I've been able to find out that apache process is changing my .htaccess and index.php files in /var/www directory. All files in this directory are owned by ...
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1answer
61 views

Host says server is affected by malware, anyone knows this one ? What to do? [duplicate]

My host sent a notification that says server is infected with a malware, it doesn't seem very popular. The Symantec site about this malware shows windows machines as targets, but not CentOS. Anyone ...
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2answers
139 views

Is this slowloris attack or not?

IP is hidden in apache log for privacy, except last octet. /billing is our application start page. But it doesn't make sense that it sends POST requests, and get 500 response. Or maybe this is ...
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0answers
299 views

Slowloris on Apache: is mod_reqtimeout + mod_qos enough?

I detected few days ago that my server was under slowloris attack (I found a lot of "-" 408 0 "-" "-" values in my access.log). I changed my configuration like this: In mod_reqtimeout: ...
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1answer
90 views

malware infected server respawing of files [duplicate]

So I have a clients server that is infected with malware. Basically any index.php file on the server was infected as well as header.php, function.php. The infection seems to be primarily wordpress ...
0
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1answer
115 views

What are best practices for defense against CryptoLocker type threats in an Active Directory environment?

What are best practices for defense against CryptoLocker type threats in an Active Directory environment? Are there Group Policies that could help? NTFS permissions? Anti-virus software?
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1answer
55 views

How to view traffic operating on a specific port without plugging into egress interface? (Cisco IOS)

I'm trying to track down what host is infected with ZeroAccess on my network. It runs on ports 16464-16471. I would like to find this host without having to connect my laptop to the egress (WAN) ...
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0answers
145 views

Is Jetty immune to Slow HTTP Denial of Service attacks (e.g., slowloris)?

After a security scan, our webserver was found to be vulnerable to "slow HTTP denial of service" attacks. We are currently on an older version of Jetty (6.1.22). I'm not sure if the scan actually ...
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votes
1answer
48 views

Random port in Filtered state for brief amount of time found using nmap , possible trojan?

Nmap results show me port 3527 open for brief period of time and then it disappears. I have a feeling this could be trojan communicating with mothership. Or something normal, but I cannot find much ...
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2answers
668 views

How do I remove 1 line of code from PHP files containing a specific string? [duplicate]

By coincidence I noticed that quite some of the PHP files of the sites I host have had malware injected: They all have the following line before the original/correct code: <?php ...
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votes
2answers
138 views

Conficker Virus Infection: Where did it start? [closed]

I have a network-wide Conficker infestation, and we have been working on starting virus scans on all our servers and workstations. It is being erased one by one, but I was wondering if there is a ...
2
votes
1answer
200 views

WMI query of DNS shows a root hint that's not present in the DNS plugin.

I was writing a Powershell script for my network when I came across some alarming information in our DNS. Bear in mind we still use Powershell v2, not v3. So I have to query DNS via the Get-WMI ...
10
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7answers
2k views

What are the pros/cons of blocking a program from running in %appdata%, %temp%, etc.?

While researching ways to prevent CryptoLocker, I saw a forum post that advised using Group Policy Objects (GPO) and/or antivirus software to block run access in the following locations: %appdata% ...
3
votes
1answer
244 views

Does anyone recognize this e-mail sniffer or malware using ROT13 encoding?

I have a private website that every week sends e-mails with two different http links to a group of around 30 people. When a link is clicked, the answer is registered in a database. Starting last week, ...
4
votes
1answer
198 views

Server side antivirus or not?

We have basic server-side virus scanning in our datacenter, but it's expensive, uses a considerable amount of CPU cycles, and is annoying to maintain. I'm not looking for a sales-pitch on "better" AV ...
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0answers
268 views

Suspicious “sys0972500-1.php”, I didn't put it on my server

Before 2 days I found inside the httpdocc a new folder which name was css. Inside this folder I found a file named sys0972500-1.php , which it caused send thousands spam emails from my server. I ...
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1answer
989 views

group policy exception to disallowed

I'm trying to setup a group policy on a domain to block cryptolocker (among others). I'm mostly following the Cryptolocker Prevention Kit ...
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1answer
87 views

Strange ports on default install of W7

I have a base new install of windows 7, and when I went to look for something else I saw the attached netstat output. What concerns me is that this is Windows + Truecrypt + drivers, nothing else ...
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1answer
82 views

Small business server 2011 standard - applications randomly closing for remote desktop users

Small business server 2011 standard - applications randomly closing for remote desktop users I have an issue where when you are connected through remote desktop (doesn't matter whether you have ...
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1answer
341 views

False positive rate of CBL

We've come into the office (30+ networked systems) this morning to find that our email server is blacklisted on the CBL for: This IP address is infected with, or is NATting for a machine infected ...