Spam is the use of electronic messaging systems (including most broadcast media, digital delivery systems) to send unsolicited bulk messages indiscriminately.

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58 views

Unique human view count system without captcha on Pay Per click system, using cryptographic proof of work

I have a system that will be paying users per unique view on a page. I need to prevent 80% of fraudulent automated traffic from being counted. I need to avoid captcha.I would like to implement a ...
8
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3answers
721 views

How to protect contact forms against being misused for mass-mailing?

A common function of contact forms is to send the contact message not only to the site owner but also to the person who sent the contact request. What are good measures to protect against the form ...
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2answers
381 views

Where can I get a list of “bad” IP addresses that are likely to be used by attackers or spammers? [closed]

Is there an open source project or a list of "bad" IP addresses or ranges that are likely to be used by attackers or spammers? UPDATE: ideally I want it to be a service call so I can call it using ...
2
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3answers
48 views

Is there any benefit to spammers oversaturating a service?

If I understand correctly, spam is most effective when it looks like real content and entices a user to do whatever the spam is asking it to (for example, clicking on a link.) Naturally, keeping a low ...
8
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1answer
140 views

Got a spam mail with an htm attachment, is the script harmful?

Today I got an email with an htm attachment, the mth contains the below code: <html> <head> <script> var url = "" window.location.href= url; ...
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1answer
112 views

“Secure” emails from unfamiliar source(s)

The context is long, so I'll ask my question first. If an encrypted message is received from an unfamiliar sender and it's spam, how can I avoid receiving further messages of the same sort? If it's ...
54
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11answers
11k views

Why would a spammer try to get a (normal) image of mine?

Yesterday I found a spam mail in my inbox. I inspected it in order to find out why DSpam and SpamAssasin failed. You can find the raw German mail here, here's a translation: Good Morning. We got ...
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2answers
170 views

Is this spam SMS containing an audio file dangerous?

Yesterday I received a group text message from a number I don't know and opened it by mistake. I was in a group chat with two other people, one in Pennsylvania one in Massachusetts. The message body ...
2
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2answers
79 views

Does ISO 27001 allow cloud based Spam/Malware filter solutions

We are currently switching over to Exchange 2013 and we are thinking about outsourcing the spam and malware filtering to Microsofts Exchange Online Protection. Its implemented by changing the MX ...
4
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3answers
4k views

I'm getting spam e-mail…from myself?

I noticed yesterday that I had received spam e-mail, but my own e-mail address was listed as the sender. Naturally, I changed my password. This is probably a spoof, but I don't know enough about ...
2
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1answer
49 views

Can spambots access pages available to only registered, authenticated users?

I have a web application where users register and are activated via an email sent to the email address they supplied. Then there are pages that are only visible to registered users (non-user access ...
3
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1answer
43 views

A single site for reporting unknown virii

I have just received an email with an unknown virus. I happily passed through my scanners. I have checked it's still unknown to all of 4 anti-viruses I have an access to. I have already reported it ...
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1answer
84 views

Server is Sending Spam

I have determined that my server is compromised because it is sending spam (from one of my legitimate addresses). How can I determine what's compromised? Does the attacker know my SSH password? ...
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1answer
255 views

Correct way of dealing with spam via impersonation

I've been having a recurring problem at work: My boss's contacts keep receiving emails with links sent by a fake adress. The adress always has my boss's name + a different domain name every time. ...
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votes
1answer
195 views

What is the purpose of viagra spam? [closed]

We all have gotten them: The reflection of your size will stay forever in her eyes. Bigger pen!s gives you a bunch of benefits! I have girls that ring me for sex now, its amazing! Judging by ...
0
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1answer
50 views

Changing senders, same spam messages

We have a situation at work regarding to our mail filtering appliance and I was hoping that you could give us some insight on how to approach this issue. We've been receiving spam emails with the ...
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2answers
247 views

Reaction to spam from acquaintance

It often happens that I receive an email like this: From: acquaintance@herbal-viagra.com To: me@domain.com Hi, me@domain.com -- Check this out: http://herbal-viagra.com -- ...
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1answer
67 views

Does a 'mailto:' hyperlink spoil any preceding email obfuscation efforts in PDF?

Assume there is a PDF file which contains the example@example.com email address as an image (the classic obfuscation method). However, what if this image is made clickable with a hyperlink which ...
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2answers
104 views

How to prevent phishing mails from being successful? [duplicate]

I'd like to know what the best methods are to prevent success of phising mails. This question contains the following subquestions: What are the best ways to determine incoming phising mails (on a ...
6
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1answer
2k views

How to reject e-mails spoofing your own domain targeting your employees at Office365?

One problem Office365 users deal with is that an external SMTP server can spoof the domain of an organization and send e-mails to the domain users; where the e-mails appear to be from employees of the ...
1
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0answers
130 views

How to know which extension or software is causing ads in Chrome? [closed]

Starting yesterday, I noticed that something weird is going on with my laptop. After unlocking my laptop I found that the empty Chrome pages that I opened are getting redirected to ads. I am running ...
2
votes
1answer
93 views

Why are packets constantly being sent to international ISPs?

When using a packet sniffer, I notice a lot of packets being sent to a bunch of ISPs (such as axion.ca, wanadoo.fr/orange?, bresnan.net, zebra.lt) usually all at the same time. Here's a screenshot of ...
3
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2answers
223 views

Is it appropriate to block a sender's email address

This morning I received a mail from Apple suspension UK <do_not_reply@apple.co.uk> with the subject Apple "Unauthorised transaction alert". The mail was sent to one of my company's distribution ...
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1answer
149 views

What are the point of these gibberish comments?

On this site there are comments such as: ÃÊÁ ¹67 Èìåíè Âîðîõîáîâà â Ìîñêâå (Ãîðîäñêîé äåïàðòàìåíò çäðàâîîõðàíåíèÿ) ïî ïðàâó íà -ñåãîäíÿøíèé äåíü ñ÷èòàåòñÿ êðóïíåéøèì âðà÷åáíûì çàâåäåíèåì ãîðîäà ...
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2answers
10k views

What is the purpose of these weird non-spam emails?

A mail made it through the spam filter and i wonder what the purpose is. It is not spam. Tracking? But how? Who? and why? In the source code there are this weird passages like ... =EA=85=9F =EA=8F=...
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2answers
8k views

Yahoo mail hacked - how to recover, how did it happen and how to prevent?

I was yesterday informed by some friends that they received spam mails with my name as sender. The sender addresses look like firstnamelastname@spacepc.pt and firstnamelastname@revistaplot.com with ...
2
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0answers
40 views

How should end users respond to Earthlink's “Allowed Sender” feature when blocked by policy?

Some of our users are requested to click on an Earthlink antispam URL below https://webmail.pas.earthlink.net/wam/addme?a=USERNAME@earthlink.net&id=<SOME GUID> However our firewall ...
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2answers
143 views

How to deal with SMS spam? [closed]

Every few weeks, I get an annoying SMS trying to sell me something, or trying to get me to click something, or otherwise spamming me. I don't think it's a targeted thing- I think my phone number is ...
3
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3answers
155 views

Email injection in simple terms?

Can someone explain why spammers use email injection? I am a victim and was wondering if there was any other malicious point besides annoying me and filling up my e-mail?
2
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1answer
57 views

Website Spam Bots In Google Analytics

I had a website URL which was getting around 60 hits a day from typical spam suspects like buttons-for-websites & ***.semalt, etc, etc. So I decided that when I changed my hosting account I would ...
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0answers
153 views

Why is my website getting spammed?

Does anyone recognize this type of spam? NAME: Bagas EMAIL: dq95zxm7l@gmail.com PHONE: JCBUIR6ulwtO COMMENTS: I must express apaotcipeirn to the writer for bailing me out of this particular ...
72
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8answers
9k views

Unsubscribe safely

I have heard that is better to never click to any link in an email. Is it a bad idea to click to a unsubscribe link? What is the best way to unsubscribe to undesired mails?
2
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2answers
366 views

PHP hack base64 code uploaded and sending mass emails

cPanel server with Exim MTA and Dovecot. Some hacker is finding old scripts at different users public directory, and uploading base64 encoded files then using it to send massive spam. How do I block ...
2
votes
4answers
390 views

How can I stop an IP from trying to use my mail server?

I have recently set up my first email server, and I look at the logs in /var/logs/mail.log to see what is happening, I notice this one IP does this multiple times every day for the last so many weeks :...
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1answer
676 views

Offline malware / script scanner for webfiles (PHP and HTML) [closed]

I have downloaded an entire copy of a website that has been used as a spam relay. I think I have tracked down the problem to a loophole in a contact form (now closed, but was not used, but still ...
5
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4answers
7k views

What does this malicious PHP script do? [closed]

Somebody hacked my site and uploaded this script (template46.php) to my webroot and its content is: <?php $vIIJ30Y = Array('1'=>'F', '0'=>'j', '3'=>'s', '2'=>'l', '5'=>'M', '4'=>'...
4
votes
2answers
401 views

Pawn in a nefarious porn marketing campaign?

About a month ago we upgraded (maybe not the right term) our site to WordPress. In that time we went from about 3800 inbound links (according to Google WebMaster) to about 5000. We exported our list ...
2
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2answers
249 views

Wordpress blog hacked?

There is a Wordpress blog running on Wordpress 4.0. Anyone having the company webmail can signup to the blog using their Google+ account and submit blog posts. Once posted they will be sent to some ...
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2answers
81 views

Dealing with Spam with an unkown party harvesting the email address [closed]

I have a situation where I keep receiving spam from several IT companies (solicitations, marketing etc.). I think I gave away my email to a company in the last couple of years for reading a white ...
6
votes
1answer
4k views

Weird visitor from Samara ----forum.topic5982…908.darodar.com? [closed]

I have seen this question asked about a user from Samara,Russia, and when I sifted through all the other occurances,everything everyone else is experiencing matched my experience, except for one thing....
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5answers
377 views

How to analyze spam email URLs to detect exploits?

I'm receiving spam emails that, looking at the email headers, appear to be coming from a variety of computers around the planet. They're always the same type of email that contains invalid URLs inside ...
3
votes
1answer
1k views

My sendmail started sending spam; what is causing it to do so? [closed]

Today my sendmail service started sending e-mail to various addresses. /var/spool/mail: From MAILER-DAEMON@noxcommunity.com Fri Jan 30 22:15:30 2015 Return-Path: <MAILER-DAEMON@noxcommunity.com&...
0
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2answers
53 views

Does a random number after the login name in the public members section of a website increase security or privacy?

http://forum.example.com/users/username-3723484 vs http://forum.example.com/users/username where username is specific to each user, as is its salt. My hypothesis is that it makes it harder for ...
4
votes
1answer
146 views

Is this some kind of Bayesian poisoning?

So I've been reading my spam lately, and today I received this: To: my actual email, but with a name found here: tel2name.com (only hit on Google) Subject: one seemingly random excerpt of a web ...
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1answer
107 views

Is my account hacked? [closed]

I accidentally opened up a spam email in my junk folder. However I did not open up the attachment. Is my email and computer ok?
2
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3answers
505 views

Strange unsolicited email sent to almost never used email address

What initially looked like typical spam now seems extra odd and is bugging me (only figuratively I hope). Ostensibly, a sales rep from DomainNameSales.com (DNS), which I'd never heard of, sent an ...
3
votes
2answers
928 views

Suspecious js file sent as email attachment

I received a js file with following code in my spam folder but I decided to take a look into the file. Do anybody of you know what does this code might do? var evl='';function nr() { evl = '}; ' + ...
21
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4answers
3k views

Would 'spam' mail really avoid eavesdropping?

spammimic.com offers a service that 'encrypts' your mail as 'spam', the rationale being that all mail services automatically filter out spam, and so if you're wanting to communicate with someone ...
1
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0answers
54 views

Webistes listing email address lists for spammers [closed]

Which websites would you usually check if you suspect that your company's address book has been leaked and is being used by spammers? I have identified https://pwnedlist.com/ for this purpose but was ...
22
votes
3answers
3k views

How does Bayesian poisoning work?

This answer mentions Bayesian poisoning in passing and I've read the wikipedia page but don't feel I've fully grasped it. The first case, where a spammer sends a spam with a payload (link, malicious ...