A hacker has put up for sale 100,544,934 records he claims were stolen from VK.com, a Russian-based social network. This is the same hacker who had previously sold data dumps from MySpace, LinkedIn, Tumblr, and Fling.com.

Named Peace (or Peace_of_mind), the hacker is asking for 1 Bitcoin (~$570) for the entire dataset, which is available for sale on The Real Deal Dark Web marketplace.

Data breach search engine service LeakedSource has got hold of the data from one of the people who bought it. The company has analyzed the dump's contents and has added it to its service. Users can use their search engine and see if their data was compromised.

VK.com stored passwords in cleartext

According to the company's experts, the data dump contains information such as email addresses, first name, last name, location information, phone numbers, sometimes a secondary email, and in all cases a cleartext password.

As of now, nobody knows when VK.com was hacked and this data stolen, but if VK.com still stores passwords in cleartext today, this should be a warning sign for its users.

All the LinkedIn, MySpace, and Tumblr breaches are believed to have taken place between 2012 and 2013, when some sites did not practice up-to-par Web security policies, such as hashing and salting passwords.

Below is a breakdown of the leaked data, with a list of top 25 most popular passwords, top 25 most popular email domains, and a screenshot of Peace's VK.com listing.

Rank Password Frequency Top 25 Passwords from the VK.com data dump 1 123456 709,067 2 123456789 416,591 3 qwerty 291,645 4 111111 189,151 5 1234567890 156,614 6 1234567 141,620 7 12345678 107,799 8 123321 93,048 9 000000 91,981 10 123123 89,461 11 7777777 87,022 12 qwertyuiop 77,256 13 666666 77,048 14 123qwe 68,800 15 555555 66,208 16 zxcvbnm 64,066 17 1q2w3e 62,903 18 gfhjkm 57,386 19 qazwsx 56,465 20 1q2w3e4r 55,251 21 654321 51,680 22 987654321 50,306 23 121212 44,652 24 zxcvbn 44,209 25 777777 42,279

Rank Email Domain Frequency Top 25 email domains from the VK.com data dump 1 @mail.ru 41,132,524 2 NONE 21,877,927 3 @yandex.ru 11,604,169 4 @rambler.ru 7,416,993 5 @bk.ru 2,183,690 6 @gmail.com 2,033,429 7 @list.ru 1,586,503 8 @ukr.net 1,509,641 9 @inbox.ru 1,411,841 10 @yahoo.com 586,902 11 @i.ua 523,155 12 @hotmail.com 522,182 13 @ya.ru 518,710 14 @bigmir.net 413,599 15 @yandex.ua 319,155 16 @meta.ua 308,771 17 @tut.by 227,743 18 @e-mail.ru 147,319 19 @pochta.ru 138,758 20 @qip.ru 123,094 21 @inbox.lv 106,310 22 @vkontakte.ru 105,614 23 @yndex.ru 94,643 24 @e1.ru 84,581 25 @meil.ru 82,608