Preface

WeHeartIt, an image sharing website, suffered a data breach in late 2013. However, the breach was not discovered until it suddenly appeared on the web a few years later. The company stated that the data breach affected over 8 million customers.

What data is at risk?

The WeHeartIt data breach took place in late 2013 and the breached data includes email addresses, usernames and passwords. According to WeHeartIt themselves, although the passwords were encrypted, the encryption algorithm was weak:

the encryption algorithms commonly used to encrypt passwords in 2013 are no longer secure due to advancements in computer hardware.

WeHeartIt

In a blog post the company said that it has made improvements to its security protocols, password security, its database and the whole system in general. At the time the data breach was announced, the company was still hashing their customers’ passwords with a more secure password hashing algorithm – BCrypt.

Email addresses

The WeHeartIt data breach does not hold that many records compared to some of the other data breaches but on the other hand, it holds over 8 million records. With that many people at risk, naturally there are hundreds of email domains used by WeHeartIt customers. Here’s the top 100 email domains used in the breach:

#	Email Domain	Quantity
1	hotmail.com	2,588,267
2	gmail.com	2,324,102
3	yahoo.com	1,064,937
4	live.com	146,636
5	aol.com	136,488
6	hotmail.fr	118,576
7	hotmail.co.uk	108,108
8	qq.com	79,613
9	mail.ru	75,017
10	web.de	74,567
11	ymail.com	66,480
12	hotmail.it	62,257
13	hotmail.de	53,262
14	live.nl	43,240
15	gmx.de	39,798
16	icloud.com	36,766
17	aim.com	33,472
18	msn.com	32,750
19	me.com	32,651
20	hotmail.es	32,005
21	googlemail.com	30,525
22	live.fr	30,118
23	rocketmail.com	29,613
24	live.se	29,113
25	live.it	24,632
26	yahoo.de	23,530
27	outlook.com	23,372
28	yahoo.com.br	21,916
29	live.co.uk	21,192
30	comcast.net	20,587
31	windowslive.com	18,252
32	live.no	17,768
33	hotmail.con	16,779
34	libero.it	16,734
35	yandex.ru	16,515
36	wp.pl	16,196
37	yahoo.co.uk	16,114
38	163.com	15,317
39	live.de	15,186
40	hotmail.ca	15,115
41	abv.bg	14,790
42	live.ca	14,455
43	hotmail.se	14,280
44	seznam.cz	14,138
45	yahoo.fr	13,854
46	i.softbank.jp	13,034
47	hotmail.nl	13,004
48	hotmail.no	12,899
49	yahoo.co.id	12,790
50	live.com.mx	12,590
51	ezweb.ne.jp	12,054
52	freemail.hu	11,482
53	gmail.con	10,142
54	sbcglobal.net	9,710
55	yahoo.it	9,688
56	citromail.hu	9,660
57	live.com.au	9,123
58	t-online.de	8,970
59	orange.fr	8,324
60	inbox.lv	8,215
61	att.net	7,922
62	yahoo.ca	7,829
63	live.dk	7,777
64	walla.com	7,770
65	o2.pl	7,462
66	verizon.net	7,050
67	mail.com	6,982
68	gmx.net	6,905
69	126.com	6,745
70	gmx.at	6,713
71	yahoo.con	6,555
72	laposte.net	6,411
73	hotmail.co.nz	6,078
74	naver.com	6,064
75	live.cl	5,505
76	hotmail.be	5,484
77	rambler.ru	5,476
78	bk.ru	5,414
79	softbank.ne.jp	5,309
80	live.com.ar	5,139
81	yahoo.com.ph	4,994
82	live.be	4,950
83	hotmail.com.ar	4,835
84	yahoo.es	4,786
85	yahoo.co.jp	4,715
86	interia.pl	4,604
87	cox.net	4,528
88	op.pl	4,419
89	luukku.com	4,371
90	hotmail.ch	4,272
91	yahoo.gr	4,233
92	bluewin.ch	4,189
93	alice.it	4,098
94	hotmail.fi	4,085
95	btinternet.com	4,063
96	yahoo.com.mx	4,049
97	onet.pl	3,963
98	sina.com	3,944
99	yahoo.com.au	3,883
100	gmx.ch	3,822

Looking at the data, we can tell that WeHeartIt had customers from multiple countries – the TLDs alone tell a lot:

#	Email Domain	Quantity	Country
1	bluewin.ch	2,588,267	Switzerland
2	hotmail.fr	118,576	France
3	hotmail.co.uk	108,108	Great Britain
4	mail.ru	75,017	Russia
5	web.de	74,567	Germany
6	hotmail.es	32,005	Spain
7	live.se	29,113	Sweden
8	live.it	24,632	Italy
9	yahoo.com.br	21,916	Brazil
10	live.no	17,768	Norway
11	wp.pl	16,196	Poland
12	hotmail.ca	15,115	Canada
13	abv.bg	14,790	Bulgaria
14	seznam.cz	14,138	Czech Republic
15	i.softbank.jp	13,034	Japan
16	hotmail.nl	13,004	The Netherlands
17	yahoo.co.id	12,790	India
18	citromail.hu	9,660	Hungary
19	live.com.au	9,123	Australia
20	inbox.lv	8,215	Latvia
21	live.dk	7,777	Denmark
22	live.com.ar	5,139	Argentina
23	yahoo.com.ph	4,994	The Phillipines
24	live.be	4,950	Belgium
25	hotmail.fi	4,085	Finland

The WeHeartIt data breach contained email addresses beginning with numbers. Here’s the breakdown:

The Number An Email Address Starts With	Quantity
0	3,177
1	30,795
2	13,199
3	12,237
4	11,575
5	9,619
6	6,580
7	7,735
8	7,174
9	7,956

Here’s the breakdown of email addresses beginning with letters:

The Letter An Email Address Starts With	Quantity
a	849,437
b	395,243
c	545,333
d	354,621
e	336,285
f	226,617
g	260,492
h	257,914
i	225,872
j	473,717
k	432,979
l	599,189
m	901,829
n	333,116
o	93,303
p	284,974
q	17,981
r	301,848
s	744,387
t	323,095
u	27,246
v	185,368
w	90,045
x	69,911
y	92,432
z	70,105

As the breached data had also contained usernames, here’s the breakdown of usernames beginning with numbers:

The Number A Username Starts With	Quantity
0	7,636
1	24,458
2	8,688
3	7,183
4	4,344
5	4,387
6	2,641
7	4,190
8	3,294
9	4,442

Here’s the breakdown of usernames beginning with letters:

The Letter A Username Starts With	Quantity
a	799,366
b	411,781
c	527,253
d	354,888
e	315,451
f	245,673
g	238,174
h	276,455
i	272,739
j	437,981
k	407,330
l	616,830
m	859,625
n	324,536
o	105,614
p	282,271
q	20,637
r	285,472
s	745,826
t	343,690
u	37,564
v	174,377
w	105,421
x	93,553
y	104,884
z	69,486

The conclusion

The WeHeartIt data breach, although relatively small, is a reminder that old systems are targets of hackers too – even legacy systems that have been abandoned by developers can come back to haunt them years later.