# grep 'SSH: banned' /var/spool/mail/root | cut -d' ' -f5 | xargs --replace=xxx geoiplookup xxx | sort | uniq -c | sort -n
and here is the result:
1 GeoIP Country Edition: AE, United Arab Emirates
1 GeoIP Country Edition: BE, Belgium
1 GeoIP Country Edition: BH, Bahrain
1 GeoIP Country Edition: DK, Denmark
1 GeoIP Country Edition: GR, Greece
1 GeoIP Country Edition: HU, Hungary
1 GeoIP Country Edition: IR, Iran, Islamic Republic of
1 GeoIP Country Edition: KW, Kuwait
1 GeoIP Country Edition: KZ, Kazakhstan
1 GeoIP Country Edition: LK, Sri Lanka
1 GeoIP Country Edition: MN, Mongolia
1 GeoIP Country Edition: PR, Puerto Rico
1 GeoIP Country Edition: SN, Senegal
1 GeoIP Country Edition: YE, Yemen
2 GeoIP Country Edition: AR, Argentina
2 GeoIP Country Edition: CR, Costa Rica
2 GeoIP Country Edition: EC, Ecuador
2 GeoIP Country Edition: LT, Lithuania
2 GeoIP Country Edition: OM, Oman
2 GeoIP Country Edition: PA, Panama
2 GeoIP Country Edition: PH, Philippines
2 GeoIP Country Edition: PT, Portugal
3 GeoIP Country Edition: ID, Indonesia
3 GeoIP Country Edition: NL, Netherlands
4 GeoIP Country Edition: AU, Australia
4 GeoIP Country Edition: BG, Bulgaria
4 GeoIP Country Edition: CZ, Czech Republic
4 GeoIP Country Edition: DE, Germany
4 GeoIP Country Edition: MA, Morocco
4 GeoIP Country Edition: PK, Pakistan
4 GeoIP Country Edition: UA, Ukraine
5 GeoIP Country Edition: CL, Chile
5 GeoIP Country Edition: MX, Mexico
5 GeoIP Country Edition: PL, Poland
6 GeoIP Country Edition: CA, Canada
8 GeoIP Country Edition: ES, Spain
9 GeoIP Country Edition: BR, Brazil
9 GeoIP Country Edition: HK, Hong Kong
9 GeoIP Country Edition: JP, Japan
9 GeoIP Country Edition: NZ, New Zealand
10 GeoIP Country Edition: TW, Taiwan
11 GeoIP Country Edition: GB, United Kingdom
12 GeoIP Country Edition: TH, Thailand
12 GeoIP Country Edition: TR, Turkey
13 GeoIP Country Edition: RU, Russian Federation
17 GeoIP Country Edition: IT, Italy
18 GeoIP Country Edition: VN, Vietnam
19 GeoIP Country Edition: CO, Colombia
19 GeoIP Country Edition: EG, Egypt
20 GeoIP Country Edition: FR, France
38 GeoIP Country Edition: IN, India
40 GeoIP Country Edition: KR, Korea, Republic of
53 GeoIP Country Edition: US, United States
72 GeoIP Country Edition: IP Address not found
74 GeoIP Country Edition: PE, Peru
211 GeoIP Country Edition: CN, China
It's no surprise who does the most break-in attempts. For me, the second one in the list is a bit surpising. Peru is either a haven for hackers or it has a lot of insecure computers that are the jumping points for other hackers in other countries. I don't know much about Peru.