Usual brute-force attack aimed at administrator and db2admin accounts that lasted for an hour. This "person" is using an IP from Montevideo, Mexico. Event Type: Failure Audit Event Source: Security Event Category: Logon/Logoff Event ID: 529 Date: 5/8/2011 Time: 3:34:40 PM User: NT AUTHORITYSYSTEM Computer: SERVER Description: Logon Failure: Reason: Unknown user name or bad password User Name: administrator Domain: aaron-PC Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: AARON-PC Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: 18.104.22.168 Source Port: 0 For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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DNSBL* - is a list of IP addresses published through the Internet Domain Name Service (DNS) either as a zone file that can be used by DNS server software, or as a live DNS zone that can be queried in real-time. DNSBLs are most often used to publish the addresses of computers or networks linked to spamming; most mail server software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.
WHOIS** - is a query/response protocol that is widely used for querying databases in order to determine the registrant or assignee of Internet resources, such as a domain name, an IP address block, or an autonomous system number. WHOIS lookups were traditionally performed with a command line interface application, and network administrators predominantly still use this method, but many simplified web-based tools exist. WHOIS services are typically communicated using the Transmission Control Protocol (TCP). Servers listen to requests on the well-known port number 43.
** Approximate Geographic Location - This is NOT the exact geographical location of the person/organization with the given IP address. However, this should still give you a good idea about the area/region where this person/orgranization is located.