If you spend any time at all looking at log data from any server that is accessible to the Internet, you will be shocked at the brazen attempts to knock the castle over. They being within minutes of the server being available. They most commonly include port scans, login attempts using default username/password, web server attacks described by OWASP.
How can this possibly be? Given the sheer number of machines that are visible on the Internet? Don’t these guys have anything better to do?
The answer is automation and scripted attacks, also known as spray and pray. The bad guys are capitalists too (regardless of country of origin!) and need to maximize their effort, computing capacity and network bandwidth usage. Accordingly, they use automation to “knock on all available doors in a wealthy neighborhood” as efficiently and regularly as possible. Why pick on servers in developed countries? Because that’s where the payoff is likely to be higher. Its Risk v. Reward all the way.
The automated (first) wave of these attacks is to identify vulnerable machines and establish presence. Following waves may be staffed depending on the the location and identity and thus the potential value to be obtained by a greater investment of (scarce) expertise by the attacker.
Such attacks can be deterred quite simply by using secure (non-default) configuration, system patching and basic security defenses such as firewall and anti-virus. This explains the repeated exhortations of security pundits on “best practice” and also the rationale behind compliance standards and auditors trying to enforce basic minimum safeguards.
The 80/20 rule applies to attackers just as it does to defenders. Attackers are trying to cover 80% of the ground at 20% of the cost so as to at-least identify soft high value targets and at most steal from them. Defenders are trying to deter 80% of the attackers at 20% of cost by using basic best practices.
Guidance such as SANS Critical Controls or lessons from Verizon’s Annual Data Breach studies can help you prioritize your actions. Attackers depend on the fact that the majority of users do not follow basic security hygiene, don’t collect logs which would expose the attackers actions and certainly never actually look at the logs.
Defeating a “spray and pray” attacks requires basic tooling and discipline. The easy way to so this? We call it SIEM Simplified. Drop us a shout, it beats being a victim.