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That said, some example user agents often seen during a password spray are:

User agents: This is not an immutable variable and is simple to spoof, so don’t always rely on the user agent string to tell the truth.

Attackers can utilize this tactic, also called “credential stuffing,” to easily gain entry because it relies on people reusing passwords and usernames across sites.

Availability and reuse: With a new breach being announced publicly every month, the amount of compromised credentials posted on the dark web is rising rapidly.

The most sophisticated password sprays will use several individual IP addresses to attack multiple accounts at the same time with a limited number of curated password guesses.

Low and slow: Patience is key for a determined threat actor.

Sophisticated password spray techniques include some of the following qualities: Password spray methods: These are different from brute-force attacks, which involve attackers using a custom dictionary or wordlist and attempting to attack a small number of user accounts. Password spray attacks are authentication attacks that employ a large list of usernames and pair them with common passwords in an attempt to “guess” the correct combination for as many users as possible.

Microsoft darts how to#

To understand how to protect against, and investigate a password spray attack, it is important to understand what it is. This creates a repeating cycle attack pattern, where one compromised account can lead to access to resources where additional credentials can be harvested, and thus even further resource access.įigure 1. Once attackers have gained the credentials to an account, they can access any sensitive resources that users can access and have the malicious activity appear as normal. This is why identity attacks have become so popular. While these mitigations are necessary best practices, in the case of a compromised trusted user, they are ineffective at preventing unauthorized access. The approach to securing user accounts is well-intentioned, but it is often incomplete, with a large investment that typically goes into areas such as complex password policies and limiting access to resources from networks perceived as secure.

Microsoft darts software#

As software becomes more intelligent at detecting abnormal programs and vulnerabilities, attacks against our customers are rapidly becoming more focused on breaking into identities rather than breaking into a network. Previously, threat actors focused on attacking computers to gain access into an environment. Why are identity-based attacks suddenly so popular? In this blog, we are going to define what password sprays are, detail DART’s investigation techniques and approach to responding to password spray attacks, and outline our recommendations for protecting against them. This threat is a moving target with techniques and tools always changing, and Microsoft continues to find new ways to detect these types of attacks and help protect its customers. Over the past year, the Microsoft Detection and Response Team (DART), along with Microsoft’s threat intelligence teams, have observed an uptick in the use of password sprays as an attack vector.

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