As unhealthy actors typically merely waltz by way of corporations’ digital entrance doorways with a key, right here’s easy methods to hold your personal door locked tight
11 Sep 2025
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5 min. learn
Why break a door down and set the home alarm off when you may have a key and a code to stroll in silently? That is the rationale behind a pattern in cybersecurity the place adversaries are more and more seeking to steal passwords, and even authentication tokens and session cookies to bypass MFA codes to allow them to entry networks by masquerading as authentic customers.
Based on Verizon, “use of stolen credentials” has been one of the vital widespread strategies for gaining preliminary entry over current years. Using stolen credentials appeared in a 3rd (32%) of knowledge breaches final yr, its report notes. Nevertheless, whereas there are a number of methods risk actors can pay money for credentials, there are additionally loads of alternatives to cease them.
Why credentials are floor zero for cyberattacks
Based on one estimate, over 3.2 billion credentials had been stolen from world companies in 2024, a 33% annual improve. With the entry these present to company accounts, risk actors can successfully slip into the shadows whereas plotting their subsequent transfer. This may contain some extra superior types of prison exploitation, for instance:
- Conducting community reconnaissance: searching for knowledge, belongings and person permissions to go after subsequent
- Escalating privileges, e.g. through vulnerability exploitation, in an effort to transfer laterally to achieve these high-value knowledge shops/programs
- Covertly establishing communications with a command-and-control (C2) server, to obtain extra malware from and exfiltrate knowledge
By working by way of these steps, an adversary may additionally perform extremely profitable ransomware and different campaigns.
How they pay money for passwords
Risk actors have developed varied methods to compromise your workers’ company credentials or, in some instances, even their MFA codes. They embody:
- Phishing: Emails or texts spoofed to look as if despatched from an official supply (i.e., the IT division, or a tech provider). The recipient will probably be inspired to click on on a malicious hyperlink taking them to a faux login web page (i.e., Microsoft).
- Vishing: A variation on the phishing theme, however this time a sufferer receives a telephone name from the risk actor. They might impersonate the IT helpdesk and request the sufferer arms over a password or enroll a brand new MFA system as a part of some fictitious again story. Or they may name the helpdesk claiming to be an govt or worker who wants an pressing password reset to get their job completed.
- Infostealers: Malware designed to reap credentials and session cookies from the sufferer’s pc/system. It would arrive through a malicious phishing hyperlink/attachment, a compromised web site, a booby-trapped cell app, a social media rip-off and even an unofficial video games mod. Infostealers are thought to have been accountable for 75% of compromised credentials final yr.
- Brute-force assaults: These embody credential stuffing, the place adversaries strive beforehand breached username/password combos in opposition to company websites and apps. Password spraying, in the meantime, leverages generally used passwords throughout totally different websites. Automated bots assist them to take action at scale, till one lastly works.
- Third-party breaches: Adversaries compromise a provider or accomplice which shops credentials for its purchasers, equivalent to an MSP or a SaaS supplier. Or they purchase up troves of already breached login “combos” to make use of in subsequent assaults.
- MFA bypass: The strategies embody SIM swapping, MFA immediate bombing that overwhelms the goal with push notifications in an effort to trigger “alert fatigue” and elicit a push approval, and Adversary-in-the-Center (AitM) assaults the place attackers insert themselves between a person and a authentic authentication service to intercept MFA session tokens.
The previous few years have been awash with real-world examples of password compromise resulting in main safety incidents. They embody:
- Change Healthcare: In one of the vital important cyberattacks of 2024, the ransomware group ALPHV (BlackCat) crippled Change Healthcare, a serious U.S. healthcare expertise supplier. The gang leveraged a set of stolen credentials to remotely entry a server that didn’t have multifactor authentication (MFA) turned on. They then escalate their privileges and moved laterally throughout the programs and deployed ransomware, which finally led to an unprecedented disruption of the healthcare system and the theft of delicate knowledge on thousands and thousands of Individuals.
- Snowflake: Financially motivated risk actor UNC5537 gained entry to the Snowflake buyer database cases of a number of purchasers. Lots of of thousands and thousands of downstream prospects had been impacted by this large knowledge theft extortion marketing campaign. The risk actor is assumed to have accessed their environments through credentials beforehand stolen through infostealer malware.
Preserve your eyes peeled
All of which makes it extra vital than ever to guard your workers’ passwords, make logins safer, and monitor the IT setting extra carefully for the tell-tale indicators of a breach.
A lot of this may be achieved by following a Zero Belief strategy primarily based across the tenet: by no means belief, at all times confirm. It means adopting risk-based authentication on the “perimeter” after which at varied phases inside a segmented community. Customers and gadgets needs to be assessed and scored primarily based on their threat profile, which will be calculated from time and placement of login, system kind, and session habits. To bolster your group’s safety from unauthorized entry and to make sure compliance with laws, rock-solid multi-factor authentication (MFA) can also be a non-negotiable line of protection.
You must complement this strategy with up to date coaching and consciousness packages for workers, together with real-world simulations utilizing the most recent social engineering strategies. Strict insurance policies and instruments stopping customers from visiting dangerous websites (the place infostealers may lurk) are additionally vital, as is safety software program on all servers, endpoints and different gadgets, and steady monitoring instruments to identify suspicious habits. The latter will enable you to detect adversaries which may be inside your community courtesy of a compromised credential. Certainly, organizations additionally have to have a means of lowering the injury a compromised account can do, for instance by following the precept of least privilege. Lastly, darkish net monitoring may also help you examine if any enterprise credentials are up on the market on the cybercrime underground.
Extra broadly, take into account enlisting the assistance of an skilled third get together through a managed detection and response (MDR) service. particularly if your organization is brief on assets. Along with decrease whole value of possession, a good MDR supplier brings subject-matter experience, round the clock monitoring and risk looking, and entry to analysts who perceive the nuances of credential-based intrusions and may speed up incident response if compromised accounts are detected.
