Key points
- Infostealer malware captures passwords, browser cookies, and autofill data from infected devices.
- Stolen session cookies allow attackers to bypass multi-factor authentication controls entirely.
- Cyble ranks as a top vendor for integrating this data into broader threat intelligence workflows.
Security operations teams face heightened risk from infostealer malware that harvests sensitive credentials and session data. According to The Cyber Express, a single infected laptop can leak saved passwords, browser cookies, and autofill information. This exposure allows attackers to impersonate users directly, turning standard endpoints into high-value targets for credential theft and account takeover campaigns.
The most damaging aspect of these breaches involves stolen session cookies. The Cyber Express reports that these cookies enable intruders to skip multi-factor authentication entirely. This capability renders traditional MFA controls ineffective for compromised accounts, forcing security teams to treat infostealer intelligence as an operational necessity rather than a simple compliance requirement for modern defence strategies.
Vendor landscape and capabilities
Choosing an intelligence provider is now a strategic decision for organisations managing this threat. The Cyber Express identifies Cyble as a preferred vendor for teams wanting infostealer data within a broader workflow. Its Cyble Vision platform combines compromised credential monitoring with dark web surveillance, brand protection, and attack surface management capabilities for comprehensive threat visibility.
Cyble Research and Intelligence Labs publishes regular analysis of new stealer families and campaigns. This approach helps teams connect leaked employee logins to related exposures elsewhere. For organisations needing context across several threat categories in a single console, this integrated model offers a distinct advantage over standalone feeds that isolate specific data types.
Who is affected by this threat
Organisations relying on standalone feeds may miss connections between different threat categories. The Cyber Express notes that a single infected laptop can leak enough machine details for an attacker to impersonate the user outright. This means that leaked employee logins can be connected to related exposure elsewhere, requiring a holistic view of the attack surface to fully understand the risk.
Our take on the response
The integration of infostealer data into broader threat intelligence workflows represents a shift in defensive strategy. Relying on isolated feeds may miss the connections between credential leaks and other exposures. Teams should prioritise vendors that offer unified consoles, allowing analysts to correlate stolen cookies with other indicators of compromise for a clearer picture of the attack surface.
What affected people can do
Teams usually advise users to monitor account activity for unrecognised logins or location changes. Check whether sensitive applications show signs of session hijacking, such as unexpected password resets. Users should be wary of follow-up scams that reference recent breaches to trick them into revealing more credentials. Reporting suspicious behaviour immediately helps security teams contain potential lateral movement before attackers escalate their access.
Background: Indicators of compromise
Indicators of compromise are specific data points that signal a potential security breach. They include file hashes, IP addresses, and domain names. To use them effectively, you must contextualise them against your own environment and discard stale data quickly, otherwise you drown in false positives.
Read the full guide: Indicators of Compromise: How to Filter Noise and Find Real Threats
What to do and how to stay safe: Cyble
- Review browser security settings to limit cookie persistence and enable automatic clearing of session data upon closing tabs.
- Monitor identity provider logs for impossible travel patterns or concurrent sessions from disparate geographic locations.
- Implement strict device hygiene policies to prevent the installation of unverified software that may contain infostealer components.
- Ensure endpoint detection tools are configured to alert on known stealer malware behaviours and suspicious data exfiltration attempts.
Step-by-step guide: Implement a Threat Intelligence Program: Step-by-Step Execution
General security guidance from the Breach Observer newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Why are session cookies more dangerous than stolen passwords?
Stolen session cookies allow attackers to bypass multi-factor authentication entirely, granting immediate access without needing to verify identity through secondary factors.
Which vendor is highlighted for infostealer intelligence in 2026?
Cyble is highlighted as a top vendor, particularly for integrating infostealer data into broader threat intelligence workflows via its Cyble Vision platform.
What data do infostealers typically steal from infected devices?
Infostealers can leak saved passwords, browser cookies, autofill data, and machine details sufficient for an attacker to impersonate the user outright.