| ID | Name |
|---|---|
| T1550.001 | Application Access Token |
| T1550.002 | Pass the Hash |
| T1550.003 | Pass the Ticket |
| T1550.004 | Web Session Cookie |
Adversaries can use stolen session cookies to authenticate to web applications and services. This technique bypasses some multi-factor authentication protocols since the session is already authenticated.[1]
Authentication cookies are commonly used in web applications, including cloud-based services, after a user has authenticated to the service so credentials are not passed and re-authentication does not need to occur as frequently. Cookies are often valid for an extended period of time, even if the web application is not actively used. After the cookie is obtained through Steal Web Session Cookie or Web Cookies, the adversary may then import the cookie into a browser they control and is then able to use the site or application as the user for as long as the session cookie is active. Once logged into the site, an adversary can access sensitive information, read email, or perform actions that the victim account has permissions to perform.
There have been examples of malware targeting session cookies to bypass multi-factor authentication systems.[2]
| ID | Name | Description |
|---|---|---|
| C0024 | SolarWinds Compromise |
During the SolarWinds Compromise, APT29 used stolen cookies to access cloud resources and a forged |
| G1033 | Star Blizzard |
Star Blizzard has bypassed multi-factor authentication on victim email accounts by using session cookies stolen using EvilGinx.[5] |
| ID | Mitigation | Description |
|---|---|---|
| M1054 | Software Configuration |
Configure browsers or tasks to regularly delete persistent cookies. |
| ID | Name | Analytic ID | Analytic Description |
|---|---|---|---|
| DET0074 | Detect Use of Stolen Web Session Cookies Across Platforms | AN0201 |
Anomalous access to cloud web applications using session tokens without corresponding MFA/credential validation, often from unusual locations or device fingerprints. |
| AN0202 |
Session cookie reuse on unmanaged browsers, devices, or client types deviating from user baseline (e.g., switching from Chrome to curl). |
||
| AN0203 |
Web session tokens reused in native Office apps (e.g., Outlook, Teams) without associated token refresh or login behavior on the endpoint. |