An adversary with root access may gather credentials by reading securityd’s memory. securityd is a service/daemon responsible for implementing security protocols such as encryption and authorization.(Citation: Apple Dev SecurityD) A privileged adversary may be able to scan through securityd's memory to find the correct sequence of keys to decrypt the user’s logon keychain. This may provide the adversary with various plaintext passwords, such as those for users, WiFi, mail, browsers, certificates, secure notes, etc.(Citation: OS X Keychain)(Citation: OSX Keydnap malware)
In OS X prior to El Capitan, users with root access can read plaintext keychain passwords of logged-in users because Apple’s keychain implementation allows these credentials to be cached so that users are not repeatedly prompted for passwords.(Citation: OS X Keychain)(Citation: External to DA, the OS X Way) Apple’s securityd utility takes the user’s logon password, encrypts it with PBKDF2, and stores this master key in memory. Apple also uses a set of keys and algorithms to encrypt the user’s password, but once the master key is found, an adversary need only iterate over the other values to unlock the final password.(Citation: OS X Keychain)
| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| CA-07 | Continuous Monitoring | mitigates | T1555.002 | Securityd Memory | |
| IA-05 | Authenticator Management | mitigates | T1555.002 | Securityd Memory | |
| SI-04 | System Monitoring | mitigates | T1555.002 | Securityd Memory | |
| AC-03 | Access Enforcement | mitigates | T1555.002 | Securityd Memory | |
| AC-06 | Least Privilege | mitigates | T1555.002 | Securityd Memory |
| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| action.malware.variety.Password dumper | Password dumper (extract credential hashes) | related-to | T1555.002 | Securityd Memory | |
| action.malware.variety.RAM scraper | RAM scraper or memory parser (capture data from volatile memory) | related-to | T1555.002 | Securityd Memory | |
| attribute.confidentiality.data_disclosure | None | related-to | T1555.002 | Securityd Memory |
| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| alerts_for_linux_machines | Alerts for Linux Machines | technique_scores | T1555.002 | Securityd Memory |
Comments
This control can detect command execution associated with this technique.
References
|