Valid Accounts: Default Accounts

Adversaries may obtain and abuse credentials of a default account as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion. Default accounts are those that are built-into an OS, such as the Guest or Administrator accounts on Windows systems or default factory/provider set accounts on other types of systems, software, or devices.[1]

Default accounts are not limited to client machines, rather also include accounts that are preset for equipment such as network devices and computer applications whether they are internal, open source, or commercial. Appliances that come preset with a username and password combination pose a serious threat to organizations that do not change it post installation, as they are easy targets for an adversary. Similarly, adversaries may also utilize publicly disclosed or stolen Private Keys or credential materials to legitimately connect to remote environments via External Remote Services.[2]

Mitigations

This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.

Detection

Monitor whether default accounts have been activated or logged into. These audits should also include checks on any appliances and applications for default credentials or SSH keys, and if any are discovered, they should be updated immediately.

References

Attachments

ID
VT0005.001
Sub-techniques
Tactics
Defense Evasion
Persistence
Privilege Escalation
Initial Access
Platforms
AWS
Azure
Azure AD
GCP
Linux
Office 365
SaaS
Windows
macOS
Permissions Required
Administrator
User
Data Sources
AWS CloudTrail logs
Authentication logs
Process monitoring
Stackdriver logs
CAPEC ID
Version
1.1

Created: 02 December 2020

Last Modified: 27 December 2020