Adversaries may interrupt availability of system and network resources by inhibiting access to accounts utilized by legitimate users. Accounts may be deleted, locked, or
manipulated (ex: changed credentials) to remove access to accounts. Adversaries may also subsequently log off and/or perform a System
Shutdown/Reboot to set malicious changes into place.
攻撃者は、正当なユーザが使用するアカウントへのアクセスを阻害することで、システムやネットワークリソースの利用を妨害することがあります。アカウントへのアクセスを遮断するために、アカウントを削除、ロック、または操作（認証情報の変更など）することがあります。攻撃者は、その後、ログオフしたり、システムのシャットダウン／リブートを実行して、悪意のある変更を有効にすることもあります。
In Windows, Net utility, Set-LocalUser and Set-ADAccountPassword PowerShell cmdlets may
be used by adversaries to modify user accounts. In Linux, the passwd utility may be used to change passwords. Accounts could also be disabled by Group Policy.
Windowsでは、Net utility、Set-LocalUserおよびSet-ADAccountPassword
PowerShellコマンドレットが、攻撃者によってユーザーアカウントを変更するために使用されることがあります。Linuxでは、passwdユーティリティがパスワードの変更に使われる場合があります。また、グループポリシーによってアカウントを無効化することも可能です。
Adversaries who use ransomware may first perform this and other Impact behaviors, such as Data Destruction and Defacement, before completing the Data Encrypted for Impact objective.
ランサムウェアを使用する攻撃者は、影響を与えるためのデータ暗号化を完了する前に、データ破壊や改ざんなど、この行動や他の影響を与える行動を最初に実行する可能性があります。
| ID | Name | Description |
|---|---|---|
| G1004 | LAPSUS$ |
LAPSUS$ has removed a targeted organization's global admin accounts to lock the organization out of all access.[3] |
| S0372 | LockerGoga |
LockerGoga has been observed changing account passwords and logging off current users.[1][2] |
| S0576 | MegaCortex |
MegaCortex has changed user account passwords and logged users off the system.[4] |
| S0688 | Meteor |
Meteor has the ability to change the password of local users on compromised hosts and can log off users.[5] |
This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.
この種の攻撃テクニックは、システム機能の悪用に基づくため、予防的対策では容易に軽減することはできません。
| ID | Data Source | Data Component | Detects |
|---|---|---|---|
| DS0026 | Active Directory | Active Directory Object Modification |
Monitor for changes made to AD settings for unexpected modifications to user accounts, such as deletions or potentially malicious changes to user attributes (credentials,
status, etc.). |
| DS0002 | User Account | User Account Deletion |
Monitor for unexpected deletions of user accounts. Windows event logs may designate activity associated with an adversary's attempt to remove an account (ex: Event ID 4726 - A
user account was deleted).
Alerting on these Event IDs may generate a high degree of false positives, so compare against baseline knowledge for how systems are typically used and correlate modification
events with other indications of malicious activity where possible. |
| User Account Modification |
Monitor for changes made to user accounts for unexpected modification of properties, such as passwords or status (enabled/disabled). Windows event logs may designate activity
associated with an adversary's attempt to remove access to an account:Event ID 4723 - An attempt was made to change an account's passwordEvent ID 4724 - An attempt was made to
reset an account's passwordEvent ID 4725 - A user account was disabled
Alerting on these Event IDs may generate a high degree of false positives, so compare against baseline knowledge for how systems are typically used and correlate modification
events with other indications of malicious activity where possible. |