Kaspersky Threats — Backdoor.MSIL.Agent.zhx

クラス: Backdoor

バックドアは、悪意のあるユーザーが感染したコンピュータをリモートコントロールできるように設計されています。機能性の面では、バックドアはソフトウェア開発者が設計し配布する多くの管理システムに似ています。これらの種類の悪質なプログラムは、ファイルの送受信、ファイルの起動や削除、メッセージの表示、データの削除、コンピュータの再起動など、感染したコンピュータ上で必要な作業を可能にします。このカテゴリのプログラムは、被害者のコンピュータのグループを結びつけ、ボットネットまたはゾンビネットワークを形成するためです。これにより、悪意のあるユーザーは感染したコンピュータの軍隊を集中管理し、犯罪目的で使用することができます。 Net-Wormのように、ネットワークを介して拡散して他のコンピュータに感染することができるバックドアのグループもあります。違いは、このようなBackdoorは（Net-Wormのように）自動的に広がるのではなく、それらを制御する悪意のあるユーザーからの特別な「コマンド」に限られるということです。

プラットフォーム: MSIL

Common Intermediate Language（旧称Microsoft Intermediate Language、またはMSIL）は、Microsoftが.NET Framework用に開発した中間言語です。 CILコードは、Microsoft Visual Studio（Visual Basic .NET、Visual C ++、Visual C＃など）のすべてのMicrosoft .NETコンパイラによって生成されます。

ファミリー: Backdoor.MSIL.Agent

No family description

Examples

6CAA0B6FE0FA666DA357BD20F85FDB7C

Tactics and Techniques: Mitre*

TA0003

Persistence

The adversary is trying to maintain their foothold. Persistence consists of techniques that adversaries use to keep access to systems across restarts, changed credentials, and other interruptions that could cut off their access. Techniques used for persistence include any access, action, or configuration changes that let them maintain their foothold on systems, such as replacing or hijacking legitimate code or adding startup code.

T1547.001

Registry Run Keys / Startup Folder

Adversaries may achieve persistence by adding a program to a startup folder or referencing it with a Registry run key. Adding an entry to the "run keys" in the Registry or startup folder will cause the program referenced to be executed when a user logs in. These programs will be executed under the context of the user and will have the account's associated permissions level.

TA0004

Privilege Escalation

The adversary is trying to gain higher-level permissions. Privilege Escalation consists of techniques that adversaries use to gain higher-level permissions on a system or network. Adversaries can often enter and explore a network with unprivileged access but require elevated permissions to follow through on their objectives. Common approaches are to take advantage of system weaknesses, misconfigurations, and vulnerabilities. Examples of elevated access include: SYSTEM/root level, local administrator, user account with admin-like access, user accounts with access to specific system or perform specific function. These techniques often overlap with Persistence techniques, as OS features that let an adversary persist can execute in an elevated context.

T1134

Access Token Manipulation

Adversaries may modify access tokens to operate under a different user or system security context to perform actions and bypass access controls. Windows uses access tokens to determine the ownership of a running process. A user can manipulate access tokens to make a running process appear as though it is the child of a different process or belongs to someone other than the user that started the process. When this occurs, the process also takes on the security context associated with the new token.

T1547.001

Registry Run Keys / Startup Folder

TA0005

Defense Evasion

The adversary is trying to avoid being detected. Defense Evasion consists of techniques that adversaries use to avoid detection throughout their compromise. Techniques used for defense evasion include uninstalling/disabling security software or obfuscating/encrypting data and scripts. Adversaries also leverage and abuse trusted processes to hide and masquerade their malware. Other tactics' techniques are cross-listed here when those techniques include the added benefit of subverting defenses.

T1134

Access Token Manipulation

TA0006

Credential Access

The adversary is trying to steal account names and passwords. Credential Access consists of techniques for stealing credentials like account names and passwords. Techniques used to get credentials include keylogging or credential dumping. Using legitimate credentials can give adversaries access to systems, make them harder to detect, and provide the opportunity to create more accounts to help achieve their goals.

T1555.004

Windows Credential Manager

Adversaries may acquire credentials from the Windows Credential Manager. The Credential Manager stores credentials for signing into websites, applications, and/or devices that request authentication through NTLM or Kerberos in Credential Lockers (previously known as Windows Vaults).

TA0007

Discovery

The adversary is trying to figure out your environment. Discovery consists of techniques an adversary may use to gain knowledge about the system and internal network. These techniques help adversaries observe the environment and orient themselves before deciding how to act. They also allow adversaries to explore what they can control and what's around their entry point in order to discover how it could benefit their current objective. Native operating system tools are often used toward this post-compromise information-gathering objective.

T1217

Browser Information Discovery

Adversaries may enumerate information about browsers to learn more about compromised environments. Data saved by browsers (such as bookmarks, accounts, and browsing history) may reveal a variety of personal information about users (e.g., banking sites, relationships/interests, social media, etc.) as well as details about internal network resources such as servers, tools/dashboards, or other related infrastructure.