Search Evasion Techniques
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Killing Windows Event Log Anti-Forensic
Killing the Windows Event Log is a technique used by malware to prevent security professionals from detecting and analyzing it. Svchost.exe is a process that manages services on Windows operating systems.
By grouping multiple services into a single process, Svchost.exe conserves computing resources and reduces resource consumption. However, this also means that Svchost.exe manages the Event Log service, which is …
Unloading Sysmon Driver Anti-Monitoring
Sysmon is a tool that can be used to monitor system activity on Windows systems. It records various types of events, such as process creation, network connections, and registry changes, and stores them in the Windows Event Log. Security analysts can use this information to detect and investigate malicious activity on a system.
One way that malware can evade detection …
Indicator Removal: Clear Windows Event Logs Defense Evasion [Mitre] Anti-Forensic
Event logging is a process that records important software and hardware events from various sources and stores them in a centralized location called an event log. This service is commonly used by applications and operating systems to track and troubleshoot issues, and can be a valuable tool for forensic investigations.
Event logs can provide valuable information about the actions taken …
Impair Defenses: Indicator Blocking Defense Evasion [Mitre]
An adversary may attempt to block indicators or events typically captured by sensors from being gathered and analyzed. This could include maliciously redirecting or even disabling host-based sensors, such as Event Tracing for Windows (ETW), by tampering settings that control the collection and flow of event telemetry. These settings may be stored on the system in configuration files and/or in …
Impair Defenses: Disable Windows Event Logging Defense Evasion [Mitre]
Adversaries may disable Windows event logging to limit data that can be leveraged for detections and audits. Windows event logs record user and system activity such as login attempts, process creation, and much more. This data is used by security tools and analysts to generate detections.
The EventLog service maintains event logs from various system components and applications. By default, …
Windows Event Log Evasion via Native APIs Anti-Forensic
Attackers can leverage native Windows API calls to install malicious services without generating correlating entries in the event log. Using native APIs to install services instead of the standard API calls allow attackers to bypass security controls and event logging. This technique was utilised by Stuxnet.
Services are typically created through a standard Windows API call CreateServiceA or CreateService. …
Impair Defenses: Downgrade Attack Defense Evasion [Mitre]
Adversaries may downgrade or use a version of system features that may be outdated, vulnerable, and/or does not support updated security controls such as logging. For example, PowerShell versions 5+ includes Script Block Logging (SBL) which can record executed script content. However, adversaries may attempt to execute a previous version of PowerShell that does not support SBL with the intent …
Rogue Domain Controller Defense Evasion [Mitre]
Adversaries may register a rogue Domain Controller to enable manipulation of Active Directory data. DCShadow may be used to create a rogue Domain Controller (DC). DCShadow is a method of manipulating Active Directory (AD) data, including objects and schemas, by registering (or reusing an inactive registration) and simulating the behavior of a DC. Once registered, a rogue DC may be …
Disabling Event Tracing for Windows (ETW) Anti-Forensic
Many EDR solutions leverage Event Tracing for Windows (ETW) extensively. ETW allows for extensive instrumentation and tracing of a process functionality and WINAPI calls. It has components in the kernel, to register callbacks for system calls and other kernel operations, but also consists of a userland component that is part of ntdll.dll.
Since ntdll.dll is a DLL loaded into the …
Indicator Removal: Clear Command History Defense Evasion [Mitre]
In addition to clearing system logs, an adversary may clear the command history of a compromised account to conceal the actions undertaken during an intrusion. Various command interpreters keep track of the commands users type in their terminal so that users can retrace what they've done.
On Windows hosts, PowerShell has two different command history providers: the built-in history and …