BlockInput Others

As per Microsoft's documentation, BlockInput function "prevents keyboard and mouse input events from reaching applications," effectively restricting user interaction with the system.

Malware occasionally employs this tactic to hinder analysis by debuggers or other analysis tools throughout the process' runtime. To deactivate the block, the program must make a live call to BlockInput with the parameter 0. Windows automatically …

AppInit DLL Injection Process Manipulating Defense Evasion [Mitre]

Any Dynamic Link Libraries (DLL) that are specified within the AppInit_DLLs registry key values are loaded by user32.dll into any process that utilizes user32.dll. So by modifying the AppInit_DLLs registry key value and pointing it to a malicious DLL, an attacker can force the system to load their DLL into every process that utilizes user32.dll and force it to execute …

bochs CPU oversights evasion Sandbox Evasion

bochs has multiple oversights in its CPU emulation, which allows us to detect if we're running in a bochs emulator:

bochs may have invalid CPU brands that don't exist.

For AMD CPUs, the "p" in "processor" should be in capital, which bochs doesn't implement.
AMD CPUs have easter eggs for their K7 and K8 CPUs ("IT'S …

kernel flag inspection via sysctl Anti-Debugging

The sysctl anti-debugging technique can be abused by malware to detect and evade debugging tools on macOS or BSD-like systems. By querying the kernel for process information, malware checks flags (e.g., 0x800) to see if a debugger is attached. If detected, the malware can terminate, alter behavior, or enter a dormant state to avoid analysis.

This technique blends …

XProtect Encryption Abuse Data Obfuscation

Malware can abuse Apple's macOS XProtect string encryption algorithm to hide critical strings, including commands, browser paths, extension IDs, cryptocurrency wallet locations, and command-and-control (C2) details.

This technique leverages the same XOR-based encryption logic implemented in macOS’s XProtect antivirus engine, this encryption is used for “encrypted YARA rules stored within the XProtect Remediator binaries”.

The encryption process involves …

Manipulating Debug Logs Anti-Forensic

Using the sed -i command, specific entries in debug logs, such as errors (segfault, SystemError) or trace information (e.g., filenames like main.cc), are surgically removed. This allows attackers to target only incriminating evidence without erasing the entire log file. The process preserves the structure and authenticity of the log while removing key evidence of exploitation or system errors.

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Deleting Troubleshoot Information and Core Dumps Anti-Forensic

Commands like rm -rf /data/var/statedumps/* and rm -rf /data/var/cores/* delete state dumps and core dumps, which are generated when processes crash. These files contain memory snapshots, stack traces, and runtime states of processes at the time of failure. They are often used to debug and understand the causes of crashes or application malfunctions.

Attackers use this technique to eliminate …

Indirect Memory Writing Antivirus/EDR Evasion

In code-injection scenarios, for example, when a loader places a payload into memory for execution, many antimalware engines detect or block malicious activity at the moment the payload bytes are written into the newly allocated executable memory region. Attackers may try to evade such detection by avoiding direct writes to new memory region and instead relying on other, legitimate Windows …

Hook Injection Process Manipulating

Hook injection is a technique used by malware to alter the behavior of internal functions in an operating system or application. This is typically achieved by inserting malicious code into existing function calls, allowing the malware to intercept and manipulate the normal flow of execution.

In the case of Windows, the SetWindowsHookEx function can be used by programs to …

Injection using Shims Process Manipulating

Microsoft provides Shims to developers mainly for backward compatibility. Shims allow developers to apply fixes to their programs without the need of rewriting code. By leveraging shims, developers can tell the operating system how to handle their application. Shims are essentially a way of hooking into APIs and targeting specific executables. Malware can take advantage of shims to target an …

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