Code Transposition Anti-Disassembly

Code transposition is a technique used by malware authors to evade detection and analysis by rearranging the instructions of a piece of code without changing its behavior. This technique is used to make the code more difficult to read and understand for disassemblers and reverse engineers, as well as to hide the true intent of the code.

There are …

Opaque Predicate Anti-Disassembly

Opaque predicate is a term used in programming to refer to decision making where there is only one possible outcome. This can be achieved through the use of complex or hard-to-understand logic, such as calculating a value that will always return True.

Opaque predicates are often used as anti-disassembling techniques, as they can make it difficult for an analyst …

Tor Network C2 Network Evasion

Tor is a free and open-source network that enables anonymous communication. It uses a network of volunteer-operated servers, known as "relays," to route internet traffic in a way that conceals the user's location and usage from surveillance and traffic analysis. By routing traffic through multiple relays, Tor makes it difficult to trace internet activity back to the user.

Malware …

Peer to peer C2 Network Evasion

Peer-to-peer (P2P) botnets are a type of botnet that uses a decentralized network structure, without a central command and control (C&C) server. Each infected machine in a P2P botnet maintains a list of other trusted computers (including other infected machines), as well as information drop locations and locations where the malware can be updated. Some P2P botnets also use encryption …

API Hammering Sandbox Evasion

API hammering is a technique used to delay sandbox analysis and thus avoid malware capability analysis reporting. This technique consists of calling a large amount of benign APIs like "printf" in a loop.

GetForegroundWindow Sandbox Evasion

This technique uses the GetForegroundWindow and Sleep APIs to attempt to evade sandboxes. Many sandboxes do not alter the foreground window like a user would in a normal desktop environment.

It accomplishes this by making a call to GetForegroundWindow, which returns a handle to the current window. Then the malware sample will sleep for a short time, followed by …

Detecting Online Sandbox Sandbox Evasion

Online sandbox has become very popular for malware analysis. Several malware authors employ such techniques to avoid detection and analysis. Some of these techniques will be summarized here.

Any.Run uses a fake root certificate to spy on sandbox traffic. The first information about the system can be obtained by querying the information of the root certificate. In …

Access Token Manipulation: Parent PID Spoofing Process Manipulating Defense Evasion [Mitre]

Adversaries may spoof the parent process identifier (PPID) of a new process to evade process-monitoring defenses or to elevate privileges. New processes are typically spawned directly from their parent, or calling, process unless explicitly specified.

One way of explicitly assigning the PPID of a new process is via the CreateProcess API call, which supports a parameter that defines the …

Alienyze Packers

Alienyze is a software packer designed to compress executable files, allowing them to reduce the file size of their software as much as possible.

Anti-Debugger techniques that detect and fool present debuggers
Anti-VM techniques that detect sandbox & virtualized environments
Protection from disassemblers and software analysis tools
Hardware …

AsPack Packers

ASPack is an EXE packer created to compress Win32 executable files and to protect them against reverse engineering.

The solution makes Windows programs and libraries smaller up to 70% what leads to a reduction in the download time of compressed applications in local networks and the Internet because of their smaller size compared to uncompressed apps.

The ASPack …

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