Browse Rules

Unprivileged Delegation of Page Faults Handling to a Userspace Process

Detect a successful unprivileged userfaultfd syscall, which could serve as an attack primitive for exploiting other vulnerabilities. To fine-tune this rule, consider using the template list "user_known_userfaultfd_processes".

Service Binary Modifications

Adversaries may modify the binary file for an existing service to achieve [Persistence](https://attack.mitre.org/tactics/TA0003) while potentially [evading defenses](https://attack.mitre.org/tactics/TA0005). If a newly created or modified runs as a service, it may indicate APT activity. However, services are frequently installed by legitimate software. A well-tuned baseline is essential to differentiating between benign and malicious service modifications. ### Output Description The Service Na

RunDLL32.exe monitoring

Adversaries may find it necessary to use [Dyanamic-link Libraries](https://msdn.microsoft.com/en-us/library/windows/desktop/ms682589.aspx) (DLLs) to [evade defenses](https://attack.mitre.org/tactics/TA0005). One way these DLLs can be "executed" is through the use of the built-in Windows utility [RunDLL32](https://attack.mitre.org/techniques/T1218.011), which allows a user to execute code in a DLL, providing the name and optional arguments to an exported entry point. Windows uses RunDll32 legitim

Suspicious Arguments

Malicious actors may rename built-in commands or external tools, such as those provided by SysInternals, to better [blend in](https://attack.mitre.org/tactics/TA0005) with the environment. In those cases, the file path name is arbitrary and may blend in well with the background. If the arguments are closely inspected, it may be possible to infer what tools are running and understand what an adversary is doing. When any legitimate software shares the same command lines, it must be whitelisted acc

Running executables with same hash and different names

Executables are generally not renamed, thus a given hash of an executable should only have ever one name. Identifying instances where multiple process names share the same hash may find cases where tools are copied by attackers to different folders or hosts to [avoid detection](https://attack.mitre.org/tactics/TA0005). Although this analytic was initially based on MD5 hashes, it is equally applicable to any hashing convention. ### Output Description A list of hashes and the different executab