Sigma Rules
1,585 rules found for "defense-evasion"
Scheduled Task Creation Masquerading as System Processes
Detects the creation of scheduled tasks that involve system processes, which may indicate malicious actors masquerading as or abusing these processes to execute payloads or maintain persistence.
Sdclt Child Processes
A General detection for sdclt spawning new processes. This could be an indicator of sdclt being used for bypass UAC techniques.
Sdiagnhost Calling Suspicious Child Process
Detects sdiagnhost.exe calling a suspicious child process (e.g. used in exploits for Follina / CVE-2022-30190)
Potential Suspicious Activity Using SeCEdit
Detects potential suspicious behaviour using secedit.exe. Such as exporting or modifying the security policy
Uncommon Child Process Of Setres.EXE
Detects uncommon child process of Setres.EXE. Setres.EXE is a Windows server only process and tool that can be used to set the screen resolution. It can potentially be abused in order to launch any arbitrary file with a name containing the word "choice" from the current execution path.
Setup16.EXE Execution With Custom .Lst File
Detects the execution of "Setup16.EXE" and old installation utility with a custom ".lst" file. These ".lst" file can contain references to external program that "Setup16.EXE" will execute. Attackers and adversaries might leverage this as a living of the land utility.
Uncommon Sigverif.EXE Child Process
Detects uncommon child processes spawning from "sigverif.exe", which could indicate potential abuse of the latter as a living of the land binary in order to proxy execution.
Suspicious Speech Runtime Binary Child Process
Detects suspicious Speech Runtime Binary Execution by monitoring its child processes. Child processes spawned by SpeechRuntime.exe could indicate an attempt for lateral movement via COM & DCOM hijacking.
Suspicious Splwow64 Without Params
Detects suspicious Splwow64.exe process without any command line parameters
Arbitrary File Download Via Squirrel.EXE
Detects the usage of the "Squirrel.exe" to download arbitrary files. This binary is part of multiple Electron based software installations (Slack, Teams, Discord, etc.)
Process Proxy Execution Via Squirrel.EXE
Detects the usage of the "Squirrel.exe" binary to execute arbitrary processes. This binary is part of multiple Electron based software installations (Slack, Teams, Discord, etc.)
Program Executed Using Proxy/Local Command Via SSH.EXE
Detect usage of the "ssh.exe" binary as a proxy to launch other programs.
Execution via stordiag.exe
Detects the use of stordiag.exe to execute schtasks.exe systeminfo.exe and fltmc.exe
Start of NT Virtual DOS Machine
Ntvdm.exe allows the execution of 16-bit Windows applications on 32-bit Windows operating systems, as well as the execution of both 16-bit and 32-bit DOS applications
Abused Debug Privilege by Arbitrary Parent Processes
Detection of unusual child processes by different system processes
Execute From Alternate Data Streams
Detects execution from an Alternate Data Stream (ADS). Adversaries may use NTFS file attributes to hide their malicious data in order to evade detection
Always Install Elevated Windows Installer
Detects Windows Installer service (msiexec.exe) trying to install MSI packages with SYSTEM privilege
Potentially Suspicious Windows App Activity
Detects potentially suspicious child process of applications launched from inside the WindowsApps directory. This could be a sign of a rogue ".appx" package installation/execution
Bad Opsec Defaults Sacrificial Processes With Improper Arguments
Detects attackers using tooling with bad opsec defaults. E.g. spawning a sacrificial process to inject a capability into the process without taking into account how the process is normally run. One trivial example of this is using rundll32.exe without arguments as a sacrificial process (default in CS, now highlighted by c2lint), running WerFault without arguments (Kraken - credit am0nsec), and other examples.
Suspicious Child Process Created as System
Detection of child processes spawned with SYSTEM privileges by parents with LOCAL SERVICE or NETWORK SERVICE accounts
Potential Commandline Obfuscation Using Escape Characters
Detects potential commandline obfuscation using known escape characters
Potential CommandLine Obfuscation Using Unicode Characters From Suspicious Image
Detects potential commandline obfuscation using unicode characters. Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit.
Suspicious Explorer Process with Whitespace Padding - ClickFix/FileFix
Detects process creation with suspicious whitespace padding followed by a '#' character, which may indicate ClickFix or FileFix techniques used to conceal malicious commands from visual inspection. ClickFix and FileFix are social engineering attack techniques where adversaries distribute phishing documents or malicious links that deceive users into opening the Windows Run dialog box or File Explorer search bar. The victims are then instructed to paste commands from their clipboard, which contain extensive whitespace padding using various Unicode space characters to push the actual malicious command far to the right, effectively hiding it from immediate view.
Suspicious Usage of For Loop with Recursive Directory Search in CMD
Detects suspicious usage of the cmd.exe 'for /f' loop combined with the 'tokens=' parameter and a recursive directory listing. This pattern may indicate an attempt to discover and execute system binaries dynamically, for example powershell, a technique sometimes used by attackers to evade detection. This behavior has been observed in various malicious lnk files.
Potential Command Line Path Traversal Evasion Attempt
Detects potential evasion or obfuscation attempts using bogus path traversal via the commandline
Suspicious Copy From or To System Directory
Detects a suspicious copy operation that tries to copy a program from system (System32, SysWOW64, WinSxS) directories to another on disk. Often used to move LOLBINs such as 'certutil' or 'desktopimgdownldr' to a different location with a different name in order to bypass detections based on locations.
LOL-Binary Copied From System Directory
Detects a suspicious copy operation that tries to copy a known LOLBIN from system (System32, SysWOW64, WinSxS) directories to another on disk in order to bypass detections based on locations.
Raccine Uninstall
Detects commands that indicate a Raccine removal from an end system. Raccine is a free ransomware protection tool.
Suspicious Parent Double Extension File Execution
Detect execution of suspicious double extension files in ParentCommandLine
DumpStack.log Defender Evasion
Detects the use of the filename DumpStack.log to evade Microsoft Defender
Always Install Elevated MSI Spawned Cmd And Powershell
Detects Windows Installer service (msiexec.exe) spawning "cmd" or "powershell"
Elevated System Shell Spawned From Uncommon Parent Location
Detects when a shell program such as the Windows command prompt or PowerShell is launched with system privileges from a uncommon parent location.
Potential Defense Evasion Activity Via Emoji Usage In CommandLine - 1
Detects the usage of emojis in the command line, this could be a sign of potential defense evasion activity.
Potential Defense Evasion Activity Via Emoji Usage In CommandLine - 2
Detects the usage of emojis in the command line, this could be a sign of potential defense evasion activity.
Potential Defense Evasion Activity Via Emoji Usage In CommandLine - 3
Detects the usage of emojis in the command line, this could be a sign of potential defense evasion activity.
Potential Defense Evasion Activity Via Emoji Usage In CommandLine - 4
Detects the usage of emojis in the command line, this could be a sign of potential defense evasion activity.
ETW Logging Tamper In .NET Processes Via CommandLine
Detects changes to environment variables related to ETW logging via the CommandLine. This could indicate potential adversaries stopping ETW providers recording loaded .NET assemblies.
ETW Trace Evasion Activity
Detects command line activity that tries to clear or disable any ETW trace log which could be a sign of logging evasion.
Suspicious Eventlog Clearing or Configuration Change Activity
Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic". This technique were seen used by threat actors and ransomware strains in order to evade defenses.
Potentially Suspicious Execution From Parent Process In Public Folder
Detects a potentially suspicious execution of a parent process located in the "\Users\Public" folder executing a child process containing references to shell or scripting binaries and commandlines.
Process Execution From A Potentially Suspicious Folder
Detects a potentially suspicious execution from an uncommon folder.
Potential Hidden Directory Creation Via NTFS INDEX_ALLOCATION Stream - CLI
Detects command line containing reference to the "::$index_allocation" stream, which can be used as a technique to prevent access to folders or files from tooling such as "explorer.exe" or "powershell.exe"
Writing Of Malicious Files To The Fonts Folder
Monitors for the hiding possible malicious files in the C:\Windows\Fonts\ location. This folder doesn't require admin privillege to be written and executed from.
Potential Homoglyph Attack Using Lookalike Characters
Detects the presence of unicode characters which are homoglyphs, or identical in appearance, to ASCII letter characters. This is used as an obfuscation and masquerading techniques. Only "perfect" homoglyphs are included; these are characters that are indistinguishable from ASCII characters and thus may make excellent candidates for homoglyph attack characters.
Execution Of Non-Existing File
Checks whether the image specified in a process creation event is not a full, absolute path (caused by process ghosting or other unorthodox methods to start a process)
LOLBIN Execution From Abnormal Drive
Detects LOLBINs executing from an abnormal or uncommon drive such as a mounted ISO.
Potential File Download Via MS-AppInstaller Protocol Handler
Detects usage of the "ms-appinstaller" protocol handler via command line to potentially download arbitrary files via AppInstaller.EXE The downloaded files are temporarly stored in ":\Users\%username%\AppData\Local\Packages\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\AC\INetCache\<RANDOM-8-CHAR-DIRECTORY>"
Process Launched Without Image Name
Detect the use of processes with no name (".exe"), which can be used to evade Image-based detections.