Sigma Rules
18 rules found for "@ionsor"
Number Of Resource Creation Or Deployment Activities
Number of VM creations or deployment activities occur in Azure via the azureactivity log.
Disabled MFA to Bypass Authentication Mechanisms
Detection for when multi factor authentication has been disabled, which might indicate a malicious activity to bypass authentication mechanisms.
New Federated Domain Added - Exchange
Detects the addition of a new Federated Domain.
Special File Creation via Mknod Syscall
Detects usage of the `mknod` syscall to create special files (e.g., character or block devices). Attackers or malware might use `mknod` to create fake devices, interact with kernel interfaces, or establish covert channels in Linux systems. Monitoring the use of `mknod` is important because this syscall is rarely used by legitimate applications, and it can be abused to bypass file system restrictions or create backdoors.
PSExec and WMI Process Creations Block
Detects blocking of process creations originating from PSExec and WMI commands
Windows Defender Exploit Guard Tamper
Detects when someone is adding or removing applications or folders from exploit guard "ProtectedFolders" or "AllowedApplications"
Outlook EnableUnsafeClientMailRules Setting Enabled
Detects an attacker trying to enable the outlook security setting "EnableUnsafeClientMailRules" which allows outlook to run applications or execute macros
System Language Discovery via Reg.Exe
Detects the usage of Reg.Exe to query system language settings. Attackers may discover the system language to determine the geographic location of victims, customize payloads for specific regions, or avoid targeting certain locales to evade detection.
Suspicious Schtasks Schedule Types
Detects scheduled task creations or modification on a suspicious schedule type
Suspicious Schtasks Schedule Type With High Privileges
Detects scheduled task creations or modification to be run with high privileges on a suspicious schedule type
WSL Child Process Anomaly
Detects uncommon or suspicious child processes spawning from a WSL process. This could indicate an attempt to evade parent/child relationship detections or persistence attempts via cron using WSL
Windows Defender Threat Severity Default Action Modified
Detects modifications or creations of Windows Defender's default threat action settings based on severity to 'allow' or take 'no action'. This is a highly suspicious configuration change that effectively disables Defender's ability to automatically mitigate threats of a certain severity level, allowing malicious software to run unimpeded. An attacker might use this technique to bypass defenses before executing payloads.
Outlook EnableUnsafeClientMailRules Setting Enabled - Registry
Detects an attacker trying to enable the outlook security setting "EnableUnsafeClientMailRules" which allows outlook to run applications or execute macros
Old TLS1.0/TLS1.1 Protocol Version Enabled
Detects applications or users re-enabling old TLS versions by setting the "Enabled" value to "1" for the "Protocols" registry key.
Winget Admin Settings Modification
Detects changes to the AppInstaller (winget) admin settings. Such as enabling local manifest installations or disabling installer hash checks
Azure Sign-In With Axios User Agent
Detects sign-in attempts in Azure/Entra ID logs where the user agent contains "axios", indicating potential use of automated credential harvesting or AiTM phishing infrastructure. Axios is a Node.js HTTP client abused to intercept and replay stolen credentials and MFA tokens. When triaging results, analysts should: - Check the sign-in risk level, MFA status, and conditional access results for signs of bypass. - Look for sign-ins from unusual locations or IPs, especially if the same IP targets multiple accounts. - Prioritize successful sign-ins over failed ones, as they may indicate a completed credential replay or AiTM attack.
WerFaultSecure Loading DbgCore or DbgHelp - EDR-Freeze
Detects the loading of dbgcore.dll or dbghelp.dll by WerFaultSecure.exe, which has been observed in EDR-Freeze attacks to suspend processes and evade detection. However, this behavior has also been observed during normal software installations, so further investigation is required to confirm malicious activity. When threat hunting, look for this activity in conjunction with other suspicious processes starting, network connections, or file modifications that occur shortly after the DLL load. Pay special attention to timing - if other malicious activities occur during or immediately after this library loading, it may indicate EDR evasion attempts. Also correlate with any EDR/AV process suspension events or gaps in security monitoring during the timeframe.
Remote Access Tool - ScreenConnect Remote Command Execution - Hunting
Detects remote binary or command execution via the ScreenConnect Service. Use this rule in order to hunt for potentially anomalous executions originating from ScreenConnect