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Explore public detection logic contributed by the community across SIEM and rule languages.
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This query was originally published in the threat analytics report, Operation Soft Cell.
Operation Soft Cell is a series of campaigns targeting users' call logs at telecommunications providers throughout the world. These attacks date from as early as 2012.
Operation Soft Cell operators sometimes use legitimate web server processes to launch commands, especially for network discovery and user/owner discovery. The following query detects activity of this kind.
Reference - https://www.cybereason.com/blog/operation-soft-cell-a-worldwide-campaign-against-telecommunications-providers
Operation Soft Cell is a series of campaigns targeting users' call logs at telecommunications providers throughout the world. These attacks date from as early as 2012.
Operation Soft Cell operators sometimes use legitimate web server processes to launch commands, especially for network discovery and user/owner discovery. The following query detects activity of this kind.
Reference - https://www.cybereason.com/blog/operation-soft-cell-a-worldwide-campaign-against-telecommunications-providers
The following analytic detects attempts to stop a service on Linux systems. It leverages data from Linux Auditd. This activity is significant as adversaries often stop or terminate security or critical services to disable defenses or disrupt operations, as seen in malware like Industroyer2. If confirmed malicious, this could lead to the disabling of security mechanisms, allowing attackers to persist, escalate privileges, or deploy destructive payloads, severely impacting system integrity and availability.
The following analytic detects the suspicious auditd service stop. This behavior is critical for a SOC to monitor because it may indicate attempts to gain unauthorized access or maintain control over a system. Such actions could be signs of malicious activity. If confirmed, this could lead to serious consequences, including a compromised system, unauthorized access to sensitive data, or even a wider breach affecting the entire network. Detecting and responding to these signs early is essential to prevent potential security incidents.
The analytic detects cloud API calls executed by user roles that have not previously run these commands. It leverages the Change data model in Splunk to identify commands executed by users with the user_type of AssumedRole and a status of success. This activity is significant because new commands from different user roles can indicate potential malicious activity or unauthorized actions. If confirmed malicious, this behavior could lead to unauthorized access, data breaches, or other damaging outcomes by exploiting new or unmonitored commands within the cloud environment.
The analytic detects the creation of cloud compute instances using previously unseen image IDs. It leverages cloud infrastructure logs to identify new image IDs that have not been observed before. This activity is significant because it may indicate unauthorized or suspicious activity, such as the deployment of malicious payloads or unauthorized access to sensitive information. If confirmed malicious, this could lead to data breaches, unauthorized access, or further compromise of the cloud environment. Immediate investigation is required to determine the legitimacy of the instance creation and to mitigate potential threats.
Detects the usage of the "ConvertTo-SecureString" cmdlet via the command line within PowerShell or pwsh.exe processes. This activity is generally uncommon and could indicate suspicious behavior, as it is often used to handle sensitive information like passwords, which attackers might try to extract or manipulate.
Detects attempts to clear Windows Event Logs using 'wevtutil' command-line utility or PowerShell cmdlets like 'Remove-EventLog' and 'Clear-EventLog'. This activity is often performed by adversaries to remove forensic evidence of their actions on a compromised system.
This rule detects PowerShell commands that utilize encoded arguments such as '-enc', '-ec', or '-en'. Adversaries often use encoded PowerShell commands to obfuscate their malicious scripts, making it harder for security tools and analysts to detect and understand their activities. The rule specifically looks for the execution of 'powershell.exe' or 'powershell_ise.exe' with these encoding flags and attempts to capture and decode the obfuscated command.
Detects the installation and configuration of PowerShell Web Access, which could be used for remote access and potential abuse. The rule specifically looks for PowerShell script block text containing commands related to installing the Windows feature, installing the PSWA web application, and adding authorization rules.
Detects the use of the PowerShell cmdlet 'Get-StorageDiagnosticInfo' with the '-IncludeLiveDump' parameter to dump the live memory of a Windows machine. This technique can be used by adversaries to extract sensitive information, including credentials, from memory.
PowerShell Web Download
YARA-L
Detects suspicious ways to download files or content using PowerShell
Detects usage of the \"FromBase64String\" function in the commandline which is used to decode a base64 encoded string
Detects usage of the \"ConvertTo-SecureString\" cmdlet via the commandline. Which is fairly uncommon and could indicate potential suspicious activity
PowerShell DownloadFile
YARA-L
Detects the execution of powershell, a WebClient object creation and the invocation of DownloadFile in a single command line
Detects a suspicious call to Invoke-WebRequest cmdlet where the and output is located in a suspicious location
Detects the use of powershell to enumerate successful logins on a specific host
Detects usage of a PowerShell command to dump the live memory of a Windows machine
Detects the installation and configuration of PowerShell Web Access, which could be used for remote access and potential abuse
Detects encoded powershell commands
Detects the clearing of event logs within the Windows Event Viewer.
This rule detects the execution and usage of the DSInternals PowerShell module. DSInternals is a powerful tool that exposes internal features of Active Directory and Azure Active Directory, enabling actions such as dumping DPAPI backup keys, manipulating NTDS.DIT files, auditing FIDO2 and NGC keys, performing password auditing, and recovering Domain Controllers from IFM backups. The rule specifically looks for a wide range of DSInternals cmdlets being executed via the command line.
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