Daniel Jeremiah
@daniyyellUnited KingdomTrusted contributorCompletionist
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978 detections
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Targets creation or loading of a .sys file from the Fonts directory by a non-standard loader. The UDM rule retains principal and target context for correlation.
This rule detects PowerShell processes attempting to retrieve or execute content from a remote RTF (Rich Text Format) resource. It specifically looks for PowerShell commands like 'Invoke-WebRequest', 'iwr', 'DownloadString', 'Invoke-Expression', or 'iex' that are directed towards a URL ending with '.rtf'. This behavior is often associated with malicious activity where RTF files are used as a delivery mechanism for scripts.
This rule detects the execution of self-extracting (SFX) archives that launch both a visible decoy and a hidden second executable from the temporary directory. It specifically looks for process command lines containing patterns indicative of 7-zip or generic SFX archive execution, combined with an actor process image name suggesting an archive utility or installer. The rule aims to identify malicious SFX archives used in multi-stage attacks, providing causality fields for investigation.
Affair-Build Script Restarting VDS
Cortex XDR
This rule detects the execution of `cmd.exe`, `powershell.exe`, or `pwsh.exe` that includes the command-line arguments related to an 'affair-build.bat' script or directly stopping/starting the Virtual Disk Service (VDS) using `net` or `sc` commands. It aims to identify cleanup or persistence script sequences that manipulate the VDS.
Detects schtasks creating a one-time task on another host using supplied credentials and a batch file under Windows Temp, executed as SYSTEM. This behavior is indicative of an adversary establishing persistence or lateral movement by scheduling malicious code to run with high privileges on a remote system.
Detects a non-Discord process preparing multipart attachment data from a local path for upload through a messaging API. This behavior is indicative of malware like EchoCreep exfiltrating data via messaging platforms.
Detects a custom proxy process listening for forwarding instructions and creating a second outbound connection to a supplied host and service. This rule specifically looks for network events where the process image name contains 'chainworm', 'svc', or 'proxy' (case-insensitive) and the command line arguments indicate forwarding or connection establishment activities like 'forward', 'next hop', 'bind', 'listen', 'reconnect', or 'TcpClient'.
NSIS InetLoad downloader user agent
Cortex XDR
This rule detects the distinctive 'NSIS_InetLoad Mozilla' user-agent string, which is commonly used by staged downloaders. It specifically targets network events where the process image name ends with '.exe' and either the event subtype or the remote IP contains the 'NSIS_InetLoad Mozilla' string. The rule aims to identify the initial stages of malware delivery and execution, providing causality fields for investigation.
This rule detects the registration of a Windows service named 'msidiskserver' or a service whose ImagePath ends with 'fsdiskbit.sys'. This activity is associated with the 'FISHMONGERS' threat actor group and their 'SprySocks' malware, which uses a transient driver for persistence. The rule focuses on registry events related to service creation or modification.
SYSTEM-Context PST or OST Collection
Cortex XDR
This rule detects suspicious access to Outlook data files (.pst or .ost) by processes running in the SYSTEM context, excluding legitimate Outlook-related processes. It focuses on identifying non-standard applications or scripts attempting to collect mailbox data, potentially indicating data exfiltration or unauthorized access. The rule leverages causality fields for enhanced investigation.
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