Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
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This rule detects multiple failed sign-in attempts using the 'Device Code' authentication flow from various IP addresses or locations for a single user. This behavior can indicate an adversary attempting to bypass multi-factor authentication (MFA) or gain unauthorized access through device code phishing or brute-force attacks against the device code flow. The rule specifically looks for more than 3 attempts from more than 2 distinct IP addresses or locations, targeting common Microsoft applications like Office, Teams, Azure Portal, or Graph.
This rule identifies an anomalous surge in network connection attempts to a particular remote IP address. It establishes a baseline of average daily connection counts to each remote IP over the past week. It then compares the current hourly connection count to this baseline, triggering an alert if the current count is more than five times the baseline and surpasses a total of 500 connections within that hour. This could indicate various malicious activities such as data exfiltration, command and control communication, or a denial-of-service attack originating from the monitored environment.
Detects when a Network Security Group (NSG) rule is successfully deleted in Azure. This could indicate an attempt to bypass network access controls, potentially to enable unauthorized access or exfiltration.
This rule detects attempts to access or exfiltrate DPAPI (Data Protection API) credentials stored in the 'CREDHIST' folder. Specifically, it looks for file events within the `\Microsoft\Protect\CREDHIST` folder where the initiating process is either `dpapisnoop.exe` or `powershell.exe`. `dpapisnoop.exe` is a known tool for DPAPI credential extraction, and PowerShell can also be used for similar purposes.
Detects PowerShell commands that reverse byte arrays before dynamically loading assemblies into memory, a behavior commonly associated with advanced malware loaders and fileless execution techniques. The rule specifically looks for PowerShell process command lines containing 'IO.File', 'System.Reflection.Assembly', 'Length-1', and '..0', which are indicative of byte array manipulation and in-memory assembly loading.
This rule detects an unusually high volume (10 or more within an hour) of successful access control or role-related operations initiated by a single caller in Azure Activity logs. Such activity could indicate an adversary attempting to enumerate permissions, escalate privileges, or modify access to resources within an Azure environment.
This rule detects when a single caller performs five or more successful 'Create or Update Network Security Group' operations within a one-hour window in Azure Activity logs. This could indicate an attacker attempting to modify network access controls to facilitate lateral movement, C2, or data exfiltration, or a misconfigured automated process.
This rule detects multiple attempts (10 or more within an hour) from a single IP address to access administrative interfaces on a web server. It specifically looks for URI queries containing keywords like 'admin', 'wp-admin', or 'administrator' in W3CIISLog data. Such activity often indicates a brute-force attack or scanning for administrative login pages.
This rule detects repeated execution of 'maven' or 'gradle' commands on a system within a one-hour window. A high count (5 or more) of these commands from the same account on the same computer within an hour could indicate unusual development activity, automated build processes, or potentially malicious activity related to software supply chain compromise or development environment abuse.
This rule detects an unusually high number of executable (.exe or .msi) file creations within common installation or binary folders (containing 'setup', 'install', or 'bin' in their path) by a single process within a one-hour window. This behavior could indicate the staging or unpacking of malicious software, or a legitimate but potentially suspicious installation activity.
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