Ibrahim Saud
@tektrixIndiaCompletionist
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Detects outbound network connections from Citrix NetScaler appliances that exhibit high periodic regularity (beaconing behavior) towards rare external destinations. This pattern is indicative of potential command and control (C2) communication, possibly following the exploitation of vulnerabilities like CVE-2026-88771/88772.
Detects the execution of '1.bat' when it invokes administrative or sensitive utilities such as schtasks.exe, reg.exe, or specific executables like LockScreenContentServer.exe. This activity is indicative of a persistence mechanism being established or the initiation of a DLL side-loading chain.
Detects a suspicious Microsoft Teams MSI installer (msiexec.exe) spawning a PowerShell child process or referencing a known dead-drop resolver domain. This behavior is indicative of a trojanized installer used as an initial access vector to execute malicious payloads.
Detects PowerShell command execution that combines typical Active Directory or system reconnaissance commands with potential persistence mechanisms, which is a common indicator of post-exploitation activity.
Detects changes to Entra ID Conditional Access policies that degrade security posture. This includes deleting a policy, disabling an enabled policy, removing grant controls (like MFA requirements), expanding trusted location/IP ranges, or adding user/group/role exclusions. Such activities are indicative of an attacker attempting to weaken authentication and security enforcement to maintain persistent access or facilitate further lateral movement.
Detects modifications to domain federation settings in Microsoft Entra ID (formerly Azure AD) where a domain is converted from a managed authentication state to a federated authentication state. This type of configuration change is often used by adversaries to establish persistence or facilitate domain-level identity deception.
This rule detects potentially compromised accounts by correlating suspicious authentication activity (such as risky sign-ins, impossible travel, or malicious OAuth/Mail-rule configurations) with a subsequent spike in SharePoint or OneDrive file access, downloads, or external link sharing within a one-hour window. This behavior is indicative of an adversary performing cloud-based data exfiltration after gaining unauthorized access to an account.
Detects the use of legitimate archival utilities (such as 7-Zip, WinRAR, tar) or scripting engines (PowerShell) to compress or package sensitive browser profile artifacts like 'Login Data', 'Cookies', or 'Local State'. This behavior is a common indicator of credential harvesting and data staging activity by infostealers prior to exfiltration.
This rule detects typical behavior associated with infostealers targeting browser data, specifically the creation of compressed archives (.zip, .rar) in temporary directories (Temp or AppData) and the subsequent exfiltration of data via known webhook services (e.g., Discord, Telegram, Pastebin) or direct IP connections. It filters out common signed backup and synchronization software to minimize noise.
Detects network connections or DNS resolutions to known anonymous file-sharing, cloud storage, and messaging-bot API endpoints (e.g., transfer.sh, Telegram Bot API, Discord CDN) commonly abused by adversaries for data staging and exfiltration. This rule specifically targets non-browser processes that attempt to communicate with these endpoints, helping identify potentially malicious exfiltration activities.
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