Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
8 followers9,573 downloads10,241 copies160 likes55,491 views
8,655 detections
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Flags Intune assignments to “All Devices” or “All Users,” which attackers may abuse for mass deployment.
Detects execution of CRYPTBASE.dll from non‑system directories, a technique used in the STX RAT campaign to hijack legitimate installers (e.g., CPUID HWMonitor, X‑VPN).
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.
Identifies PowerShell executing scripts or expressions from the ProgramData directory, which may indicate malicious staging or backdoor execution. This rule specifically looks for PowerShell processes where the command line includes 'C:\ProgramData\' and also contains keywords like 'IEX', 'Invoke-Expression', or '.ps1', suggesting the execution of a script or expression.
Detects Hero proxyware artifacts being written or modified within the Windows SysWOW64 directory. Presence of these files may indicate installation of unauthorized proxy services or abuse of enterprise endpoints for traffic relaying.
Monitors for systems communicating with trycloudflare.com infrastructure, which may indicate creation or use of temporary Cloudflare tunnels capable of bypassing traditional remote access controls.
Identifies ScreenConnect client service execution initiated by trusted system processes (dfsvc.exe, services.exe) while referencing suspicious top-level domains (.top, .info, .site, .tk, .xyz, .pw, .ml, .club, .cf, ws) in the command line. This activity may indicate unauthorized remote access deployment or abuse of legitimate remote access tools.
Detects PowerShell commands using XOR operations together with execution primitives that may indicate obfuscated in-memory payload decoding. Specifically looks for 'powershell.exe' executing with '-bxor', '81', and either 'IEX' or 'Invoke-Expression' in the command line.
Identifies mshta.exe accessing externally hosted HTA content from a user-initiated Explorer session, potentially indicating malicious remote code execution.
Detects excessive caret (^) escaping in command lines, a common obfuscation technique used by attackers to evade detection and conceal malicious commands. The rule specifically looks for command-line executions by cmd.exe, powershell.exe, or pwsh.exe that contain more than 5 caret characters and a pattern of at least three alphanumeric characters immediately followed by a caret.
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