Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
7 followers9,573 downloads10,250 copies160 likes55,609 views
8,655 detections
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Detects attempts to delete Volume Shadow Copies (VSS) using standard Windows utilities like vssadmin.exe, wmic.exe, or PowerShell commands. This behavior is a common tactic employed by ransomware to inhibit system recovery and prevent the restoration of encrypted files.
Detects the creation of scheduled tasks (schtasks.exe) spawned by common scripting or social engineering-related parent processes (PowerShell, Cmd, WScript, MSHTA). The rule specifically looks for payloads associated with common attack patterns, such as downloading remote content or executing encoded commands, which indicates potential persistence or payload delivery activities.
This rule identifies potential ransomware activity by detecting a process performing a high volume of file rename or modification operations within a short time window. It specifically targets files with known ransomware extensions or those using randomized 6-8 character alphanumeric extensions, while excluding common administrative, backup, and temporary file operations performed by trusted software.
Detects attempts by unsigned or non-Microsoft processes to perform cross-process memory injection (such as CreateRemoteThread or NtCreateThreadEx) into critical processes including browser processes (chrome.exe, msedge.exe) or the local security authority subsystem service (lsass.exe).
This rule detects attempts by unsigned or suspicious processes (often residing in temporary directories) to access sensitive cryptocurrency wallet files such as 'wallet.dat', keystore JSON files, and files containing recovery seed phrases. This behavior is indicative of credential theft commonly associated with infostealer campaigns like DeepLoad and DeerStealer.
Detects the use of certutil.exe to download files from a remote URL using the -urlcache or -split flags. This behavior is a common Living-off-the-Land (LotL) technique used by adversaries to bypass security controls and download secondary payloads.
Detects the execution of mshta.exe with arguments that indicate the loading of remote HTML applications (HTA) via HTTP/HTTPS, UNC paths, or the execution of inline JavaScript/VBScript commands. This behavior is a common technique used by attackers to proxy execution through a trusted Windows binary to bypass security controls or fetch malicious payloads.
Detects instances where a process not associated with a known web browser attempts to read sensitive browser credential stores (such as Chrome Login Data, Edge Login Data, or Firefox key4.db/logins.json). This behavior is characteristic of infostealers attempting to extract saved browser credentials.
Detects high-volume file renaming activity where the new file extensions correspond to common ransomware patterns (e.g., .locked, .encrypted, .wncry). The rule excludes processes signed by reputable vendors to reduce noise.
Detects instances where a signed process loads a dynamic-link library (DLL) from a user-writable directory, such as Temp, AppData, Downloads, or Public. This behavior is a common technique used for DLL sideloading to hijack the execution flow of trusted, signed applications.
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