Ibrahim Saud
@tektrixIndiaCompletionist
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This rule detects suspicious PowerShell activity involving the enumeration and manipulation of COM objects and .NET assemblies, patterns often associated with reconnaissance or post-exploitation activities. It flags instances where PowerShell scripts utilize specific command-line arguments (e.g., Get-ComDatabase, Get-ComClass, Import-Win32Module, NtObjectManager) in conjunction, suggesting automated discovery of COM infrastructure or assembly loading.
Detects non-browser processes accessing sensitive browser credential stores (e.g., Login Data, Cookies) and cryptocurrency wallet files within a short time window. This pattern is characteristic of infostealer malware like Vidar, which grabs browser and wallet data for exfiltration.
Detects web browser processes (Chrome, Edge, Firefox, Brave, Opera, IE) being spawned by a parent process that is not part of the standard, trusted application launch lineage. This pattern is commonly observed in credential-stealing malware like Vidar Stealer, which invokes browsers to access and exfiltrate stored browser data.
Detects the use of OleViewDotNet or NtObjectManager PowerShell tools to enumerate running COM host processes (e.g., dllhost.exe) and check for the absence of specific security mitigations like EOAC_NO_CUSTOM_MARSHAL or COMGLB_UNMARSHALING_POLICY_STRONG. This behavior is indicative of reconnaissance activity aimed at identifying targets for fake-marshaled CoGetInstanceFromIStorage exploit chains.
Detects the custom ARX-based stream cipher used by Vidar Stealer (v2.2+) to encrypt strings and configuration data. The rule identifies the presence of specific FNV-1a and golden-ratio constants used for state initialization, in combination with unique, per-build keystream constants observed in recent variants.
Detects the presence of known Vidar Stealer malware binaries (internal build versions 2.0 through 3.4) by matching their SHA256 file hashes. Vidar is an infostealer malware typically used to exfiltrate sensitive data from victim systems.
Detects the presence of a specific Russian-language error string ("Не удалось сгенерировать HWID") within binary files, which is characteristic of the HWID generation mechanism used by Vidar Stealer malware.
Detects HTTP POST requests directed at etherscan.io containing 'eth_call' in the request body. This pattern is indicative of the GHAPPIER / PolinRider malware family utilizing the Ethereum blockchain's public JSON-RPC interface as a dead-drop resolver for command-and-control communication.
Detects in-memory modification of the AmsiScanBuffer function within PowerShell processes, specifically targeting the injection of patch instructions (e.g., MOV EAX, 80070057; RET). This technique is characteristic of .NET loaders like PIVOTPIPE attempting to bypass Antimalware Scan Interface (AMSI) inspection before executing malicious payloads.
Detects the presence of PIVOTPIPE .NET loader components within files by searching for specific magic bytes, debug strings, hardcoded developer file paths, and agent-related operational strings.
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