Ibrahim Saud
@tektrixIndiaCompletionist
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Detects in-memory shellcode execution chains associated with BeepRAT and DcRAT. This includes the use of TCC (Tiny C Compiler) with specific flags for in-memory execution and LuaJIT FFI calls used to invoke Windows kernel functions (VirtualAlloc/CreateThread) for shellcode injection.
This rule detects the exploitation of CVE-2026-48558, a critical OIDC authentication bypass vulnerability in SimpleHelp. The detection logic correlates log events for 'Registering technician login' involving 'New Anon' sessions with subsequent configuration save requests occurring within 30 seconds. This pattern signifies the unauthorized creation of a privileged technician account by an unauthenticated attacker, bypassing standard identity verification.
Detects spear-phishing emails associated with UNC1549, utilizing malicious career-themed lures. The rule identifies emails containing specific lookalike domain patterns related to Boeing, Airbus, or Teledyne FLIR, and correlates these with common recruitment-themed email subjects, HR-spoofing sender strings, or the presence of common compressed file attachments (ZIP, RAR, 7Z, ISO).
Detects the execution of PowerShell with flags indicating encoded commands (-enc) or hidden window styles (-windowstyle hidden), which are common techniques used to obfuscate malicious activity or run payloads stealthily. This behavior is often associated with the post-compromise execution phase of various threats, including payloads delivered via malicious portals.
Detects attempts to clear Windows Event Logs using either the command-line utility 'wevtutil.exe' or the PowerShell cmdlet 'Clear-EventLog'. Additionally, it monitors for Windows Security Event ID 1102, which specifically indicates the clearing of the Security log. These actions are common indicators of an adversary attempting to remove evidence of their activity from a host system.
This rule detects potential phishing activity by correlating emails containing links to a specific suspicious domain and path with network activity (DNS queries or direct network connections) to the same domain. It targets both the initial email delivery and subsequent user interaction (e.g., clicking the link or downloading files).
This rule detects instances where the Microsoft Defender process (MsMpEng.exe) spawns common command-line or scripting interpreters such as cmd, powershell, or wscript with System integrity. This behavior is highly irregular for a security product and may indicate process injection, defensive evasion, or malicious activity masquerading as a legitimate system process.
Detects instances where wermgr.exe, typically used for Windows Error Reporting (WER), spawns interactive command-line interfaces such as cmd.exe, powershell.exe, or others. This behavior is indicative of exploitation (such as CVE-2026-50656) where an attacker has redirected a scheduled task to execute malicious code under SYSTEM integrity, masquerading as the wermgr.exe process.
Detects the creation of specific staging directories prefixed with 'RP_' in user temporary directories, containing 'System32' or 'wdtest_temp' subdirectories. This pattern is characteristic of an NTFS junction swap exploitation technique used to target Windows Defender quarantine artifact placement as part of the CVE-2026-50656 vulnerability.
Detects indicators of exploitation attempts against the CVE-2026-55200 libssh2 heap out-of-bounds write vulnerability. The rule identifies the creation of known PoC artifacts on disk, execution of exploit harnesses or probe binaries, Python scripts masquerading as or interacting with the PoC server, and libssh2-dependent client applications making network connections to the non-standard port 2222 used by the exploit scaffold.
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