Duo Tech
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2,481 detections
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Detects the execution of a PowerShell script named 'cap.ps1' using common obfuscation and evasion flags including '-windowstyle hidden' and '-executionpolicy bypass'. This pattern is frequently used by adversaries to execute malicious scripts while minimizing user visibility and bypassing standard security policy restrictions.
Detects PowerShell scripts that contain custom bit-reversal and XOR decoding routines used to deobfuscate an embedded byte blob, followed by the reflective loading of that blob into memory as a .NET assembly using [Reflection.Assembly]::Load. This behavior is associated with loaders like cap.ps1 used to deploy RATs such as AsyncRAT.
This rule detects network activity associated with a known malicious domain 'facture-in.pages.dev' or suspicious HTTP response patterns often observed in phishing kits or web-based redirection, such as 'BOT BLOCKED', 'no_mouse', 'wrong_timezone', or specific language-localized error messages.
Detects PNG image files that contain an embedded ZIP archive appended after the IEND chunk. This technique is commonly associated with Ousaban malware, which uses steganography to conceal malicious payloads (such as an executable named 'SysMain.exe') within image files to evade detection during delivery.
This rule detects outgoing HTTP POST requests that contain a payload matching the signature of Ousaban malware's custom XOR-encoded command-and-control (C2) traffic, characterized by a specific hexadecimal structure.
Detects a malicious PNG file used by the Ousaban VBS downloader that embeds a ZIP archive containing a payload named 'SysMain.exe' appended after the PNG IEND chunk.
Detects the execution of VBScript files (via wscript.exe or cscript.exe) where the parent process is a common web browser (Chrome, Firefox, Edge, or IE). This pattern is frequently indicative of a drive-by download or social engineering attack where a user is tricked into executing a malicious script originating from a web-based context.
Detects file creation or write operations involving file paths containing the string 'SysMain_5874288'. This pattern is often associated with adversary attempts to drop, stage, or modify files using names designed to masquerade as legitimate system components or services, potentially to maintain persistence or evade detection.
Detects the creation or writing of BMP files in temporary directories by processes other than common screenshot or image editing tools. This activity can be indicative of malware attempting to capture screenshots or other visual data, potentially for exfiltration or analysis.
Detects malicious Python or JavaScript package archives (such as those used in dependency confusion attacks) that contain obfuscated code execution logic (base64 encoded commands) within package installation hooks (setup.py), or those embedding suspicious binary executables (PE/ELF headers) within the package structure.
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