Query: detect Detects suspicious use of an .exe extension after a non-executable file extension like .pdf.exe, a set of spaces or unde in logs
Matching passage: Sigma rule: Detects suspicious use of an .exe extension after a non-executable file extension like .pdf.exe, a set of spaces or unde. Logsource: windows / process_creation. Rule: title: Suspicious Double Extension File Execution id: 1cdd9a09-06c9-4769-99ff-626e2b3991b8 related: - id: 5e6a80c8-2d45-4633-9ef4-fa2671a39c5c type: similar status: stable description: Detects suspicious use of an .exe extension after a non-executable file extension like .pdf.exe, a set of spaces or underlines to cloak the executable file in spear phishing campaigns references: - https://blu3-team.blogspot.com/2019/06/misleading-extensions-xlsexe-docexe.html - https://twitter.com/blackorbird/status/1140519090961825792 - https://cloud.google.com/blog/topics/threat-intelligence/cybercriminals-weaponize-fake-ai-websites author: Florian Roth (Nextron Systems), @blu3_team (idea), Nasreddine Bencherchali (Nextron Systems) date: 2019-06-26 modified: 2025-05-30 tags: - attack.initial-access - attack.t1566.001 logsource: category: process_creation product: windows detection: selection: Image|endswith: - ' .exe' - ______.exe - .doc.exe - .doc.js - .docx.exe - .docx.js - .gif.exe - .jpeg.exe - .jpg.exe - .mkv.exe - .mov.exe - .mp3.exe - .mp4.exe - .pdf.exe - .pdf.js - .png.exe - .ppt.exe - .ppt.js - .pptx.exe - .pptx.js - .rtf.exe - .rtf.js - .svg.exe - .txt.exe - .txt.js - .xls.exe - .xls.js - .xlsx.exe - .xlsx.js - ⠀⠀⠀⠀⠀⠀.exe CommandLine|contains: - ' .exe' - ______.exe - .doc.exe - .doc.js - .docx.exe - .docx.js - .gif.exe - .jpeg.exe - .jpg.exe - .mkv.exe - .mov.exe - .mp3.exe - .mp4.exe - .pdf.exe - .pdf.js - .png.exe - .ppt.exe - .ppt.js - .pptx.exe - .pptx.js - .rtf.exe - .rtf.js - .svg.exe - .txt.exe - .txt.js - .xls.exe - .xls.js - .xlsx.exe - .xlsx.js - ⠀⠀⠀⠀⠀⠀.exe condition: selection falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, Amm. Logsource: windows / process_creation. Rule: title: Remote Access Tool - UltraViewer Execution id: 88656cec-6c3b-487c-82c0-f73ebb805503 status: test description: 'An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land) ' references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1219/T1219.md author: frack113 date: 2022-09-25 modified: 2024-03-14 tags: - attack.command-and-control - attack.t1219.002 logsource: category: process_creation product: windows detection: selection: - Product: UltraViewer - Company: DucFabulous Co,ltd - OriginalFileName: UltraViewer_Desktop.exe condition: selection falsepositives: - Legitimate use level: medium