Technical Breakdown: CryptoDefense (a CryptoLocker off-shoot) 1. File Extension & Renaming Patterns Primary Extension in Use: .CRYPTO Additional aliases occasionally reported: .CRYPTODEFENSE (first June 2014 builds) Renaming Convention: It replaces the last existing extension with .CRYPTO, keeping the original file name unchanged. Example: Quarterly_Report_Q2.xlsx → Quarterly_Report_Q2.xlsx.CRYPTO Hidden/system files are not skipped, so boot-payloads like hibernation…

Technical Breakdown: 1. File Extension & Renaming Patterns Confirmation of File Extension: cryptodarkrubix always appends the fixed string “.cryptodarkrubix” (all lowercase, no spaces) to the original file extension. Example: Report FY24.xlsx → Report FY24.xlsx.cryptodarkrubix photo.jpg → photo.jpg.cryptodarkrubix Renaming Convention: Original file name and extension remain intact and are ―only― preceded by the appended .cryptodarkrubix; no…

Below is a consolidated, up-to-date dossier compiled from public incident data, private DFIR reports, CERT-TA advisories and in-house reverse engineering. Feel free to redistribute under CC-BY-NC-SA with attribution. Technical Breakdown 1. File Extension & Renaming Patterns File Extension: .cryptobyte (exact byte sequence 0x630072007900700074006F0062007900740065 or ASCII “cryptobyte”) is appended to every encrypted regular file. Renaming Convention:…

CryptoBoss Ransomware – Comprehensive Defensive & Recovery Guide Last revised: 2024-05-21 Technical Breakdown 1. File Extension & Renaming Patterns Confirmation of File Extension: .cryptoBOSS Renaming Convention: Once encryption is complete CryptoBoss prepends the original filename with [random-a-z0-9]{6}- followed by the original extension, then appends .cryptoBOSS. Example before → after: Project_Q3.xlsx → 3d8f9e-Project_Q3.xlsx.cryptoBOSS A file list…

Technical Breakdown ──────────────────────────────────── File Extension & Renaming Patterns • Confirmation of File Extension crypto_crypt appends “.crypto_crypt” to every affected file. • Renaming Convention Original files follow the pattern original.name.ext.crypto_crypt (e.g., Holiday_Pics.jpg.crypto_crypt). No additional random strings, counter values, or hexadecimal tokens are inserted, making the extension unusually concise compared with other major families. Detection & Outbreak Timeline •…

Technical Breakdown: 1. File Extension & Renaming Patterns Confirmation of File Extension: Crypto24 appends the string .crypto24 to every encrypted file (e.g., report.xlsx becomes report.xlsx.crypto24). Renaming Convention: The ransomware does not change the root file name or move files into new directories, but it inserts the hostname as an AES-256 encrypted blob inside each encrypted…

CRYPTO1317 RANSOMWARE – COMMUNITY BRIEFING Technical Breakdown 1. File Extension & Renaming Patterns Confirmation of File Extension: .crypto1317 Renaming Convention: – The original filename remains intact; only the extension is appended without a delimiter. Example: Budget.xlsx becomes Budget.xlsx.crypto1317 – Only the last 48 bytes of every attacked file are overwritten (partial encryption), causing anyfile.crypto1317 to…

Technical Breakdown: 1. File Extension & Renaming Patterns Confirmation of File Extension: The ransomware appends the literal suffix “.crypto*” (including the asterisk) to the original filename, e.g., AnnualReport.odt.crypto* or 2024-05-Accounting.xlsx.crypto*. Renaming Convention: – Each encrypted file retains its original directory path; no folder structures are relocated. – Victims who rename files back to the former…

Crypto Ransomware Threat Report (extension “.crypto” observed in-the-wild) Technical Breakdown 1. File Extension & Renaming Patterns • Exact extension used: .crypto (lower-case) • Renaming convention: – Word.doc → Word.doc.crypto – Excel.xlsx → Excel.xlsx.crypto Older samples (2015-2016 era) sometimes appended a 6-character hexadecimal identifier before the extension (e.g., Word.doc.B8E9D5.crypto), but contemporary campaigns drop the ID and…

Technical Breakdown: CRYPTN8 Ransomware 1. File Extension & Renaming Patterns Confirmation of File Extension: .cryptn8 (always lower-case, exactly seven characters including the dot). Renaming Convention: Victim’s original file name and extension are first transformed to UPPER-CASE. Example: Quarterly_report_Q3.docx → QUARTERLY_REPORT_Q3.DOCX.cryptn8 If the file path or name is longer than 12 characters, the ransomware creates an…