Technical Breakdown: 1. File Extension & Renaming Patterns Confirmation of File Extension: .fixt Renaming Convention: The malware concatenates “.fixt” to the original file name while preserving the original extension in the middle. Example: Quarterly-Report.xlsx ➔ Quarterly-Report.xlsx.fixt 2. Detection & Outbreak Timeline First public appearance: late-March 2022 (earliest submission to public sandbox 28 Mar 2022). Rapid…

Ransomware Briefing – “FIXED” Extension Updated: 2024-06-XX Technical Breakdown 1. File Extension & Renaming Patterns Confirmation of File Extension: .fixed (lower-case, no second marker). Renaming Convention: Prepends e-mail address + unique ID, appends the new extension. – Example: annual_report.xlsx → <ransom-email>_[<8-hex-victim-ID>].fixed (e.g., [email protected]_[A1B2C3D4].fixed). 2. Detection & Outbreak Timeline First public samples: 2023-11-18 (MalwareBazaar, ID-hash 0e25…).…

Ransomware Briefing – “.fix” (part of the Dharma/CEZOR family) TECHNICAL BREAKDOWN 1. File Extension & Renaming Patterns Identifying extension: .fix Full renaming convention: <original-filename>.<original-extension>.id-<8-hex-chars>.[<attacker-email>].fix Example: Project_budget.xlsx.id-4A7F2D91.[[email protected]].fix The e-mail address changes between campaigns (recoveryhelp@, fileservice@, datarestore@, etc.) 2. Detection & Outbreak Timeline First submitted samples: December 2020 via public sandboxes Surge periods: March–April 2021, September 2021,…

Ransomware Briefing – “.fisakalzb” (a.k.a. Fisakal Ransom) TECHNICAL BREAKDOWN 1. File Extension & Renaming Patterns Confirmed extension: .fisakalzb Renaming convention: [original name].[original ext].id-<8-hex-chars>.[attacker-email-1].attacker-email-2].fisakalzb Example: Project_Q3.xlsx → Project_Q3.xlsx.id-3F2A7B9C.[[email protected]].fisakalzb 2. Detection & Outbreak Timeline First submissions to ID-ransomware & VirusTotal: 06-Nov-2023 (cluster peaked 10–14 Nov 2023) Geo-tagging of early samples: Central-European MSPs and U.S. county-level governments Still…

{{ $json.extension }} (a.k.a. FIRSTKILL / firstKill) – Community Playbook Compiled by [Redacted – OPSEC], v1.0 – updated 30 Jun 2025 Technical Breakdown 1. File Extension & Renaming Patterns Confirmation of file extension: .firstkill (sometimes seen in lower-case .firstkill or dual extension .1stkill.firstkill on re-infection) Renaming convention: Example before encryption: 2024-Annual-Report.xlsx After encryption: 2024-Annual-Report.xlsx.firstkill –…

Ransomware Resource Sheet – “firmabilgileri” Technical Breakdown 1. File Extension & Renaming Patterns Confirmation of file extension: .firmabilgileri (lowercase, appended as a second extension) Renaming convention: Original file → <original_name>.<original_ext>.firmabilgileri Example: Annual_Report.xlsx → Annual_Report.xlsx.firmabilgileri In some runs the malware also drops the original filename completely and replaces it with an uppercase random string, e.g., KJ17B2A9.xlsx.firmabilgileri.…

FireX3M Ransomware – Community Threat Dossier Technical Breakdown 1. File Extension & Renaming Patterns Confirmation of File Extension: .firex3m (lower-case, appended as a secondary extension; original extension is preserved). Renaming Convention: <original-name>.<original-ext>.firex3m Example: Quarterly-Report.xlsx becomes Quarterly-Report.xlsx.firex3m. In v2.xx builds the Trojan also drops a hexadecimal “victim-ID” file (e.g., id-4A3C97FE.firex3m.key) in %ProgramData%. 2. Detection & Outbreak…

Technical Breakdown: 1. File Extension & Renaming Patterns Confirmation of File Extension: Files are appended with “.firecrypt” in lower-case, e.g. Budget_2024.xlsx → Budget_2024.xlsx.firecrypt Renaming Convention: Original file name is preserved in its entirety No e-mail address, random ID, or victim key is inserted—only the new suffix is added Directory where encryption occurs receives a marker…

Fire Ransomware (.fire) – Community Briefing Sheet Version 1.0 – Last reviewed 2024-06-XX TECHNICAL BREAKDOWN 1. File Extension & Renaming Patterns Confirmation of file extension: .fire (lowercase) is appended to every encrypted file. Renaming convention: Original → vacation2023.jpg → vacation2023.jpg.fire No e-mail address, random string, or secondary extension is placed in front; the original name…

Ransomware Brief – “.fioi” Variant (part of the STOP/DJVU family) Technical Breakdown File Extension & Renaming Patterns Confirmed extension: .fioi (lower-case, appended after the original extension). Typical renaming pattern: <original_name>.<original_ext>.fioi Example: Annual_Report.xlsx ➔ Annual_Report.xlsx.fioi Note: System/boot files are skipped; focus is on user documents, pictures, archives, PST/OST files, etc. Detection & Outbreak Timeline First submitted…