This code snippet appears to represent a set of conditions...

August 26, 2025 at 11:54 PM

Conditions for detecting presence
or
and
fileWriteEvent/fileName contains read_me_now_\d{1,10}\.txt
fileWriteEvent/fileExtension equal txt
fileWriteEvent/filePath matches .
fileWriteEvent/process matches .
and
fileWriteEvent/md5 equal 7170292337a894ce9a58f5b2176dfefc
and
fileWriteEvent/md5 equal 7ff1a6efe00d7b78094d3eb1740f179c
and
fileWriteEvent/md5 equal d244b63e40aab7299d194c11bf060054
and
fileWriteEvent/md5 equal a6d91094a222da6576260abf52a07b79
and
fileWriteEvent/md5 equal 1859f56847ccabc6581a56f55041955f
and
fileWriteEvent/md5 equal 4e7434ac13001fe55474573aa5e9379d
and
fileWriteEvent/fileExtension equal bqtlock
fileWriteEvent/filePath matches .
fileWriteEvent/process matches .
and
fileWriteEvent/md5 equal e0080e35657caed78566384a2e7b1ef4
and
fileWriteEvent/md5 equal 9323fca75a86c75ffbdcc88ed8f35e5a

This code snippet appears to represent a set of conditions likely written in a query or detection rule format, potentially for a security monitoring system or a threat detection tool. Its purpose is to detect the presence of certain file write events based on specific criteria such as file names, extensions, file paths, processes, and MD5 hashes.

Breakdown:

Logical Operators (and/or):
- The use of and and or suggests that the system is evaluating whether multiple conditions are met (and requires all conditions to be true, while or requires at least one to be true).
fileWriteEvent rules:
- The conditions imply monitoring file-related write events, such as detecting when a file is created or modified.
Conditions for "read_me_now_\d{1,10}\.txt":
- The fileName contains read_me_now_\d{1,10}\.txt indicates detection of files whose names match the pattern read_me_now_ followed by 1 to 10 digits (\d{1,10}), ending with .txt.
fileExtension:
- A condition requires the fileExtension to be txt, ensuring the detection focuses on .txt files.
filePath and process (matches .):
- The conditions filePath matches . and process matches . likely act as placeholders to broadly include any file path or process. (The dot . in some systems represents a regular expression that matches any character.)
MD5 Hashes (Specific Checks):
- The conditions check if the cryptographic MD5 hash of the written file matches specific values:
  - 7170292337a894ce9a58f5b2176dfefc
  - 7ff1a6efe00d7b78094d3eb1740f179c
  - d244b63e40aab7299d194c11bf060054
  - a6d91094a222da6576260abf52a07b79
  - 1859f56847ccabc6581a56f55041955f
  - 4e7434ac13001fe55474573aa5e9379d
  - These hashes likely correspond to known malicious files or indicators of compromise (IOCs).
Additional Detection for .bqtlock:
- An additional condition focuses on files with the extension .bqtlock, potentially indicating another malicious file type.
- Similar checks are made for MD5 matches, such as:
  - e0080e35657caed78566384a2e7b1ef4
  - 9323fca75a86c75ffbdcc88ed8f35e5a

Summary:

This code represents a detection logic that identifies the presence of malicious files based on:

Specific file name patterns (e.g., read_me_now_\d{1,10}.txt).
Extensions (e.g., .txt, .bqtlock).
MD5 hashes (e.g., a set of predefined malicious hashes).
File paths and processes, broadly matching any conditions.

It is likely used in a cybersecurity context (e.g., an Endpoint Detection and Response (EDR) system) to trigger alerts if any of the specified conditions are satisfied, aiding in the detection of ransomware, trojans, or other malware.

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