See the solution in Explanation.
Explanation:
To identify thefilename containing the ransomware demandfrom theransom.pcapfile, follow these detailed steps:
Step 1: Access the PCAP File
* Log into the Analyst Desktop.
* Navigate to theInvestigationsfolder located on the desktop.
* Locate the file:
ransom.pcap
Step 2: Open the PCAP File in Wireshark
* LaunchWireshark.
* Open the PCAP file:
mathematica
File > Open > Desktop > Investigations > ransom.pcap
* ClickOpento load the file.
Step 3: Apply Relevant Filters
Since ransomware demands are often delivered through files or network shares, look for:
* Common Protocols:
* SMB(for network shares)
* HTTP/HTTPS(for download or communication)
* Apply a general filter to capture suspicious file transfers:
kotlin
http or smb or ftp-data
* You can also filter based on file types or keywords related to ransomware:
frame contains "README" or frame contains "ransom"
Step 4: Identify Potential Ransomware Files
* Look for suspicious file transfers:
* CheckHTTP GET/POSTorSMB file writeoperations.
* Analyze File Names:
* Ransom notes commonly use filenames such as:
* README.txt
* DECRYPT_INSTRUCTIONS.html
* HELP_DECRYPT.txt
* Right-click on any suspicious packet and select:
arduino
Follow > TCP Stream
* Inspect the content to see if it contains a ransom note or instructions.
Step 5: Extract the File
* If you find a packet with afile transfer, extract it:
mathematica
File > Export Objects > HTTP or SMB
* Save the suspicious file to analyze its contents.
Step 6: Example Packet Details
* After filtering and following streams, you find a file transfer with the following details:
makefile
GET /uploads/README.txt HTTP/1.1
Host: 10.10.44.200
User-Agent: Mozilla/5.0
* After exporting, open the file and examine the content:
pg
Your files have been encrypted!
To recover them, you must pay in Bitcoin.
Read this file carefully for payment instructions.
README.txt
Step 7: Confirm and Document
* File Name:README.txt
* Transmission Protocol:HTTP or SMB
* Content:Contains ransomware demand and payment instructions.
Step 8: Immediate Actions
* Isolate Infected Systems:
* Disconnect compromised hosts from the network.
* Preserve the PCAP and Extracted File:
* Store them securely for forensic analysis.
* Analyze the Ransomware Note:
* Look for:
* Bitcoin addresses
* Contact instructions
* Identifiers for ransomware family
Step 9: Report the Incident
* Include the following details:
* Filename:README.txt
* Method of Delivery:HTTP (or SMB)
* Ransomware Message:Payment in Bitcoin
* Submit the report to your incident response team for further action.