CapTipper supports producing HTML reports for convenient view and sharing, and JSON report for post-analysis information gathering by a third party.

An example HTML report of the Nuclear Exploit Kit PCAP we analyzed in the first blog post, can be found here: CapTipper HTML Nuclear Report. The HTML report includes full flow details, client information, interesting binary data and more…

The report is expected to expand and include more information along with the development of CapTippers new abilities.

JSON report

The JSON file is made of 4 main parts:

  • Browsing Flow
  • PCAP Metadata
  • Client information
  • Conversations

Browsing Flow contains every redirection made to each page or file, this is later displayed visually in the HTML report. It is saved under the key flow:

"flow": {
        "hosts": {
            "name": "Client", // First Node
            "children": [
                    // Recursive structure of "name" and "children"
        "size": <graph height for HTML page>

PCAP Metadata is saved under the key info:

"info": {
    "pcap_file": <pcap file path>,
    "analysis_time": <time of analysis>,
    "captipper_version": <CapTipper Version>,
    "traffic_time": <Time of first packet>

Client information contains information collected on the client such as: IP, MAC, USER-AGENT and more interesting data if sent (such as: X-FLASH-VERSION). it is saved under the key client:

"client": {
    "IP": <IP>,
    "MAC": <MAC>,
    "USER-AGENT": <User-Agent>

Coversations are stored under the key conversations:

"conversations": [
            "name": <host domain name>,
            "ip": <IP:Port>,
            "uris": [ // List of all URIs
                    "id": <conversation id>,
                    "uri": <URI>,
                    "short_uri": <Short representation of the URI>,
                    "req_head": <Request>
                    "res_body": <Response body>,
                    "res_base64": <Response in Base64>,
                    "respeek": <256 bytes of the Response>,
                    "magic_name": <File type>,
                    "magic_ext": <File extension>,
                    "res_head": <Response Header>,
                    "res_num": <Response Number>,
                    "res_type": <Response Content type>,
                    "referer": <referrer>,
                    "filename": <File name>,
                    "method": <Request Method>,
                    "epochtime": <Date Time>,
                    "res_len": <Response size>,
                    "md5": <MD5>,
                    "sha256": <SHA256>

HTML report

Every HTML report is based on the CapTipperTemplate.html stored in the jsontemplate\ directory. In order to be able to display the report while offline - the HTML stores the content of bootstrap.js, jquery.js, bootstrap.css and part of d3.js.

The browsing flow graph is created using the d3 library and displayed from left to right.

The HTML report is a bootstrap based page containing all 4 information blocks from the JSON file.

The page shows all the conversations in each domain, where suspicious URIs colored Yellow, and Executables colored Red.

Each conversation is expandable and displays all the data relevant to that conversation.

All of the conversations response body are stored in the HTML as well in a Base64 form (does not alarm AntiViruses). each conversation has a Download button which allows the extraction of the file from the HTML into the file system.