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Extractors for EVT, EVTX, SQLITE added along with some extra signatures. #880

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merged 4 commits into from
Nov 8, 2019
Merged

Extractors for EVT, EVTX, SQLITE added along with some extra signatures. #880

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a477294
Added WAV extractor.
n1073645 Nov 8, 2019
2387452
Comment the WAV extractor.
n1073645 Nov 8, 2019
4d9bfca
Comment the WAV extractor.
n1073645 Nov 8, 2019
eb81b92
SQLITE, EVT, EVTX and Signatures added
n1073645 Nov 8, 2019
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231 changes: 227 additions & 4 deletions src/core/lib/FileSignatures.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -736,7 +736,7 @@ export const FILE_SIGNATURES = {
10: 0x56,
11: 0x45
},
extractor: null
extractor: extractWAV
},
{
name: "OGG audio",
Expand Down Expand Up @@ -1870,7 +1870,7 @@ export const FILE_SIGNATURES = {
2: 0x4c,
3: 0x69
},
extractor: null
extractor: extractSQLITE
},
{
name: "BitTorrent link",
Expand Down Expand Up @@ -1993,7 +1993,7 @@ export const FILE_SIGNATURES = {
6: 0x4c,
7: 0x65
},
extractor: null
extractor: extractEVT
},
{
name: "Windows Event Log",
Expand All @@ -2009,7 +2009,7 @@ export const FILE_SIGNATURES = {
5: 0x6c,
6: 0x65
},
extractor: null
extractor: extractEVTX
},
{
name: "Windows Pagedump",
Expand Down Expand Up @@ -2331,6 +2331,133 @@ export const FILE_SIGNATURES = {
19: 0x46
},
extractor: null
},
{
name: "Bash",
extension: "bash",
mime: "application/bash",
description: "",
signature: {
0: 0x23, // #!/bin/bash
1: 0x21,
2: 0x2f,
3: 0x62,
4: 0x69,
5: 0x6e,
6: 0x2f,
7: 0x62,
8: 0x61,
9: 0x73,
10: 0x68,
},
extractor: null
},
{
name: "Shell",
extension: "sh",
mime: "application/sh",
description: "",
signature: {
0: 0x23, // #!/bin/sh
1: 0x21,
2: 0x2f,
3: 0x62,
4: 0x69,
5: 0x6e,
6: 0x2f,
7: 0x73,
8: 0x68,
},
extractor: null
},
{
name: "Python",
extension: "py,pyc,pyd,pyo,pyw,pyz",
mime: "application/python",
description: "",
signature: {
0: 0x23, // #!/usr/bin/python(2|3)
1: 0x21,
2: 0x2f,
3: 0x75,
4: 0x73,
5: 0x72,
6: 0x2f,
7: 0x62,
8: 0x69,
9: 0x6e,
10: 0x2f,
11: 0x70,
12: 0x79,
13: 0x74,
14: 0x68,
15: 0x6f,
16: 0x6e,
17: [0x32, 0x33, 0xa, 0xd],
},
extractor: null
},
{
name: "Ruby",
extension: "rb",
mime: "application/ruby",
description: "",
signature: {
0: 0x23, // #!/usr/bin/ruby
1: 0x21,
2: 0x2f,
3: 0x75,
4: 0x73,
5: 0x72,
6: 0x2f,
7: 0x62,
8: 0x69,
9: 0x6e,
10: 0x2f,
11: 0x72,
12: 0x75,
13: 0x62,
14: 0x79,
},
extractor: null
},
{
name: "perl",
extension: "pl,pm,t,pod",
mime: "application/perl",
description: "",
signature: {
0: 0x23, // #!/usr/bin/perl
1: 0x21,
2: 0x2f,
3: 0x75,
4: 0x73,
5: 0x72,
6: 0x2f,
7: 0x62,
8: 0x69,
9: 0x6e,
10: 0x2f,
11: 0x70,
12: 0x65,
13: 0x72,
14: 0x6c,
},
extractor: null
},
{
name: "php",
extension: "php,phtml,php3,php4,php5,php7,phps,php-s,pht,phar",
mime: "application/php",
description: "",
signature: {
0: 0x3c, // <?php
1: 0x3f,
2: 0x70,
3: 0x68,
4: 0x70,
},
extractor: null
}
]
};
Expand Down Expand Up @@ -2642,6 +2769,25 @@ export function extractBMP(bytes, offset) {
return stream.carve();
}

/**
* WAV extractor.
*
* @param {Uint8Array} bytes
* @param {Number} offset
* @returns {Uint8Array}
*/
export function extractWAV(bytes, offset) {
const stream = new Stream(bytes.slice(offset));

// Move to file size field.
stream.moveTo(4);

// Move to file size.
stream.moveTo(stream.readInt(4, "le")-4);

return stream.carve();
}


/**
* FLV extractor.
Expand Down Expand Up @@ -2730,6 +2876,32 @@ export function extractRTF(bytes, offset) {
}


/**
* SQLITE extractor.
*
* @param {Uint8Array} bytes
* @param {number} offset
* @returns {Uint8Array}
*/
export function extractSQLITE(bytes, offset) {
const stream = new Stream(bytes.slice(offset));

stream.moveTo(16);

// Extract the size of the page.
const pageSize = stream.readInt(2);

stream.moveTo(28);

// Extract the number of pages.
const numPages = stream.readInt(4);

// Move to the end of all the pages.
stream.moveTo(pageSize*numPages);
return stream.carve();
}


/**
* PList (XML) extractor.
*
Expand Down Expand Up @@ -3157,3 +3329,54 @@ function readHuffmanCode(stream, table) {

return codeWithLength & 0xffff;
}


/**
* EVTX extractor.
*
* @param {Uint8Array} bytes
* @param {Number} offset
* @returns {Uint8Array}
*/
export function extractEVTX(bytes, offset) {
const stream = new Stream(bytes.slice(offset));
stream.moveTo(0x28);

// Move to first ELFCHNK.
const total = stream.readInt(4, "le") - 0x2c;
stream.moveForwardsBy(total);
while (stream.hasMore()) {

// Loop through ELFCHNKs.
if (stream.getBytes(7).join("") === [0x45, 0x6c, 0x66, 0x43, 0x68, 0x6e, 0x6b].join(""))
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getBytes consumes those bytes, so if we don't find this pattern, do we need to move backwards by 7 bytes?

stream.moveForwardsBy(0xfff9);
else
break;
}
return stream.carve();
}


/**
* EVT extractor.
*
* @param {Uint8Array} bytes
* @param {Number} offset
* @returns {Uint8Array}
*/
export function extractEVT(bytes, offset) {
const stream = new Stream(bytes.slice(offset));

stream.moveTo(0x14);

// Extract offset of EOF.
const eofoffset = stream.readInt(4, "le");
stream.moveTo(eofoffset);

// Extract the size of the EOF.
const eofsize = stream.readInt(4, "le");

// Move past EOF.
stream.moveForwardsBy(eofsize-4);
return stream.carve();
}