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identify.py
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import os
import platform
import re
import struct
import subprocess
import sys
import threading
import uuid
import zipfile
import msoffcrypto
from binascii import hexlify
from collections import defaultdict
from typing import Tuple, Union, Dict
import magic
import ssdeep
from cart import get_metadata_only
from assemblyline.common.digests import get_digests_for_file
from assemblyline.common.forge import get_constants
from assemblyline.common.str_utils import dotdump, safe_str
constants = get_constants()
STRONG_INDICATORS = {
'code/vbs': [
re.compile(rb'(^|\n)On Error Resume Next'),
re.compile(rb'(^|\n)(?:Private)?[ \t]*Sub[ \t]+\w+\(*'),
re.compile(rb'(^|\n)End Module'),
re.compile(rb'(^|\n)ExecuteGlobal'),
],
'code/javascript': [
re.compile(rb'function([ \t]*|[ \t]+[\w]+[ \t]*)\([\w \t,]*\)[ \t]*{'),
re.compile(rb'\beval[ \t]*\('),
re.compile(rb'new[ \t]+ActiveXObject\('),
re.compile(rb'xfa\.((resolve|create)Node|datasets|form)'),
re.compile(rb'\.oneOfChild'),
re.compile(rb'unescape\('),
re.compile(rb'\.createElement\('),
],
'code/csharp': [
re.compile(rb'(^|\n)[ \t]*namespace[ \t]+[\w.]+'),
re.compile(rb'(^|\n)[ \t]*using[ \t]+[\w.]+;'),
re.compile(rb'(^|\n)[ \t]*internal class '),
],
'code/php': [
re.compile(rb'(^|\n)<\?php'),
re.compile(rb'namespace[ \t]+[\w.]+'),
re.compile(rb'function[ \t]*\w+[ \t]*\(\$[^)]+\)[ \t]*{'),
re.compile(rb'\beval[ \t]*\('),
],
'code/c': [
re.compile(rb'(^|\n)(static|typedef)?[ \t]*struct '),
re.compile(rb'(^|\n)#include[ \t]*([<"])[\w./]+([>"])'),
re.compile(rb'(^|\n)#(ifndef |define |endif |pragma )'),
],
'code/python': [
re.compile(rb'(^|\n)[ \t]*if __name__[ \t]*==[ \t]*[\'\"]__main__[\'\"][ \t]*:'),
re.compile(rb'(^|\n)[ \t]*from[ \t]+[\w.]+[ \t]+import[ \t]+[\w.*]+([ \t]+as \w+)?'),
re.compile(rb'(^|\n)[ \t]*def[ \t]*\w+[ \t]*\([^)]*\)[ \t]*:'),
],
'code/rust': [
re.compile(rb'(^|\n)(pub|priv)[ \t]*(struct |enum |impl |const )'),
re.compile(rb'(^|\n)[ \t]*fn[ \t]*\w+[ \t]*\(&self'),
re.compile(rb'(println!|panic!)'),
],
'code/lisp': [
re.compile(rb'(^|\n)[ \t]*\((defmacro|defun|eval-when|in-package|list|export|defvar) '),
],
'code/java': [
re.compile(rb'(^|\n)[ \t]*public[ \t]+class[ \t]+\w+[ \t]+(extends[ \t]+\w+[ \t]+)?{'),
re.compile(rb'(^|\n)[\w \t]+\([^)]+\)[ \t]+throws[ \t]+[\w, \t]+[ \t]+{'),
],
'code/perl': [
re.compile(rb'(^|\n)[ \t]*my[ \t]*\$\w+[ \t]*='),
re.compile(rb'(^|\n)[ \t]*sub[ \t]*\w+[ \t]*{'),
],
'code/ruby': [
re.compile(rb'(^|\n)[ \t]*require(_all)?[ \t]*\'[\w/]+\''),
re.compile(rb'rescue[ \t]+\w+[ \t]+=>'),
],
'code/go': [
re.compile(rb'(^|\n)[ \t]*import[ \t]+\('),
re.compile(rb'(^|\n)[ \t]*func[ \t]+\w+\('),
],
'code/css': [
re.compile(rb'(^|\n|\})(html|body|footer|span\.|img\.|a\.|\.[a-zA-Z\-.]+)[^{]+{'
rb'[ \t]*(padding|color|width|margin|background|font|text)[^}]+\}'),
],
'text/markdown': [
re.compile(rb'\*[ \t]*`[^`]+`[ \t]*-[ \t]*\w+'),
],
'document/email': [
re.compile(rb'^Content-Type: ', re.MULTILINE),
re.compile(rb'^Subject: ', re.MULTILINE),
re.compile(rb'^MIME-Version: ', re.MULTILINE),
re.compile(rb'^Message-ID: ', re.MULTILINE),
re.compile(rb'^To: ', re.MULTILINE),
re.compile(rb'^From: ', re.MULTILINE),
],
'metadata/sysmon': [
re.compile(rb'<Events>*'),
re.compile(rb'<Event>*'),
re.compile(rb'<\/Event>'),
re.compile(rb'<\/Events>'),
],
'code/xml': [
# Check if it has an xml declaration header
re.compile(rb'^\s*<\?xml[^>]+\?>', re.DOTALL | re.MULTILINE),
# Check if it begins and ends with <tag ... and </tag ...> (for informal xml usages)
re.compile(rb'^\s*<(?P<open>[\w:]+) .+</(?P=open)[^>]+>\s*$', re.DOTALL),
# Check if a tag has an xmlns attribute
re.compile(rb'<[^>]+xmlns[:=][^>]+>', re.MULTILINE),
],
'code/ps1': [
# Match one of the common Cmdlets
re.compile(rb'(^|\n)(Get-ExecutionPolicy|Get-Service|Where-Object|ConvertTo-HTML|Select-Object|Get-Process|'
rb'Clear-History|ForEach-Object|Clear-Content|Compare-Object|New-ItemProperty|New-Object|'
rb'New-WebServiceProxy|Set-Alias|Wait-Job|Get-Counter|Test-Path|Get-WinEvent|Start-Sleep|'
rb'Set-Location|Get-ChildItem|Rename-Item|Stop-Process|Add-Type)'),
# Match one of the common Classes
re.compile(rb'(-memberDefinition|-Name|-namespace|-passthru)'),
]
}
STRONG_SCORE = 15
MINIMUM_GUESS_SCORE = 20
WEAK_INDICATORS = {
'code/javascript': [rb'var ',
rb'document\.write\(',
rb'String\.(fromCharCode|raw)\(',
rb'Math\.(round|pow|sin|cos)\(',
rb'(isNaN|isFinite|parseInt|parseFloat)\(',
b'WSH',
],
'code/jscript': [rb'new[ \t]+ActiveXObject\(', rb'Scripting\.Dictionary'],
'code/pdfjs': [rb'xfa\.((resolve|create)Node|datasets|form)', rb'\.oneOfChild'],
'code/vbs': [
rb'(^|\n)*[ ]{0,1000}[\t]*(Dim |Sub |Loop |Attribute |End Sub|Function |End Function )',
b'CreateObject',
b'WScript',
b'window_onload',
b'.SpawnInstance_',
b'.Security_',
b'WSH',
],
'code/csharp': [rb'(^|\n)(protected)?[ \t]*override'],
'code/sql': [rb'(^|\n)(create |drop |select |returns |declare )'],
'code/php': [rb'\$this\->'],
'code/c': [rb'(^|\n)(const char \w+;|extern |uint(8|16|32)_t )'],
'code/python': [b'try:', b'except:', b'else:'],
'code/java': [rb'(^|\n)[ \t]*package[ \t]+[\w\.]+;'],
'code/perl': [rb'(^|\n)[ \t]*package[ \t]+[\w\.]+;', b'@_'],
'text/markdown': [rb'\[[\w]+\]:[ \t]*http:'],
'code/ps1': [
# Check for PowerShell Parameters ex. -Online -FeatureName
rb'\s-([A-Z][a-z0-9]+)+',
# Check for cmdlet names ex. Disable-WindowsOptionalFeature
rb'([A-Z][a-z0-9]+)+-([A-Z][a-z0-9]+)+',
]
}
WEAK_SCORE = 1
WEAK_INDICATORS = {k: re.compile(b'|'.join(v)) for k, v in WEAK_INDICATORS.items()}
SHEBANG = re.compile(rb'^#![\w./]+/(?:env[ \t]*)?(\w+)[ \t]*\n')
EXECUTABLES = {
'escript': 'erlang',
'nush': 'nu',
'macruby': 'ruby',
'jruby': 'ruby',
'rbx': 'ruby',
}
OLE_CLSID_GUIDs = {
# GUID v0 (0)
"00020803-0000-0000-C000-000000000046": "document/office/word", # "MS Graph Chart"
"00020900-0000-0000-C000-000000000046": "document/office/word", # "MS Word95"
"00020901-0000-0000-C000-000000000046": "document/office/word", # "MS Word 6.0 - 7.0 Picture"
"00020906-0000-0000-C000-000000000046": "document/office/word", # "MS Word97"
"00020907-0000-0000-C000-000000000046": "document/office/word", # "MS Word"
"00020C01-0000-0000-C000-000000000046": "document/office/excel", # "Excel"
"00020821-0000-0000-C000-000000000046": "document/office/excel", # "Excel"
"00020820-0000-0000-C000-000000000046": "document/office/excel", # "Excel97"
"00020810-0000-0000-C000-000000000046": "document/office/excel", # "Excel95"
"00021a14-0000-0000-C000-000000000046": "document/office/visio", # "Visio"
"0002CE02-0000-0000-C000-000000000046": "document/office/equation", # "MS Equation 3.0"
"0003000A-0000-0000-C000-000000000046": "document/office/paintbrush", # "Paintbrush Picture",
"0003000C-0000-0000-C000-000000000046": "document/office/package", # "Package"
"000C1084-0000-0000-C000-000000000046": "document/installer/windows", # "Installer Package (MSI)"
"00020D0B-0000-0000-C000-000000000046": "document/email", # "MailMessage"
# GUID v1 (Timestamp & MAC-48)
"29130400-2EED-1069-BF5D-00DD011186B7": "document/office/wordpro", # "Lotus WordPro"
"46E31370-3F7A-11CE-BED6-00AA00611080": "document/office/word", # "MS Forms 2.0 MultiPage"
"5512D110-5CC6-11CF-8D67-00AA00BDCE1D": "document/office/word", # "MS Forms 2.0 HTML SUBMIT"
"5512D11A-5CC6-11CF-8D67-00AA00BDCE1D": "document/office/word", # "MS Forms 2.0 HTML TEXT"
"5512D11C-5CC6-11CF-8D67-00AA00BDCE1D": "document/office/word", # "MS Forms 2.0 HTML Hidden"
"64818D10-4F9B-11CF-86EA-00AA00B929E8": "document/office/powerpoint", # "MS PowerPoint Presentation"
"64818D11-4F9B-11CF-86EA-00AA00B929E8": "document/office/powerpoint", # "MS PowerPoint Presentation"
"11943940-36DE-11CF-953E-00C0A84029E9": "document/office/word", # "MS Photo Editor 3.0 Photo"
"B801CA65-A1FC-11D0-85AD-444553540000": "document/pdf", # "Adobe Acrobat Document"
"A25250C4-50C1-11D3-8EA3-0090271BECDD": "document/office/wordperfect", # "WordPerfect Office"
"C62A69F0-16DC-11CE-9E98-00AA00574A4F": "document/office/word", # "Microsoft Forms 2.0 Form"
"F4754C9B-64F5-4B40-8AF4-679732AC0607": "document/office/word", # Word.Document.12
"BDD1F04B-858B-11D1-B16A-00C0F0283628": "document/office/word", # Doc (see CVE2012-0158)
}
recognized = constants.RECOGNIZED_TYPES
tag_to_extension = {
'archive/chm': '.chm',
'audiovisual/flash': '.swf',
'code/batch': '.bat',
'code/c': '.c',
'code/csharp': '.cs',
'code/hta': '.hta',
'code/html': '.html',
'code/java': '.java',
'code/javascript': '.js',
'code/jscript': '.js',
'code/pdfjs': '.js',
'code/perl': '.pl',
'code/php': '.php',
'code/ps1': '.ps1',
'code/python': '.py',
'code/ruby': '.rb',
'code/vbs': '.vbs',
'code/wsf': '.wsf',
'document/installer/windows': '.msi',
'document/office/excel': '.xls',
'document/office/mhtml': '.mhtml',
'document/office/ole': '.doc',
'document/office/powerpoint': '.ppt',
'document/office/rtf': '.doc',
'document/office/unknown': '.doc',
'document/office/visio': '.vsd',
'document/office/word': '.doc',
'document/office/wordperfect': 'wp',
'document/office/wordpro': 'lwp',
'document/pdf': '.pdf',
'document/email': '.eml',
'executable/windows/pe32': '.exe',
'executable/windows/pe64': '.exe',
'executable/windows/dll32': '.dll',
'executable/windows/dll64': '.dll',
'executable/windows/dos': '.exe',
'executable/windows/com': '.exe',
'executable/linux/elf32': '.elf',
'executable/linux/elf64': '.elf',
'executable/linux/so32': '.so',
'executable/linux/so64': '.so',
'java/jar': '.jar',
'silverlight/xap': '.xap',
'meta/shortcut/windows': '.lnk',
}
sl_patterns = [
['tnef', r'Transport Neutral Encapsulation Format'],
['chm', r'MS Windows HtmlHelp Data'],
['windows/dll64', r'^pe32\+ .*dll.*x86\-64'],
['windows/pe64', r'^pe32\+ .*x86\-64.*windows'],
['windows/dll32', r'^pe32 .*dll'],
['windows/pe32', r'^pe32 .*windows'],
['windows/pe', r'^pe unknown.*windows'],
['windows/dos', r'^(ms-)?dos executable'],
['windows/com', r'^com executable'],
['windows/dos', r'^8086 relocatable'],
['linux/elf32', r'^elf 32-bit lsb +executable'],
['linux/elf64', r'^elf 64-bit lsb +executable'],
['linux/so32', r'^elf 32-bit lsb +shared object'],
['linux/so64', r'^elf 64-bit lsb +shared object'],
['mach-o', r'^Mach-O'],
['7-zip', r'^7-zip archive data'],
['ace', r'^ACE archive data'],
['bzip2', r'^bzip2 compressed data'],
['cabinet', r'^installshield cab'],
['cabinet', r'^microsoft cabinet archive data'],
['cpio', r'cpio archive'],
['gzip', r'^gzip compressed data'],
['iso', r'ISO 9660'],
['lzma', r'^LZMA compressed data'],
['rar', r'^rar archive data'],
['tar', r'^(GNU|POSIX) tar archive'],
['ar', r'ar archive'],
['xz', r'^XZ compressed data'],
['zip', r'^zip archive data'],
['tcpdump', r'^tcpdump'],
['pdf', r'^pdf document'],
['bmp', r'^pc bitmap'],
['gif', r'^gif image data'],
['jpg', r'^jpeg image data'],
['png', r'^png image data'],
['installer/windows', r'(Installation Database|Windows Installer)'],
['office/excel', r'Microsoft.*Excel'],
['office/powerpoint', r'Microsoft.*PowerPoint'],
['office/word', r'Microsoft.*Word'],
['office/rtf', r'Rich Text Format'],
['office/ole', r'OLE 2'],
['office/unknown', r'Composite Document File|CDFV2'],
['office/unknown', r'Microsoft.*(OOXML|Document)'],
['office/unknown', r'Number of (Characters|Pages|Words)'],
['flash', r'Macromedia Flash'],
['autorun', r'microsoft windows autorun'],
['batch', r'dos batch file'],
['jar', r'[ (]Jar[) ]'],
['java', r'java program'],
['class', r'java class data'],
['perl', r'perl .*script'],
['php', r'php script'],
['python', r'python .*(script|byte)'],
['shell', r'(shell|sh) script'],
['xml', r'OpenGIS KML'],
['html', r'html'],
['sgml', r'sgml'],
['xml', r'xml'],
['sff', r'Frame Format'],
['shortcut/windows', r'^MS Windows shortcut'],
['email', r'Mime entity text'],
['sysmon', r'MS Windows Vista Event Log'],
]
sl_patterns = [[x[0], re.compile(x[1], re.IGNORECASE)] for x in sl_patterns]
sl_to_tl = {
'windows/com': 'executable',
'windows/dos': 'executable',
'windows/pe32': 'executable',
'windows/pe64': 'executable',
'windows/dll32': 'executable',
'windows/dll64': 'executable',
'linux/elf32': 'executable',
'linux/elf64': 'executable',
'linux/so32': 'executable',
'linux/so64': 'executable',
'mach-o': 'executable',
'7-zip': 'archive',
'bzip2': 'archive',
'cabinet': 'archive',
'gzip': 'archive',
'iso': 'archive',
'rar': 'archive',
'tar': 'archive',
'zip': 'archive',
'tcpdump': 'network',
'pdf': 'document',
'bmp': 'image',
'gif': 'image',
'jpg': 'image',
'png': 'image',
'shortcut/windows': 'meta',
}
# pylint:disable=C0301
tl_patterns = [
['document',
r'Composite Document File|CDFV2|Corel|OLE 2|OpenDocument |Rich Text Format|Microsoft.*'
r'(Document|Excel|PowerPoint|Word|OOXML)|Number of (Characters|Pages|Words)'],
['document', r'PostScript|pdf|MIME entity text'],
['java', r'jar |java'],
['code',
r'Autorun|HTML |KML |LLVM |SGML |Visual C|XML |awk|batch |bytecode|perl|php|program|python'
r'|ruby|scheme|script text exe|shell script|tcl'],
['network', r'capture'],
['unknown', r'CoreFoundation|Dreamcast|KEYBoard|OSF/Rose|Zope|quota|uImage'],
['unknown', r'disk|file[ ]*system|floppy|tape'],
['audiovisual',
r'Macromedia Flash|Matroska|MIDI data|MPEG|MP4|MPG|MP3|QuickTime|RIFF|WebM|animation|audio|movie|music|ogg'
r'|sound|tracker|video|voice data'],
['executable', r'803?86|COFF|ELF|Mach-O|ia32|executable|kernel|library|libtool|object'],
['unknown', r'Emulator'],
['image', r'DjVu|Surface|XCursor|bitmap|cursor|color|font|graphics|icon|image|jpeg'],
['archive',
r'BinHex|InstallShield CAB|Transport Neutral Encapsulation Format|archive data|compress|mcrypt'
r'|MS Windows HtmlHelp Data|current ar archive|cpio archive|ISO 9660'],
['meta', r'^MS Windows shortcut'],
['metadata', r'MS Windows Vista Event Log'],
['unknown', r'.*'],
]
trusted_mimes = {
'application/x-bittorrent': 'meta/torrent',
'application/x-tar': 'archive/tar',
'message/rfc822': 'document/email',
'text/calendar': 'text/calendar',
'image/svg+xml': 'image/svg',
'application/x-mach-binary': 'executable/mach-o',
'application/vnd.ms-outlook': 'document/office/email'
}
tl_patterns = [[x[0], re.compile(x[1], re.IGNORECASE)] for x in tl_patterns]
custom = re.compile(r'^custom: ', re.IGNORECASE)
ssdeep_from_file = None
magic_lock = None
file_type = None
mime_type = None
if platform.system() != 'Windows':
magic_lock = threading.Lock()
file_type = magic.magic_open(magic.MAGIC_CONTINUE + magic.MAGIC_RAW)
magic.magic_load(file_type, constants.RULE_PATH)
mime_type = magic.magic_open(magic.MAGIC_CONTINUE + magic.MAGIC_RAW + magic.MAGIC_MIME)
magic.magic_load(mime_type, constants.RULE_PATH)
ssdeep_from_file = ssdeep.hash_from_file
# Translate the match object into a sub-type label.
def subtype(label: str) -> str:
for entry in sl_patterns:
if entry[1].search(label): # pylint: disable=E1101
return entry[0]
return 'unknown'
def ident(buf, length: int, path) -> Dict:
data = {'ascii': None, 'hex': None, 'magic': None, 'mime': None, 'type': 'unknown'}
if length <= 0:
return data
header = buf[:min(64, length)]
data['ascii'] = dotdump(header)
data['hex'] = safe_str(hexlify(header))
# noinspection PyBroadException
try:
# Loop over the labels returned by libmagic, ...
labels = []
if file_type:
with magic_lock:
labels = magic.magic_file(file_type, path).split(b'\n')
labels = [label[2:].strip() if label.startswith(b'- ') else label.strip() for label in labels]
mimes = []
if mime_type:
with magic_lock:
mimes = magic.magic_file(mime_type, path).split(b'\n')
mimes = [mime[2:].strip() if mime.startswith(b'- ') else mime.strip() for mime in mimes]
# For user feedback set the mime and magic meta data to always be the primary
# libmagic responses
if len(labels) > 0:
data['magic'] = safe_str(labels[0])
if len(mimes) > 0 and mimes[0] != b'':
data['mime'] = safe_str(mimes[0])
# Highest priority is given to mime type matching something
tagged = False
for label in labels:
label = dotdump(label)
if custom.match(label):
data['type'] = label.split('custom: ')[1].strip()
tagged = True
break
# Second priority is mime times marked as trusted
if not tagged:
for mime in mimes:
mime = dotdump(mime)
if mime in trusted_mimes:
data['type'] = trusted_mimes[mime]
tagged = True
break
# As a third priority try matching the tl_patterns
if not tagged:
minimum = len(tl_patterns)
sl_tag = None
# Try each label and see how far down the tl_patterns list we go
# before we hit a match, the closer to the beginning of the list we are the better
# the tag match is. The final line of tl_patterns matches anything and sets
# tag to 'unknown', so this loop should never finish with sl_tag as None
# Unless the tl_patters table has been changed inappropriately
for label in labels:
label = dotdump(label)
# ... match against our patterns and, ...
index = 0
for entry in tl_patterns:
if index >= minimum:
break
if entry[1].search(label): # pylint:disable=E1101
break
index += 1
# ... keep highest precedence (lowest index) match.
if index < minimum:
minimum = index
sl_tag = subtype(label)
# If a label does match, take the best from that label
# Further labels from magic are probably terrible
break
assert sl_tag is not None, "tl_patterns seems to be missing a match all => unknown rule at the end"
# Based on the sub tag we found, figure out the top level tag to use
tl_tag = sl_to_tl.get(sl_tag, tl_patterns[minimum][0])
data['type'] = '/'.join((tl_tag, sl_tag))
except Exception as e:
print(str(e))
pass
if not recognized.get(data['type'], False):
data['type'] = 'unknown'
if data['type'] == 'document/office/unknown':
# noinspection PyBroadException
try:
root_entry_property_offset = buf.find(u"Root Entry".encode("utf-16-le"))
if -1 != root_entry_property_offset:
# Get root entry's GUID and try to guess document type
clsid_offset = root_entry_property_offset + 0x50
if len(buf) >= clsid_offset + 16:
clsid = buf[clsid_offset:clsid_offset + 16]
if len(clsid) == 16 and clsid != "\0" * len(clsid):
clsid_str = uuid.UUID(bytes_le=clsid)
clsid_str = clsid_str.urn.rsplit(':', 1)[-1].upper()
if clsid_str in OLE_CLSID_GUIDs:
data['type'] = OLE_CLSID_GUIDs[clsid_str]
except Exception:
pass
return data
def _confidence(score: Union[int, float]) -> str:
conf = float(score) / float(STRONG_SCORE * 5)
conf = min(1.0, conf) * 100
return str(int(conf)) + r'%'
def _differentiate(lang: str, scores_map: Dict) -> str:
if lang == 'code/javascript':
jscript_score = scores_map['code/jscript']
pdfjs_score = scores_map['code/pdfjs']
if pdfjs_score > 0 and pdfjs_score > jscript_score:
return 'code/pdfjs'
elif jscript_score > 0:
return 'code/jscript'
return lang
# Pass a filepath and this will return the guessed language in the AL tag format.
def guess_language(path: str) -> Tuple[str, Union[str, int]]:
file_length = os.path.getsize(path)
with open(path, 'rb') as fh:
if file_length > 131070:
buf = fh.read(65535)
fh.seek(file_length - 65535)
buf += fh.read(65535)
else:
buf = fh.read()
scores = defaultdict(int)
shebang_lang = re.match(SHEBANG, buf)
if shebang_lang:
lang = shebang_lang.group(1)
lang = 'code/' + EXECUTABLES.get(safe_str(lang), safe_str(lang))
scores[lang] = STRONG_SCORE * 3
for lang, patterns in STRONG_INDICATORS.items():
for pattern in patterns:
for _ in re.findall(pattern, buf):
scores[lang] += STRONG_SCORE
for lang, pattern in WEAK_INDICATORS.items():
for _ in re.findall(pattern, buf):
scores[lang] += WEAK_SCORE
for lang in list(scores.keys()):
if scores[lang] < MINIMUM_GUESS_SCORE:
scores.pop(lang)
max_v = 0
if len(scores) > 0:
max_v = max(list(scores.values()))
high_scores = [(k, v) for k, v in scores.items() if v == max_v]
high_scores = [(_differentiate(k, scores), v) for k, v in high_scores]
if len(high_scores) != 1:
return 'unknown', 0
else:
confidences = [(k, _confidence(v)) for k, v in high_scores]
return confidences[0]
# noinspection PyBroadException
def zip_ident(path: str, fallback: str = None) -> str:
file_list = []
try:
with zipfile.ZipFile(path, "r") as zf:
file_list = [zfname for zfname in zf.namelist()]
except Exception:
try:
stdout, _ = subprocess.Popen(["unzip", "-l", path],
stderr=subprocess.PIPE,
stdout=subprocess.PIPE).communicate()
lines = stdout.splitlines()
index = lines[1].index(b"Name")
for file_name in lines[3:-2]:
file_list.append(safe_str(file_name[index:]))
except Exception:
if fallback is not None:
return fallback
tot_files = 0
tot_class = 0
tot_jar = 0
is_ipa = False
is_jar = False
is_word = False
is_excel = False
is_ppt = False
doc_props = False
doc_rels = False
doc_types = False
android_manifest = False
android_dex = False
for file_name in file_list:
if file_name[:8] == 'META-INF' and file_name[9:] == 'MANIFEST.MF':
is_jar = True
elif file_name == 'AndroidManifest.xml':
android_manifest = True
elif file_name == 'classes.dex':
android_dex = True
elif file_name.startswith('Payload/') and file_name.endswith(".app/Info.plist"):
is_ipa = True
elif file_name.endswith(".class"):
tot_class += 1
elif file_name.endswith(".jar"):
tot_jar += 1
elif file_name.startswith('word/'):
is_word = True
elif file_name.startswith('xl/'):
is_excel = True
elif file_name.startswith('ppt/'):
is_ppt = True
elif file_name.startswith('docProps/'):
doc_props = True
elif file_name.startswith('_rels/'):
doc_rels = True
elif file_name == '[Content_Types].xml':
doc_types = True
tot_files += 1
if 0 < tot_files < (tot_class + tot_jar) * 2:
is_jar = True
if is_jar and android_manifest and android_dex:
return 'android/apk'
elif is_ipa:
return 'ios/ipa'
elif is_jar:
return 'java/jar'
elif (doc_props or doc_rels) and doc_types:
if is_word:
return 'document/office/word'
elif is_excel:
return 'document/office/excel'
elif is_ppt:
return 'document/office/powerpoint'
else:
return 'document/office/unknown'
else:
return 'archive/zip'
# noinspection PyBroadException
def cart_ident(path: str) -> str:
try:
metadata = get_metadata_only(path)
except Exception:
return 'corrupted/cart'
return metadata.get('al', {}).get('type', 'archive/cart')
def dos_ident(path: str) -> str:
# noinspection PyBroadException
try:
with open(path, "rb") as fh:
file_header = fh.read(0x40)
if file_header[0:2] != "MZ":
raise ValueError()
header_pos, = struct.unpack("<I", file_header[-4:])
fh.seek(header_pos)
if fh.read(4) != "PE\x00\x00":
raise ValueError()
machine_id, = struct.unpack("<H", fh.read(2))
if machine_id == 0x014c:
width = 32
elif machine_id == 0x8664:
width = 64
else:
raise ValueError()
characteristics, = struct.unpack("<H", fh.read(18)[-2:])
if characteristics & 0x2000:
pe_type = "dll"
elif characteristics & 0x0002:
pe_type = "pe"
else:
raise ValueError()
return "executable/windows/%s%i" % (pe_type, width)
except Exception:
pass
return "executable/windows/dos"
def fileinfo(path: str) -> Dict:
path = safe_str(path)
data = get_digests_for_file(path, on_first_block=ident)
# This is a special case, we know if the mime is set to one of these values
# then the input file is almost certainly an office file, but based on only the first
# block magic can't figure out any more than that. To handle that case we will read the
# entire file, and identify again.
if data['mime'] is not None and data['mime'].lower() in ['application/cdfv2-corrupt', 'application/cdfv2-unknown']:
with open(path, 'rb') as fh:
buf = fh.read()
buflen = len(buf)
data.update(ident(buf, buflen))
data['ssdeep'] = ssdeep_from_file(path) if ssdeep_from_file else ''
# When data is parsed from a cart file we trust its metatdata and can skip the recognition test later
cart_metadata_set = False
if not int(data.get('size', -1)):
data['type'] = 'empty'
elif data['type'] in ['archive/zip', 'java/jar']:
# In addition to explicit zip files, we also want to run zip_ident when
# a file is a jar as there is a high rate of false positive (magic
# matching eclipse and other java related files as jars)
data['type'] = zip_ident(path)
elif data['type'] == 'document/office/unknown':
# For unknown document files try identifying them by unziping,
# but don't commit to it being a zip if it can't be extracted
data['type'] = zip_ident(path, data['type'])
elif data['type'] == 'unknown':
data['type'], _ = guess_language(path)
elif data['type'] == 'archive/cart':
data['type'] = cart_ident(path)
cart_metadata_set = True
elif data['type'] == 'executable/windows/dos':
# The default magic file misidentifies PE files with a munged DOS header
data['type'] = dos_ident(path)
elif data['type'] == 'code/html':
# Magic detects .hta files as .html, guess_language detects .hta files as .js/.vbs
# If both conditions are met, it's fair to say that the file is an .hta
lang, _ = guess_language(path)
if lang in ["code/javascript", "code/vbs"]:
data['type'] = 'code/hta'
if data['type'] in ['document/office/word', 'document/office/excel',
'document/office/powerpoint', 'document/office/unknown']:
try:
msoffcrypto_obj = msoffcrypto.OfficeFile(open(path, "rb"))
if msoffcrypto_obj and msoffcrypto_obj.is_encrypted():
data['type'] = 'document/office/passwordprotected'
except Exception:
# If msoffcrypto can't handle the file to confirm that it is/isn't password protected,
# then it's not meant to be. Moving on!
pass
if not recognized.get(data['type'], False) and not cart_metadata_set:
data['type'] = 'unknown'
return data
if __name__ == '__main__':
from pprint import pprint
# noinspection PyBroadException
if len(sys.argv) > 1:
pprint(fileinfo(sys.argv[1]))
else:
name = sys.stdin.readline().strip()
while name:
a = fileinfo(name)
print('\t'.join(dotdump(str(a[k])) for k in ('type', 'ascii',
'entropy', 'hex', 'magic',
'mime', 'md5', 'sha1', 'sha256',
'ssdeep', 'size')))
name = sys.stdin.readline().strip()