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satoriSMB.py
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import untangle
import struct
import satoriCommon
from pathlib import Path
from datetime import datetime
from pypacker.layer12 import ethernet
from pypacker.layer3 import ip
#from pypacker.layer567 import smb
import smbHeader
# grab the latest fingerprint files:
# wget chatteronthewire.org/download/updates/satori/fingerprints/tcp.xml -O tcp.xml
#
# looking for new fingerprints
# python3 satori.py > output.txt
# cat output.txt | awk -F';' '{print $3, $4, $5, $6, $7}' | sort -u > output2.txt
# cat output.txt | awk -F';' '{print $5";"$6";"$7}' | sort -u > output2.txt
#
#
# while I'd like to build this one out, it requires using the sequence of previous ones to compare to current to see if it is a factor of "blah" (256 for example).
# as I'm not tracking stuf in this version of Satori, for now this module will not be completed, but it is at least started.
#
def version():
dateReleased='satoriSMB.py - 2022-09-26'
print(dateReleased)
smbHeader.version()
def networkByteOrder(data): #use struct to handle this instead!
list = []
val = hex(data).strip("0x")
print(data)
print(val)
for i in range(0, len(val), 2):
list.insert(0,val[i:i+2])
return(list)
def parseBuffer(buf, unicode):
val = ''
if unicode == False:
for i in range(0, len(buf)):
if buf[i] == 0:
val = val + ','
else:
val = val + chr(buf[i])
else:
for i in range(0, len(buf), 2):
if buf[i] == 0:
val = val + ','
else:
val = val + chr(buf[i])
return(val)
def smbUDPProcess(pkt, layer, ts, browserExactList, browserPartialList):
if layer == 'eth':
src_mac = pkt[ethernet.Ethernet].src_s
else:
#fake filler mac for all the others that don't have it, may have to add some elif above
src_mac = '00:00:00:00:00:00'
fingerprint = None
timeStamp = datetime.utcfromtimestamp(ts).isoformat()
ip4 = pkt.upper_layer
udp1 = ip4.upper_layer
if udp1.sport != 138: #should I look at more than port 138 here?
sys.exit(1)
nbds1 = smbHeader.NBDS_Header(udp1.body_bytes)
smb = smbHeader.UDPSMB_Header(nbds1.body_bytes)
if smb.command == 0x25:
trans = smbHeader.transRequest_Header(smb.body_bytes)
mail = smbHeader.SMBMailSlot_Header(trans.body_bytes)
mailname = ''
i = 0
while True: #since this is variable length have to look through it until 0x00
mailname = mailname + chr(mail.body_bytes[i])
i = i + 1
if mail.body_bytes[i] == 0x00:
break
if (mail.body_bytes[i+1] == 0x01) or (mail.body_bytes[i+1] == 0x0f):
announce = smbHeader.MWBP_HostAnnounce(mail.body_bytes[i+1:])
osVersion = str(announce.osMajorVer) + '.' + str(announce.osMinVer)
browVersion = str(announce.browMajorVer) + '.' + str(announce.browMinVer)
if (osVersion != '') and (browVersion != ''):
smbFingerprint = osVersion + ';' + browVersion
osGuess = SMBUDPFingerprintLookup(browserExactList, browserPartialList, smbFingerprint)
fingerprint = ip4.src_s + ';' + src_mac + ';SMBBROWSER;' + smbFingerprint + ';' + osGuess
return [timeStamp, fingerprint]
def smbTCPProcess(pkt, layer, ts, nativeExactList, lanmanExactList, nativePartialList, lanmanPartialList):
if layer == 'eth':
src_mac = pkt[ethernet.Ethernet].src_s
else:
#fake filler mac for all the others that don't have it, may have to add some elif above
src_mac = '00:00:00:00:00:00'
ip4 = pkt.upper_layer
tcp1 = ip4.upper_layer
x = len(smbHeader.netbiosSessionService())
fingerprintOS = None
fingerprintLanMan = None
timeStamp = datetime.utcfromtimestamp(ts).isoformat()
if len(tcp1.body_bytes) >= x:
nbss1 = smbHeader.netbiosSessionService(tcp1.body_bytes)
smb1 = smbHeader.tcpSMB(nbss1.body_bytes)
if smb1.proto == 0xFF534D42:
if smb1.cmd == 0x73: #may look at others later, but for now, this is the only one of use for fingerprinting
flags2 = struct.unpack('@H',smb1.flags2)[0]
if "{0:>16b}".format(flags2)[0] == '1': #probably a better way to do this with bit shifting, but this works for now *in pascal had: (_tcp_smb.flags2 and 32768)
unicode=True
else: #0 or space
unicode=False
nativeOS = ''
nativeLanMan = ''
#smb1.body_bytes[0] = Word Count under Session Setup and Request
if smb1.body_bytes[0] == 0X0:
pass
elif smb1.body_bytes[0] == 0X3:
SS1 = smbHeader.SSAndRequestHeader_w3(smb1.body_bytes)
if len(SS1.body_bytes) % 2 == 0:
buffer = SS1.body_bytes[1:]
else:
buffer = SS1.body_bytes
#Native OS; Native LAN Manager; Primary Domain
info = parseBuffer(buffer, unicode)
info = info.split(',')
nativeOS = info[0]
nativeLanMan = info[1]
primaryDomain = info[2]
elif smb1.body_bytes[0] == 0X4:
SS1 = smbHeader.SSAndRequestHeader_w4(smb1.body_bytes)
x = struct.unpack('@h',SS1.SecurityBlobLen)[0]
securityBlob = SS1.body_bytes[0:x]
# if x > 0:
# if securityBlob[0:7] == b'NTLMSSP':
# print(securityBlob[8])
# if securityBlob[8] == 1:
# version = smbHeader.NTLMSecurityBlobType1(securityBlob)
# major = struct.unpack('@s',version.major)[0]
# minor = struct.unpack('@s',version.minor)[0]
# build = struct.unpack('@h',version.build)[0]
# revision = struct.unpack('@s',version.revision)[0]
# print(str(major) + '.' + str(minor) + ' ' + str(build) + ' ' + str(revision))
# if x % 2 == 0:
# buffer = SS1.body_bytes[x:]
# else:
# buffer = SS1.body_bytes[x:]
buffer = SS1.body_bytes[x:]
#Native OS; Native LAN Manager
info = parseBuffer(buffer, unicode)
info = info.split(',')
nativeOS = info[0]
nativeLanMan = info[1]
elif smb1.body_bytes[0] == 0XC:
SS1 = smbHeader.SSAndRequestHeader_w12(smb1.body_bytes)
x = struct.unpack('@h',SS1.SecurityBlobLen)[0]
securityBlob = SS1.body_bytes[0:x]
# if x > 0:
# if securityBlob[0:7] == b'NTLMSSP':
# print(securityBlob[8])
# if securityBlob[8] == 1:
# version = smbHeader.NTLMSecurityBlobType1(securityBlob)
# major = struct.unpack('@b',version.major)[0]
# minor = struct.unpack('@b',version.minor)[0]
# build = struct.unpack('@h',version.build)[0]
# revision = struct.unpack('@b',version.revision)[0]
# print(str(major) + '.' + str(minor) + ' ' + str(build) + ' ' + str(revision))
# if x % 2 == 0:
# buffer = SS1.body_bytes[x:]
# else:
# buffer = SS1.body_bytes[x+1:]
buffer = SS1.body_bytes[x:]
#Native OS; Native LAN Manager
info = parseBuffer(buffer, unicode)
info = info.split(',')
nativeOS = info[0]
nativeLanMan = info[1]
elif smb1.body_bytes[0] == 0XD:
SS1 = smbHeader.SSAndRequestHeader_w13(smb1.body_bytes)
buffer = SS1.body_bytes
#Account; Primary Domain; Native OS; Native LAN Manager
ansi = struct.unpack('@h',SS1.ANSIPasswordLen)[0]
uni = struct.unpack('@h',SS1.UniCodePassLen)[0]
info = parseBuffer(buffer[ansi + uni:], unicode)
info = info.split(',')
nativeOS = info[2]
nativeLanMan = info[3]
if nativeOS != '':
osGuess = SMBTCPFingerprintLookup(nativeExactList, nativePartialList, nativeOS)
fingerprintOS = ip4.src_s + ';' + src_mac + ';SMBNATIVE;NativeOS;' + nativeOS + ';' + osGuess
if nativeLanMan != '':
osGuess = SMBTCPFingerprintLookup(lanmanExactList, lanmanPartialList, nativeLanMan)
fingerprintLanMan = ip4.src_s + ';' + src_mac + ';SMBNATIVE;NativeLanMan;' + nativeLanMan + ';' + osGuess
return [timeStamp, fingerprintOS, fingerprintLanMan]
def BuildSMBUDPFingerprintFiles():
# converting from the xml format to a more flat format that will hopefully be faster than walking the entire xml every FP lookup
browserExactList = {}
browserPartialList = {}
satoriPath = str(Path(__file__).resolve().parent)
obj = untangle.parse(satoriPath + '/fingerprints/browser.xml')
fingerprintsCount = len(obj.SMBBROWSER.fingerprints)
for x in range(0,fingerprintsCount):
os = obj.SMBBROWSER.fingerprints.fingerprint[x]['name']
testsCount = len(obj.SMBBROWSER.fingerprints.fingerprint[x].smbbrowser_tests)
test = {}
for y in range(0,testsCount):
test = obj.SMBBROWSER.fingerprints.fingerprint[x].smbbrowser_tests.test[y]
if test is None: #if testsCount = 1, then untangle doesn't allow us to iterate through it
test = obj.SMBBROWSER.fingerprints.fingerprint[x].smbbrowser_tests.test
weight = test['weight']
matchtype = test['matchtype']
osversion = test['osversion']
browserversion = test['browserversion']
if matchtype == 'exact':
fingerprint = osversion + ';' + browserversion
if fingerprint in browserExactList:
oldValue = browserExactList.get(fingerprint)
browserExactList[fingerprint] = oldValue + '|' + os + ':' + weight
else:
browserExactList[fingerprint] = os + ':' + weight
else:
fingerprint = osversion + ';' + browserversion
if fingerprint in browserPartialList:
oldValue = browserPartialList.get(fingerprint)
browserPartialList[fingerprint] = oldValue + '|' + os + ':' + weight
else:
browserPartialList[fingerprint] = os + ':' + weight
return [browserExactList, browserPartialList]
def BuildSMBTCPFingerprintFiles():
# converting from the xml format to a more flat format that will hopefully be faster than walking the entire xml every FP lookup
nativeExactList = {}
nativePartialList = {}
lanmanExactList = {}
lanmanPartialList = {}
satoriPath = str(Path(__file__).resolve().parent)
obj = untangle.parse(satoriPath + '/fingerprints/smb.xml')
fingerprintsCount = len(obj.SMB.fingerprints)
for x in range(0,fingerprintsCount):
os = obj.SMB.fingerprints.fingerprint[x]['name']
testsCount = len(obj.SMB.fingerprints.fingerprint[x].smb_tests)
test = {}
for y in range(0,testsCount):
test = obj.SMB.fingerprints.fingerprint[x].smb_tests.test[y]
if test is None: #if testsCount = 1, then untangle doesn't allow us to iterate through it
test = obj.SMB.fingerprints.fingerprint[x].smb_tests.test
weight = test['weight']
matchtype = test['matchtype']
smbnativename = test['smbnativename']
smbnativelanman = test['smbnativelanman']
if matchtype == 'exact':
if smbnativename != None:
if smbnativename in nativeExactList:
oldValue = nativeExactList.get(smbnativename)
nativeExactList[smbnativename] = oldValue + '|' + os + ':' + weight
else:
nativeExactList[smbnativename] = os + ':' + weight
elif smbnativelanman != None:
if smbnativelanman in lanmanExactList:
oldValue = lanmanExactList.get(smbnativelanman)
lanmanExactList[smbnativelanman] = oldValue + '|' + os + ':' + weight
else:
lanmanExactList[smbnativelanman] = os + ':' + weight
else:
if smbnativename != None:
if smbnativename in nativePartialList:
oldValue = nativePartialList.get(smbnativename)
nativePartialList[smbnativename] = oldValue + '|' + os + ':' + weight
else:
nativePartialList[smbnativename] = os + ':' + weight
elif smbnativelanman != None:
if smbnativelanman in lanmanPartialList:
oldValue = lanmanPartialList.get(smbnativelanman)
lanmanPartialList[smbnativelanman] = oldValue + '|' + os + ':' + weight
else:
lanmanPartialList[smbnativelanman] = os + ':' + weight
return [nativeExactList, lanmanExactList, nativePartialList, lanmanPartialList]
def SMBUDPFingerprintLookup(exactList, partialList, value):
#same as DHCP one, may be able to look at combining in the future?
exactValue = ''
partialValue = ''
if value in exactList:
exactValue = exactList.get(value)
for key, val in partialList.items():
if value.find(key) > -1:
partialValue = partialValue + '|' + val
if partialValue.startswith('|'):
partialValue = partialValue[1:]
if partialValue.endswith('|'):
partialValue = partialValue[:-1]
fingerprint = exactValue + '|' + partialValue
if fingerprint.startswith('|'):
fingerprint = fingerprint[1:]
if fingerprint.endswith('|'):
fingerprint = fingerprint[:-1]
fingerprint = satoriCommon.sortFingerprint(fingerprint)
return fingerprint
def SMBTCPFingerprintLookup(exactList, partialList, value):
#same as DHCP one, may be able to look at combining in the future?
exactValue = ''
partialValue = ''
if value in exactList:
exactValue = exactList.get(value)
for key, val in partialList.items():
if value.find(key) > -1:
partialValue = partialValue + '|' + val
if partialValue.startswith('|'):
partialValue = partialValue[1:]
if partialValue.endswith('|'):
partialValue = partialValue[:-1]
fingerprint = exactValue + '|' + partialValue
if fingerprint.startswith('|'):
fingerprint = fingerprint[1:]
if fingerprint.endswith('|'):
fingerprint = fingerprint[:-1]
fingerprint = satoriCommon.sortFingerprint(fingerprint)
return fingerprint