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winlogbeat-sysmon.js
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winlogbeat-sysmon.js
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// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
// or more contributor license agreements. Licensed under the Elastic License;
// you may not use this file except in compliance with the Elastic License.
// Polyfill for String startsWith.
if (!String.prototype.startsWith) {
Object.defineProperty(String.prototype, "startsWith", {
value: function (search, pos) {
pos = !pos || pos < 0 ? 0 : +pos;
return this.substring(pos, pos + search.length) === search;
},
});
}
var sysmon = (function () {
var path = require("path");
var processor = require("processor");
var winlogbeat = require("winlogbeat");
var net = require("net");
// Windows error codes for DNS. This list was generated using
// 'go run gen_dns_error_codes.go'.
var dnsQueryStatusCodes = {
"0": "SUCCESS",
"5": "ERROR_ACCESS_DENIED",
"8": "ERROR_NOT_ENOUGH_MEMORY",
"13": "ERROR_INVALID_DATA",
"14": "ERROR_OUTOFMEMORY",
"123": "ERROR_INVALID_NAME",
"1214": "ERROR_INVALID_NETNAME",
"1223": "ERROR_CANCELLED",
"1460": "ERROR_TIMEOUT",
"4312": "ERROR_OBJECT_NOT_FOUND",
"9001": "DNS_ERROR_RCODE_FORMAT_ERROR",
"9002": "DNS_ERROR_RCODE_SERVER_FAILURE",
"9003": "DNS_ERROR_RCODE_NAME_ERROR",
"9004": "DNS_ERROR_RCODE_NOT_IMPLEMENTED",
"9005": "DNS_ERROR_RCODE_REFUSED",
"9006": "DNS_ERROR_RCODE_YXDOMAIN",
"9007": "DNS_ERROR_RCODE_YXRRSET",
"9008": "DNS_ERROR_RCODE_NXRRSET",
"9009": "DNS_ERROR_RCODE_NOTAUTH",
"9010": "DNS_ERROR_RCODE_NOTZONE",
"9016": "DNS_ERROR_RCODE_BADSIG",
"9017": "DNS_ERROR_RCODE_BADKEY",
"9018": "DNS_ERROR_RCODE_BADTIME",
"9101": "DNS_ERROR_KEYMASTER_REQUIRED",
"9102": "DNS_ERROR_NOT_ALLOWED_ON_SIGNED_ZONE",
"9103": "DNS_ERROR_NSEC3_INCOMPATIBLE_WITH_RSA_SHA1",
"9104": "DNS_ERROR_NOT_ENOUGH_SIGNING_KEY_DESCRIPTORS",
"9105": "DNS_ERROR_UNSUPPORTED_ALGORITHM",
"9106": "DNS_ERROR_INVALID_KEY_SIZE",
"9107": "DNS_ERROR_SIGNING_KEY_NOT_ACCESSIBLE",
"9108": "DNS_ERROR_KSP_DOES_NOT_SUPPORT_PROTECTION",
"9109": "DNS_ERROR_UNEXPECTED_DATA_PROTECTION_ERROR",
"9110": "DNS_ERROR_UNEXPECTED_CNG_ERROR",
"9111": "DNS_ERROR_UNKNOWN_SIGNING_PARAMETER_VERSION",
"9112": "DNS_ERROR_KSP_NOT_ACCESSIBLE",
"9113": "DNS_ERROR_TOO_MANY_SKDS",
"9114": "DNS_ERROR_INVALID_ROLLOVER_PERIOD",
"9115": "DNS_ERROR_INVALID_INITIAL_ROLLOVER_OFFSET",
"9116": "DNS_ERROR_ROLLOVER_IN_PROGRESS",
"9117": "DNS_ERROR_STANDBY_KEY_NOT_PRESENT",
"9118": "DNS_ERROR_NOT_ALLOWED_ON_ZSK",
"9119": "DNS_ERROR_NOT_ALLOWED_ON_ACTIVE_SKD",
"9120": "DNS_ERROR_ROLLOVER_ALREADY_QUEUED",
"9121": "DNS_ERROR_NOT_ALLOWED_ON_UNSIGNED_ZONE",
"9122": "DNS_ERROR_BAD_KEYMASTER",
"9123": "DNS_ERROR_INVALID_SIGNATURE_VALIDITY_PERIOD",
"9124": "DNS_ERROR_INVALID_NSEC3_ITERATION_COUNT",
"9125": "DNS_ERROR_DNSSEC_IS_DISABLED",
"9126": "DNS_ERROR_INVALID_XML",
"9127": "DNS_ERROR_NO_VALID_TRUST_ANCHORS",
"9128": "DNS_ERROR_ROLLOVER_NOT_POKEABLE",
"9129": "DNS_ERROR_NSEC3_NAME_COLLISION",
"9130": "DNS_ERROR_NSEC_INCOMPATIBLE_WITH_NSEC3_RSA_SHA1",
"9501": "DNS_INFO_NO_RECORDS",
"9502": "DNS_ERROR_BAD_PACKET",
"9503": "DNS_ERROR_NO_PACKET",
"9504": "DNS_ERROR_RCODE",
"9505": "DNS_ERROR_UNSECURE_PACKET",
"9506": "DNS_REQUEST_PENDING",
"9551": "DNS_ERROR_INVALID_TYPE",
"9552": "DNS_ERROR_INVALID_IP_ADDRESS",
"9553": "DNS_ERROR_INVALID_PROPERTY",
"9554": "DNS_ERROR_TRY_AGAIN_LATER",
"9555": "DNS_ERROR_NOT_UNIQUE",
"9556": "DNS_ERROR_NON_RFC_NAME",
"9557": "DNS_STATUS_FQDN",
"9558": "DNS_STATUS_DOTTED_NAME",
"9559": "DNS_STATUS_SINGLE_PART_NAME",
"9560": "DNS_ERROR_INVALID_NAME_CHAR",
"9561": "DNS_ERROR_NUMERIC_NAME",
"9562": "DNS_ERROR_NOT_ALLOWED_ON_ROOT_SERVER",
"9563": "DNS_ERROR_NOT_ALLOWED_UNDER_DELEGATION",
"9564": "DNS_ERROR_CANNOT_FIND_ROOT_HINTS",
"9565": "DNS_ERROR_INCONSISTENT_ROOT_HINTS",
"9566": "DNS_ERROR_DWORD_VALUE_TOO_SMALL",
"9567": "DNS_ERROR_DWORD_VALUE_TOO_LARGE",
"9568": "DNS_ERROR_BACKGROUND_LOADING",
"9569": "DNS_ERROR_NOT_ALLOWED_ON_RODC",
"9570": "DNS_ERROR_NOT_ALLOWED_UNDER_DNAME",
"9571": "DNS_ERROR_DELEGATION_REQUIRED",
"9572": "DNS_ERROR_INVALID_POLICY_TABLE",
"9573": "DNS_ERROR_ADDRESS_REQUIRED",
"9601": "DNS_ERROR_ZONE_DOES_NOT_EXIST",
"9602": "DNS_ERROR_NO_ZONE_INFO",
"9603": "DNS_ERROR_INVALID_ZONE_OPERATION",
"9604": "DNS_ERROR_ZONE_CONFIGURATION_ERROR",
"9605": "DNS_ERROR_ZONE_HAS_NO_SOA_RECORD",
"9606": "DNS_ERROR_ZONE_HAS_NO_NS_RECORDS",
"9607": "DNS_ERROR_ZONE_LOCKED",
"9608": "DNS_ERROR_ZONE_CREATION_FAILED",
"9609": "DNS_ERROR_ZONE_ALREADY_EXISTS",
"9610": "DNS_ERROR_AUTOZONE_ALREADY_EXISTS",
"9611": "DNS_ERROR_INVALID_ZONE_TYPE",
"9612": "DNS_ERROR_SECONDARY_REQUIRES_MASTER_IP",
"9613": "DNS_ERROR_ZONE_NOT_SECONDARY",
"9614": "DNS_ERROR_NEED_SECONDARY_ADDRESSES",
"9615": "DNS_ERROR_WINS_INIT_FAILED",
"9616": "DNS_ERROR_NEED_WINS_SERVERS",
"9617": "DNS_ERROR_NBSTAT_INIT_FAILED",
"9618": "DNS_ERROR_SOA_DELETE_INVALID",
"9619": "DNS_ERROR_FORWARDER_ALREADY_EXISTS",
"9620": "DNS_ERROR_ZONE_REQUIRES_MASTER_IP",
"9621": "DNS_ERROR_ZONE_IS_SHUTDOWN",
"9622": "DNS_ERROR_ZONE_LOCKED_FOR_SIGNING",
"9651": "DNS_ERROR_PRIMARY_REQUIRES_DATAFILE",
"9652": "DNS_ERROR_INVALID_DATAFILE_NAME",
"9653": "DNS_ERROR_DATAFILE_OPEN_FAILURE",
"9654": "DNS_ERROR_FILE_WRITEBACK_FAILED",
"9655": "DNS_ERROR_DATAFILE_PARSING",
"9701": "DNS_ERROR_RECORD_DOES_NOT_EXIST",
"9702": "DNS_ERROR_RECORD_FORMAT",
"9703": "DNS_ERROR_NODE_CREATION_FAILED",
"9704": "DNS_ERROR_UNKNOWN_RECORD_TYPE",
"9705": "DNS_ERROR_RECORD_TIMED_OUT",
"9706": "DNS_ERROR_NAME_NOT_IN_ZONE",
"9707": "DNS_ERROR_CNAME_LOOP",
"9708": "DNS_ERROR_NODE_IS_CNAME",
"9709": "DNS_ERROR_CNAME_COLLISION",
"9710": "DNS_ERROR_RECORD_ONLY_AT_ZONE_ROOT",
"9711": "DNS_ERROR_RECORD_ALREADY_EXISTS",
"9712": "DNS_ERROR_SECONDARY_DATA",
"9713": "DNS_ERROR_NO_CREATE_CACHE_DATA",
"9714": "DNS_ERROR_NAME_DOES_NOT_EXIST",
"9715": "DNS_WARNING_PTR_CREATE_FAILED",
"9716": "DNS_WARNING_DOMAIN_UNDELETED",
"9717": "DNS_ERROR_DS_UNAVAILABLE",
"9718": "DNS_ERROR_DS_ZONE_ALREADY_EXISTS",
"9719": "DNS_ERROR_NO_BOOTFILE_IF_DS_ZONE",
"9720": "DNS_ERROR_NODE_IS_DNAME",
"9721": "DNS_ERROR_DNAME_COLLISION",
"9722": "DNS_ERROR_ALIAS_LOOP",
"9751": "DNS_INFO_AXFR_COMPLETE",
"9752": "DNS_ERROR_AXFR",
"9753": "DNS_INFO_ADDED_LOCAL_WINS",
"9801": "DNS_STATUS_CONTINUE_NEEDED",
"9851": "DNS_ERROR_NO_TCPIP",
"9852": "DNS_ERROR_NO_DNS_SERVERS",
"9901": "DNS_ERROR_DP_DOES_NOT_EXIST",
"9902": "DNS_ERROR_DP_ALREADY_EXISTS",
"9903": "DNS_ERROR_DP_NOT_ENLISTED",
"9904": "DNS_ERROR_DP_ALREADY_ENLISTED",
"9905": "DNS_ERROR_DP_NOT_AVAILABLE",
"9906": "DNS_ERROR_DP_FSMO_ERROR",
"9911": "DNS_ERROR_RRL_NOT_ENABLED",
"9912": "DNS_ERROR_RRL_INVALID_WINDOW_SIZE",
"9913": "DNS_ERROR_RRL_INVALID_IPV4_PREFIX",
"9914": "DNS_ERROR_RRL_INVALID_IPV6_PREFIX",
"9915": "DNS_ERROR_RRL_INVALID_TC_RATE",
"9916": "DNS_ERROR_RRL_INVALID_LEAK_RATE",
"9917": "DNS_ERROR_RRL_LEAK_RATE_LESSTHAN_TC_RATE",
"9921": "DNS_ERROR_VIRTUALIZATION_INSTANCE_ALREADY_EXISTS",
"9922": "DNS_ERROR_VIRTUALIZATION_INSTANCE_DOES_NOT_EXIST",
"9923": "DNS_ERROR_VIRTUALIZATION_TREE_LOCKED",
"9924": "DNS_ERROR_INVAILD_VIRTUALIZATION_INSTANCE_NAME",
"9925": "DNS_ERROR_DEFAULT_VIRTUALIZATION_INSTANCE",
"9951": "DNS_ERROR_ZONESCOPE_ALREADY_EXISTS",
"9952": "DNS_ERROR_ZONESCOPE_DOES_NOT_EXIST",
"9953": "DNS_ERROR_DEFAULT_ZONESCOPE",
"9954": "DNS_ERROR_INVALID_ZONESCOPE_NAME",
"9955": "DNS_ERROR_NOT_ALLOWED_WITH_ZONESCOPES",
"9956": "DNS_ERROR_LOAD_ZONESCOPE_FAILED",
"9957": "DNS_ERROR_ZONESCOPE_FILE_WRITEBACK_FAILED",
"9958": "DNS_ERROR_INVALID_SCOPE_NAME",
"9959": "DNS_ERROR_SCOPE_DOES_NOT_EXIST",
"9960": "DNS_ERROR_DEFAULT_SCOPE",
"9961": "DNS_ERROR_INVALID_SCOPE_OPERATION",
"9962": "DNS_ERROR_SCOPE_LOCKED",
"9963": "DNS_ERROR_SCOPE_ALREADY_EXISTS",
"9971": "DNS_ERROR_POLICY_ALREADY_EXISTS",
"9972": "DNS_ERROR_POLICY_DOES_NOT_EXIST",
"9973": "DNS_ERROR_POLICY_INVALID_CRITERIA",
"9974": "DNS_ERROR_POLICY_INVALID_SETTINGS",
"9975": "DNS_ERROR_CLIENT_SUBNET_IS_ACCESSED",
"9976": "DNS_ERROR_CLIENT_SUBNET_DOES_NOT_EXIST",
"9977": "DNS_ERROR_CLIENT_SUBNET_ALREADY_EXISTS",
"9978": "DNS_ERROR_SUBNET_DOES_NOT_EXIST",
"9979": "DNS_ERROR_SUBNET_ALREADY_EXISTS",
"9980": "DNS_ERROR_POLICY_LOCKED",
"9981": "DNS_ERROR_POLICY_INVALID_WEIGHT",
"9982": "DNS_ERROR_POLICY_INVALID_NAME",
"9983": "DNS_ERROR_POLICY_MISSING_CRITERIA",
"9984": "DNS_ERROR_INVALID_CLIENT_SUBNET_NAME",
"9985": "DNS_ERROR_POLICY_PROCESSING_ORDER_INVALID",
"9986": "DNS_ERROR_POLICY_SCOPE_MISSING",
"9987": "DNS_ERROR_POLICY_SCOPE_NOT_ALLOWED",
"9988": "DNS_ERROR_SERVERSCOPE_IS_REFERENCED",
"9989": "DNS_ERROR_ZONESCOPE_IS_REFERENCED",
"9990": "DNS_ERROR_POLICY_INVALID_CRITERIA_CLIENT_SUBNET",
"9991": "DNS_ERROR_POLICY_INVALID_CRITERIA_TRANSPORT_PROTOCOL",
"9992": "DNS_ERROR_POLICY_INVALID_CRITERIA_NETWORK_PROTOCOL",
"9993": "DNS_ERROR_POLICY_INVALID_CRITERIA_INTERFACE",
"9994": "DNS_ERROR_POLICY_INVALID_CRITERIA_FQDN",
"9995": "DNS_ERROR_POLICY_INVALID_CRITERIA_QUERY_TYPE",
"9996": "DNS_ERROR_POLICY_INVALID_CRITERIA_TIME_OF_DAY",
"10054": "WSAECONNRESET",
"10055": "WSAENOBUFS",
"10060": "WSAETIMEDOUT",
};
// Windows DNS record type constants.
// https://docs.microsoft.com/en-us/windows/win32/dns/dns-constants
var dnsRecordTypes = {
"1": "A",
"2": "NS",
"3": "MD",
"4": "MF",
"5": "CNAME",
"6": "SOA",
"7": "MB",
"8": "MG",
"9": "MR",
"10": "NULL",
"11": "WKS",
"12": "PTR",
"13": "HINFO",
"14": "MINFO",
"15": "MX",
"16": "TXT",
"17": "RP",
"18": "AFSDB",
"19": "X25",
"20": "ISDN",
"21": "RT",
"22": "NSAP",
"23": "NSAPPTR",
"24": "SIG",
"25": "KEY",
"26": "PX",
"27": "GPOS",
"28": "AAAA",
"29": "LOC",
"30": "NXT",
"31": "EID",
"32": "NIMLOC",
"33": "SRV",
"34": "ATMA",
"35": "NAPTR",
"36": "KX",
"37": "CERT",
"38": "A6",
"39": "DNAME",
"40": "SINK",
"41": "OPT",
"43": "DS",
"46": "RRSIG",
"47": "NSEC",
"48": "DNSKEY",
"49": "DHCID",
"100": "UINFO",
"101": "UID",
"102": "GID",
"103": "UNSPEC",
"248": "ADDRS",
"249": "TKEY",
"250": "TSIG",
"251": "IXFR",
"252": "AXFR",
"253": "MAILB",
"254": "MAILA",
"255": "ANY",
"65281": "WINS",
"65282": "WINSR",
};
var setProcessNameUsingExe = function (evt) {
setProcessNameFromPath(evt, "process.executable", "process.name");
};
var setParentProcessNameUsingExe = function (evt) {
setProcessNameFromPath(
evt,
"process.parent.executable",
"process.parent.name"
);
};
var setProcessNameFromPath = function (evt, pathField, nameField) {
var name = evt.Get(nameField);
if (name) {
return;
}
var exe = evt.Get(pathField);
evt.Put(nameField, path.basename(exe));
};
var splitCommandLine = function (evt, source, target) {
var commandLine = evt.Get(source);
if (!commandLine) {
return;
}
evt.Put(target, winlogbeat.splitCommandLine(commandLine));
};
var splitProcessArgs = function (evt) {
splitCommandLine(evt, "process.command_line", "process.args");
};
var splitParentProcessArgs = function (evt) {
splitCommandLine(
evt,
"process.parent.command_line",
"process.parent.args"
);
};
var addUser = function (evt) {
var userParts = evt.Get("winlog.event_data.User").split("\\");
if (userParts.length === 2) {
evt.Delete("user");
evt.Put("user.domain", userParts[0]);
evt.Put("user.name", userParts[1]);
evt.AppendTo("related.user", userParts[1]);
evt.Delete("winlog.event_data.User");
}
};
var setRuleName = function (evt) {
var ruleName = evt.Get("winlog.event_data.RuleName");
if (!ruleName || ruleName === "-") {
return;
}
evt.Put("rule.name", ruleName);
evt.Delete("winlog.event_data.RuleName");
};
var addNetworkDirection = function (evt) {
switch (evt.Get("winlog.event_data.Initiated")) {
case "true":
evt.Put("network.direction", "outbound");
break;
case "false":
evt.Put("network.direction", "inbound");
break;
}
evt.Delete("winlog.event_data.Initiated");
};
var addNetworkType = function (evt) {
switch (evt.Get("winlog.event_data.SourceIsIpv6")) {
case "true":
evt.Put("network.type", "ipv6");
break;
case "false":
evt.Put("network.type", "ipv4");
break;
}
evt.Delete("winlog.event_data.SourceIsIpv6");
evt.Delete("winlog.event_data.DestinationIsIpv6");
};
var setRelatedIP = function (evt) {
var sourceIP = evt.Get("source.ip");
if (sourceIP) {
evt.AppendTo("related.ip", sourceIP);
}
var destIP = evt.Get("destination.ip");
if (destIP) {
evt.AppendTo("related.ip", destIP);
}
};
var getHashPath = function (namespace, hashKey) {
if (hashKey === "imphash") {
return namespace + ".pe.imphash";
}
return namespace + ".hash." + hashKey;
};
var emptyHashRegex = /^0*$/;
var hashIsEmpty = function (value) {
if (!value) {
return true;
}
return emptyHashRegex.test(value);
}
// Adds hashes from the given hashField in the event to the 'hash' key
// in the specified namespace. It also adds all the hashes to 'related.hash'.
var addHashes = function (evt, namespace, hashField) {
var hashes = evt.Get(hashField);
evt.Delete(hashField);
hashes.split(",").forEach(function (hash) {
var parts = hash.split("=");
if (parts.length !== 2) {
return;
}
var key = parts[0].toLowerCase();
var value = parts[1].toLowerCase();
if (hashIsEmpty(value)) {
return;
}
var path = getHashPath(namespace, key);
evt.Put(path, value);
evt.AppendTo("related.hash", value);
// TODO: remove in 8.0, see (https://github.com/elastic/beats/issues/18364).
evt.Put("hash." + key, value);
});
};
var splitFileHashes = function (evt) {
addHashes(evt, "file", "winlog.event_data.Hashes");
};
var splitFileHash = function (evt) {
addHashes(evt, "file", "winlog.event_data.Hash");
};
var splitProcessHashes = function (evt) {
addHashes(evt, "process", "winlog.event_data.Hashes");
};
var removeEmptyEventData = function (evt) {
var eventData = evt.Get("winlog.event_data");
if (eventData && Object.keys(eventData).length === 0) {
evt.Delete("winlog.event_data");
}
};
var translateDnsQueryStatus = function (evt) {
var statusCode = evt.Get("sysmon.dns.status");
if (!statusCode) {
return;
}
var statusName = dnsQueryStatusCodes[statusCode];
if (statusName === undefined) {
return;
}
evt.Put("sysmon.dns.status", statusName);
};
// Splits the QueryResults field that contains the DNS responses.
// Example: "type: 5 f2.taboola.map.fastly.net;::ffff:151.101.66.2;::ffff:151.101.130.2;::ffff:151.101.194.2;::ffff:151.101.2.2;"
var splitDnsQueryResults = function (evt) {
var results = evt.Get("winlog.event_data.QueryResults");
if (!results) {
return;
}
results = results.split(";");
var answers = [];
var ips = [];
for (var i = 0; i < results.length; i++) {
var answer = results[i];
if (!answer) {
continue;
}
if (answer.startsWith("type:")) {
var parts = answer.split(/\s+/);
if (parts.length !== 3) {
throw "unexpected QueryResult format";
}
answers.push({
type: dnsRecordTypes[parts[1]],
data: parts[2],
});
} else {
// Convert V4MAPPED addresses.
answer = answer.replace("::ffff:", "");
if (net.isIP(answer)) {
ips.push(answer);
// Synthesize record type based on IP address type.
var type = "A";
if (answer.indexOf(":") !== -1) {
type = "AAAA";
}
answers.push({
type: type,
data: answer,
});
}
}
}
if (answers.length > 0) {
evt.Put("dns.answers", answers);
}
if (ips.length > 0) {
evt.Put("dns.resolved_ip", ips);
}
evt.Delete("winlog.event_data.QueryResults");
};
var parseUtcTime = new processor.Timestamp({
field: "winlog.event_data.UtcTime",
target_field: "winlog.event_data.UtcTime",
timezone: "UTC",
layouts: ["2006-01-02 15:04:05.999"],
tests: ["2019-06-26 21:19:43.237"],
ignore_missing: true,
});
var setAdditionalSignatureFields = function (evt) {
var signed = evt.Get("winlog.event_data.Signed");
if (!signed) {
return;
}
evt.Put("file.code_signature.signed", true);
var signatureStatus = evt.Get("winlog.event_data.SignatureStatus");
evt.Put("file.code_signature.valid", signatureStatus === "Valid");
};
var setAdditionalFileFieldsFromPath = function (evt) {
var filePath = evt.Get("file.path");
if (!filePath) {
return;
}
evt.Put("file.name", path.basename(filePath));
evt.Put("file.directory", path.dirname(filePath));
// path returns extensions with a preceding ., e.g.: .tmp, .png
// according to ecs the expected format is without it, so we need to remove it.
var ext = path.extname(filePath);
if (!ext) {
return;
}
if (ext.charAt(0) === ".") {
ext = ext.substr(1);
}
evt.Put("file.extension", ext);
};
// https://docs.microsoft.com/en-us/windows/win32/sysinfo/registry-hives
var commonRegistryHives = {
HKEY_CLASSES_ROOT: "HKCR",
HKCR: "HKCR",
HKEY_CURRENT_CONFIG: "HKCC",
HKCC: "HKCC",
HKEY_CURRENT_USER: "HKCU",
HKCU: "HKCU",
HKEY_DYN_DATA: "HKDD",
HKDD: "HKDD",
HKEY_LOCAL_MACHINE: "HKLM",
HKLM: "HKLM",
HKEY_PERFORMANCE_DATA: "HKPD",
HKPD: "HKPD",
HKEY_USERS: "HKU",
HKU: "HKU",
};
var qwordRegex = new RegExp(/QWORD \(((0x\d{8})-(0x\d{8}))\)/, "i");
var dwordRegex = new RegExp(/DWORD \((0x\d{8})\)/, "i");
var setRegistryFields = function (evt) {
var path = evt.Get("winlog.event_data.TargetObject");
if (!path) {
return;
}
evt.Put("registry.path", path);
var pathTokens = path.split("\\");
var hive = commonRegistryHives[pathTokens[0]];
if (hive) {
evt.Put("registry.hive", hive);
pathTokens.splice(0, 1);
if (pathTokens.length > 0) {
evt.Put("registry.key", pathTokens.join("\\"));
}
}
var value = pathTokens[pathTokens.length - 1];
evt.Put("registry.value", value);
var data = evt.Get("winlog.event_data.Details");
if (!data) {
return;
}
// sysmon only returns details of a registry modification
// if it's a qword or dword
var dataType;
var dataValue;
var match = qwordRegex.exec(data);
if (match && match.length > 0) {
var parsedHighByte = parseInt(match[2]);
var parsedLowByte = parseInt(match[3]);
if (!isNaN(parsedHighByte) && !isNaN(parsedLowByte)) {
dataValue = "" + ((parsedHighByte << 8) + parsedLowByte);
dataType = "SZ_QWORD";
}
} else {
match = dwordRegex.exec(data);
if (match && match.length > 0) {
var parsedValue = parseInt(match[1]);
if (!isNaN(parsedValue)) {
dataType = "SZ_DWORD";
dataValue = "" + parsedValue;
}
}
}
if (dataType) {
evt.Put("registry.data.strings", [dataValue]);
evt.Put("registry.data.type", dataType);
}
};
// Event ID 1 - Process Create.
var event1 = new processor.Chain()
.Add(parseUtcTime)
.AddFields({
fields: {
category: ["process"],
type: ["start", "process_start"],
},
target: "event",
})
.Convert({
fields: [{
from: "winlog.event_data.UtcTime",
to: "@timestamp",
},
{
from: "winlog.event_data.ProcessGuid",
to: "process.entity_id",
},
{
from: "winlog.event_data.ProcessId",
to: "process.pid",
type: "long",
},
{
from: "winlog.event_data.Image",
to: "process.executable",
},
{
from: "winlog.event_data.CommandLine",
to: "process.command_line",
},
{
from: "winlog.event_data.CurrentDirectory",
to: "process.working_directory",
},
{
from: "winlog.event_data.ParentProcessGuid",
to: "process.parent.entity_id",
},
{
from: "winlog.event_data.ParentProcessId",
to: "process.parent.pid",
type: "long",
},
{
from: "winlog.event_data.ParentImage",
to: "process.parent.executable",
},
{
from: "winlog.event_data.ParentCommandLine",
to: "process.parent.command_line",
},
],
mode: "rename",
ignore_missing: true,
fail_on_error: false,
})
.Add(setRuleName)
.Add(setProcessNameUsingExe)
.Add(splitProcessArgs)
.Add(addUser)
.Add(splitProcessHashes)
.Add(setParentProcessNameUsingExe)
.Add(splitParentProcessArgs)
.Add(removeEmptyEventData)
.Build();
// Event ID 2 - File creation time changed.
var event2 = new processor.Chain()
.Add(parseUtcTime)
.AddFields({
fields: {
category: ["file"],
type: ["change"],
},
target: "event",
})
.Convert({
fields: [{
from: "winlog.event_data.UtcTime",
to: "@timestamp",
},
{
from: "winlog.event_data.ProcessGuid",
to: "process.entity_id",
},
{
from: "winlog.event_data.ProcessId",
to: "process.pid",
type: "long",
},
{
from: "winlog.event_data.Image",
to: "process.executable",
},
{
from: "winlog.event_data.TargetFilename",
to: "file.path",
},
],
mode: "rename",
ignore_missing: true,
fail_on_error: false,
})
.Add(setRuleName)
.Add(setAdditionalFileFieldsFromPath)
.Add(setProcessNameUsingExe)
.Add(removeEmptyEventData)
.Build();
// Event ID 3 - Network connection detected.
var event3 = new processor.Chain()
.Add(parseUtcTime)
.AddFields({
fields: {
category: ["network"],
type: ["connection", "start", "protocol"],
},
target: "event",
})
.Convert({
fields: [{
from: "winlog.event_data.UtcTime",
to: "@timestamp",
},
{
from: "winlog.event_data.ProcessGuid",
to: "process.entity_id",
},
{
from: "winlog.event_data.ProcessId",
to: "process.pid",
type: "long",
},
{
from: "winlog.event_data.Image",
to: "process.executable",
},
{
from: "winlog.event_data.Protocol",
to: "network.transport",
},
{
from: "winlog.event_data.SourceIp",
to: "source.ip",
type: "ip",
},
{
from: "winlog.event_data.SourceHostname",
to: "source.domain",
type: "string",
},
{
from: "winlog.event_data.SourcePort",
to: "source.port",
type: "long",
},
{
from: "winlog.event_data.DestinationIp",
to: "destination.ip",
type: "ip",
},
{
from: "winlog.event_data.DestinationHostname",
to: "destination.domain",
type: "string",
},
{
from: "winlog.event_data.DestinationPort",
to: "destination.port",
type: "long",
},
{
from: "winlog.event_data.DestinationPortName",
to: "network.protocol",
},
],
mode: "rename",
ignore_missing: true,
fail_on_error: false,
})
.Add(setRuleName)
.Add(setRelatedIP)
.Add(setProcessNameUsingExe)
.Add(addUser)
.Add(addNetworkDirection)
.Add(addNetworkType)
.CommunityID()
.Add(removeEmptyEventData)
.Build();
// Event ID 4 - Sysmon service state changed.
var event4 = new processor.Chain()
.Add(parseUtcTime)
.AddFields({
fields: {
category: ["process"],
type: ["change"],
},
target: "event",
})
.Convert({
fields: [{
from: "winlog.event_data.UtcTime",
to: "@timestamp",
}, ],
mode: "rename",
ignore_missing: true,
fail_on_error: false,
})
.Add(removeEmptyEventData)
.Build();
// Event ID 5 - Process terminated.
var event5 = new processor.Chain()
.Add(parseUtcTime)
.AddFields({
fields: {
category: ["process"],
type: ["end", "process_end"],
},
target: "event",
})
.Convert({
fields: [{
from: "winlog.event_data.UtcTime",
to: "@timestamp",
},
{
from: "winlog.event_data.ProcessGuid",
to: "process.entity_id",
},
{
from: "winlog.event_data.ProcessId",
to: "process.pid",
type: "long",
},
{
from: "winlog.event_data.Image",
to: "process.executable",
},
],
mode: "rename",
ignore_missing: true,
fail_on_error: false,
})
.Add(setRuleName)
.Add(setProcessNameUsingExe)
.Add(removeEmptyEventData)
.Build();
// Event ID 6 - Driver loaded.
var event6 = new processor.Chain()
.Add(parseUtcTime)
.AddFields({
fields: {
category: ["driver"],
type: ["start"],
},
target: "event",
})
.Convert({
fields: [{
from: "winlog.event_data.UtcTime",
to: "@timestamp",
},
{
from: "winlog.event_data.ImageLoaded",
to: "file.path",
},
],
mode: "rename",
ignore_missing: true,
fail_on_error: false,
})
.Convert({
fields: [{
from: "winlog.event_data.Signature",
to: "file.code_signature.subject_name",
},
{
from: "winlog.event_data.SignatureStatus",
to: "file.code_signature.status",
},
],
fail_on_error: false,
})
.Add(setRuleName)
.Add(setAdditionalFileFieldsFromPath)
.Add(setAdditionalSignatureFields)
.Add(splitFileHashes)
.Add(removeEmptyEventData)
.Build();
// Event ID 7 - Image loaded.
var event7 = new processor.Chain()
.Add(parseUtcTime)
.AddFields({
fields: {
category: ["process"],
type: ["change"],
},
target: "event",
})
.Convert({
fields: [{
from: "winlog.event_data.UtcTime",
to: "@timestamp",
},
{
from: "winlog.event_data.ProcessGuid",
to: "process.entity_id",
},
{
from: "winlog.event_data.ProcessId",
to: "process.pid",
type: "long",
},
{
from: "winlog.event_data.Image",
to: "process.executable",
},
{
from: "winlog.event_data.ImageLoaded",
to: "file.path",
},
],
mode: "rename",
ignore_missing: true,
fail_on_error: false,
})
.Convert({
fields: [{
from: "winlog.event_data.Signature",
to: "file.code_signature.subject_name",
},
{
from: "winlog.event_data.SignatureStatus",
to: "file.code_signature.status",
},
],
fail_on_error: false,
})
.Add(setRuleName)
.Add(setAdditionalFileFieldsFromPath)
.Add(setAdditionalSignatureFields)
.Add(setProcessNameUsingExe)
.Add(splitFileHashes)
.Add(removeEmptyEventData)
.Build();
// Event ID 8 - CreateRemoteThread detected.
var event8 = new processor.Chain()
.Add(parseUtcTime)
.Convert({
fields: [{
from: "winlog.event_data.UtcTime",
to: "@timestamp",
},
{
from: "winlog.event_data.SourceProcessGuid",
to: "process.entity_id",
},
{
from: "winlog.event_data.SourceProcessId",
to: "process.pid",
type: "long",
},
{
from: "winlog.event_data.SourceImage",