System Monitor (Sysmon) is a Windows system service and devicedriver that, once installed on a system, remains resident across systemreboots to monitor and log system activity to the Windows event log. Itprovides detailed information about process creations, networkconnections, and changes to file creation time. By collecting the eventsit generates usingWindows Event CollectionorSIEMagents and subsequently analyzing them, you can identify malicious oranomalous activity and understand how intruders and malware operate onyour network. The service runs as aprotected process,thus disallowing a wide range of user mode interactions.
On Vista and higher, events are stored inApplications and Services Logs/Microsoft/Windows/Sysmon/Operational, and onolder systems events are written to the System event log.Event timestamps are in UTC standard time.
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The process creation event provides extended information about a newlycreated process. The full command line provides context on the processexecution. The ProcessGUID field is a unique value for this processacross a domain to make event correlation easier. The hash is a fullhash of the file with the algorithms in the HashType field.
The change file creation time event is registered when a file creationtime is explicitly modified by a process. This event helps tracking thereal creation time of a file. Attackers may change the file creationtime of a backdoor to make it look like it was installed with theoperating system. Note that many processes legitimately change thecreation time of a file; it does not necessarily indicate maliciousactivity.
The network connection event logs TCP/UDP connections on the machine. Itis disabled by default. Each connection is linked to a process throughthe ProcessId and ProcessGuid fields. The event also contains the sourceand destination host names IP addresses, port numbers and IPv6 status.
The driver loaded events provides information about a driver beingloaded on the system. The configured hashes are provided as well assignature information. The signature is created asynchronously forperformance reasons and indicates if the file was removed after loading.
The CreateRemoteThread event detects when a process creates a thread inanother process. This technique is used by malware to inject code andhide in other processes. The event indicates the source and targetprocess. It gives information on the code that will be run in the newthread: StartAddress, StartModule and StartFunction. Note thatStartModule and StartFunction fields are inferred, they might be emptyif the starting address is outside loaded modules or known exportedfunctions.
The RawAccessRead event detects when a process conducts readingoperations from the drive using the \\.\ denotation. This techniqueis often used by malware for data exfiltration of files that are lockedfor reading, as well as to avoid file access auditing tools. The eventindicates the source process and target device.
File create operations are logged when a file is created or overwritten.This event is useful for monitoring autostart locations, like theStartup folder, as well as temporary and download directories, which arecommon places malware drops during initial infection.
This event logs when a named file stream is created, and it generatesevents that log the hash of the contents of the file to which the streamis assigned (the unnamed stream), as well as the contents of the namedstream. There are malware variants that drop their executables orconfiguration settings via browser downloads, and this event is aimed atcapturing that based on the browser attaching a Zone.Identifier "mark ofthe web" stream.
This event is generated when a process executes a DNS query, whether the resultis successful or fails, cached or not. The telemetry for this event was addedfor Windows 8.1 so it is not available on Windows 7 and earlier.
A file was deleted. Additionally to logging the event, the deleted file is alsosaved in the ArchiveDirectory (which is C:\Sysmon by default). Under normaloperating conditions this directory might grow to an unreasonable size - seeevent ID 26: FileDeleteDetected for similar behavior but without saving thedeleted files.
This event is generated when an error occurred within Sysmon. They canhappen if the system is under heavy load and certain tasks could not beperformed or a bug exists in the Sysmon service, or even if certain securityand integrity conditions are not met. You can report any bugson the Sysinternals forum or over Twitter(@markrussinovich).
Configuration files can be specified after the -i (installation) or-c (installation) configuration switches. They make it easier todeploy a preset configuration and to filter captured events.
The configuration file contains a schemaversion attribute on the Sysmontag. This version is independent from the Sysmon binary version andallows the parsing of older configuration files. You can get the currentschema version by using the "-? config" command line. Configurationentries are directly under the Sysmon tag and filters are under theEventFiltering tag.
Event filtering allows you to filter generated events. In many casesevents can be noisy and gathering everything is not possible. Forexample, you might be interested in network connections only for acertain process, but not all of them. You can filter the output on thehost reducing the data to collect.
The onmatch filter is applied if events are matched. It can be changedwith the onmatch attribute for the filter tag. If the value is"include", it means only matched events are included. If it is set to"exclude", the event will be included except if a rule match. You canspecify both an include filter set and an exclude filter set for eachevent ID, where exclude matches take precedence.
Each filter can include zero or more rules. Each tag under the filtertag is a field name from the event. Rules that specify a condition forthe same field name behave as OR conditions, and ones that specifydifferent field name behave as AND conditions. Field rules can also useconditions to match a value. The conditions are as follows (all are caseinsensitive):
In the sample configuration shown earlier, the networking filter uses both aninclude and exclude rule to capture activity to port 80 and 443 by all processesexcept those that have iexplore.exe in their name.
The following example demonstrates this usage. In the first rule group, aprocess create event will be generated when timeout.exe is executed only witha command line argument of 100, but a process terminate event will begenerated for the termination of ping.exe and timeout.exe.
Authentication protocols supporting mutual authentication such as Kerberos can't be used unless all the instances of the services use the same principal. For example, when a client computer connects to a service that uses load balancing or another method where all the servers appear to be the same service to the client. Meaning each service has to use the same passwords or keys to prove their identity. Group Managed Service Accounts (gMSA) are a type of account that can be used with multiple servers. A gMSA is a domain account that can be used to run services on multiple servers without having to manage the password. The gMSA provides automatic password management and simplified service principal name (SPN) management, including delegation of management to other administrators.
Failover clusters do not support gMSAs. However, services that run on top of the Cluster service can use a gMSA or a sMSA if they are a Windows service, an App pool, a scheduled task, or natively support gMSA or sMSA.
A Windows computer account, a Windows standalone Managed Service Account (sMSA), or virtual accounts can't be shared across multiple systems. When you use virtual accounts, the identity is also local to the machine and not recognized by the domain. If you configure one account for services on server farms to share, you would have to choose a user account or a computer account apart from a Windows system. Either way, these accounts don't have the capability of single-point-of-control password management. Without password management, each organization needs to update keys for the service in Active Directory and distribute these keys to all instances of those services.
With Windows Server, services and service administrators don't need to manage password synchronization between service instances when using group Managed Service Accounts (gMSA). You create the gMSA in AD and then configure the service that supports Managed Service Accounts. Use of the gMSA is scoped to any machine that is able to use LDAP to retrieve the gMSA's credentials. You can create a gMSA using the New-ADServiceAccount cmdlets that are part of the Active Directory module. The following services support the service identity configuration on the host.
The Active Directory domain and forest functional level must be Windows Server 2012 or later. To learn more about updating the schema, see Raising the Active Directory domain and forest functional levels.
The Key Distribution Services (KDS) Root Key for Active Directory must be created in the domain. The result of its creation can be verified in the KdsSvc Operational log, Event ID 4004. To learn more about creating the KDS root key, see Create the Key Distribution Services KDS Root Key.
You can create a gMSA only if the forest schema is Windows Server 2012 or later. You must also deploy the KDS Root Key for Active Directory, and have at least one Windows Server 2012 or later domain controller in the domain where you want to create a gMSA.
A value for the -Name parameter is always required (whether you specify -Name or not), with -DNSHostName, -RestrictToSingleComputer, and -RestrictToOutboundAuthentication being secondary requirements for the three deployment scenarios.
For example, to create a new gMSA called ITFarm1 for the group use the following command. The gMSA allows the service to use the Kerberos encryption types RC4, AES128, and AES256. The service is allowed to use the SPNs http/ITFarm1.contoso.com/contoso.com, http/ITFarm1.contoso.com/contoso, http/ITFarm1/contoso.com, and http/ITFarm1/contoso.
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