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Appendix B - Epilog Windows Registry Configuration Description

Appendix B - Epilog Windows Registry Configuration Description

Owned by Andrew Madge
Last updated: Dec 03, 2024

The purpose of this section is to discuss the makeup of the configuration items in the registry. The Epilog configuration registry key is located at HKEY_LOCAL_MACHINE\SOFTWARE\Intersect Alliance\Epilog, and this location may not be changed. If the configuration key does not exist, the Epilog service will create it during installation, but will not actively audit events until a correctly formatted at least one log monitor is present. 

Epilog can be configured in several different ways, namely:

  • Via the remote control interface (Recommended).

  • By manually editing the registry (NOT Recommended).
    Note manual editing of the registry location is possible, but care should be taken to ensure that it conforms to the required Snare format.  Failure to specify a correct configuration will not 'crash' the Epilog service, but may result in selected events not being able to be read, and the system not working as specified.

    Any use of the web based Remote Control Interface to modify selected configurations, will result in manual configuration changes being overwritten.

The format of the audit configuration registry subkeys is discussed below.

[Certificate]

This subkey stores SSL/TLS certificates configuration values.

DestinationCertPreference
This value is of type REG_SZ, and defines the required level of SSL/TLS certificate verification when connecting to a remote destination server. 
Note: SSL/TLS certificate verification is not relevant if UDP or TCP protocols are used to connect to the destination.
Accepted values are:
ANY - (Default) Require an SSL/TLS certificate to be presented, but accept the certificate even if the chain of trust cannot be authenticated, or the hostname does not match the presented certificate. This is useful for self-signed certificates.
STRICT - Require an SSL/TLS certificate to be presented, and have both a valid chain of trust and also a hostname matching the certificate. A hostname must be provided in the associated Destination#Host setting, as an IP address will not work.
DestinationCertPreferenceSAM
This value is of type REG_SZ, and defines the required level of SSL/TLS certificate verification when connecting to a Snare Agent Manager server. 
Accepted values are:
ANY - (Default) Require an SSL/TLS certificate to be presented, but accept the certificate even if the chain of trust cannot be authenticated, or the hostname does not match the presented certificate. This is useful for self-signed certificates.
STRICT - Require an SSL/TLS certificate to be presented, and have both a valid chain of trust and also a hostname matching the certificate. A hostname must be provided in the SAM1IP setting, as an IP address will not work.
WebCertID
The thumbprint of the certificate to be used for HTTPS web user interface interactions. 
By default, Snare Agent generates a self-signed certificate. Customer is welcome to replace it with a CA-signed certificate for improved security. 


[Config]
This subkey stores the general configuration values.
AgentLog
This value is of type REG_DWORD and sets the level of tracing sent by the agent.  Values include [0-5] where Fatal (0), Error (1), Warning (2), Info (3), Debug (8), Trace (9).
CachePath
This is the disk cache path where the agent will temporarily save all unsent events if the agent needs to restart. Agent will read and send the events on next start.
Checksum

This value is of type REG_DWORD, and determines whether Epilog includes an MD5 Checksum of the contents of each audit record, with the record in question. Set this value to 0 for no, or 1 for Yes. Will default to FALSE (0) if not set. Note that the checking application will need to strip the final delimiter, plus the MD5 Checksum, from the record before evaluating the record against the checksum.

Clientname

This is the Hostname of the client and is of type REG_SZ. If no value has been set, "hostname" command output will be displayed. Must be no more than 100 chars, otherwise will truncate.

EventSourceId

This is of type REG_SZ and stores the Windows Registry path from where to read the Event Source Id text/value. If the value in EventSourceIdType is 2 (Registry Path), then the text/value in the registry, specified by the path, is included in each event.

EventSourceIdText

This is of type REG_SZ and directly stores the Event Source Id text/value. If the value in EventSourceIdType is 1 (Free Text), then this text/value is included in each event.

EventSourceIdType

This is of type REG_DWORD and stores the option related to specifying Event Source Id: 0(NONE), 1(Free Text), 2(Registry Path).

FileSize
This is the maximum generated size of an output file receiving events. The file is rotated upon reaching this maximum.
HeartBeat

This values is the frequency with which a heartbeat is sent, set in minutes.

HeartBeatFileExport

This value determines whether heartbeats are logged to a file. Set this value to 0 for no, or 1 for Yes.

HeartBeatOutputPath

This is the path where the heartbeat messages are exported to, if selected.

HostGUID
This value is of type REG_SZ. Set to the GUID of the specific network card.
HostIP
This value is of type REG_SZ. Set to the IP address of the specific network card.
IISLogFlush
This value is of type REG_DWORD. Enabling this setting will allow IIS to immediately flush all log messages, allowing Epilog to get them.
TLS13Minimum
This value is of type REG_DWORD. When disabled (0), Snare Agent supports TLS 1.2 and TLS 1.3 for web connections. When enabled (1), TLS 1.2 is explicitly disabled; browsers connecting to the agent website must support at least TLS 1.3 for ssl connections.
Separator
Legacy agent setting required to upgrade agents (if it was set to be the identifier to separate events). Defunct for v5 as now set in Destination Configuration.
UpgradePath

This value is of type REG_SZ.  The automatically generated path in which temporary upgrade files are stored.

UseHostIP
This value is of type REG_DWORD and determines whether Snare should use IP address (as set in HostIP) instead of the hostname in the events' header when sending events. Set this value to 0 for No, or 1 for Yes. Will default to FALSE (0) if not set.
UseUTC

This value is of type REG_DWORD and determines whether Snare should use UTC timestamps instead of the local system time when sending events. Set this value to 0 for no, or 1 for Yes. Will default to FALSE (0) if not set.



[Filter]
This subkey stores all the filtering policies.
Filter# 
(where # is a 
serial number)

This section describes the format of the Filters applied to Log file monitors. Filters are of type REG_SZ (string), and the stored value looks similar to this: 
criticality=1,6,6,6,3,3,0,0,0,0match="*"regex=0state=1uuid=ec27404d-1843-4d58-9617-d25c09f3040c

criticality - ten comma-separated integer values ([0-4],[0-7],[0-7],[0-7],[0-10],[1-10],0,0,0,0) representing event criticality for different event formats. First integer is between 0 and 4 indicating the severity of the event in Snare format: 0 - Clear , 1 - Information, 2 - Warning, 3 - Priority, 4 - Critical. Next 3 values are Syslog for each RFC3164, RFC3164 Alt and RFC5424 formats. Syslog values RFC3164 Alt and RFC5424 are copied from Syslog and not used separately. Values 0-7 denote Emergency, Alert, Critical, Error, Warning, Notice, Info and Debug, respectively. CEF is  0 - 10, 0 is least severe and 10 is most severe. LEEF is  1 - 10, 1 is least severe and 10 is most severe. Last 4 values 0,0,0,0 are reserved and not in use.
match= - a string (if regex = 0) or a regular expression (if regex = 1) to match and INCLUDE. Events matching this filter will be collected. DOS wildcard characters ("*" and "?") can be used when regex = 0, for example: match="*"
or
match!= - a string (if regex = 0) or a regular expression (if regex = 1) to match and EXCLUDE. Events matching this filter will not be collected.
regex - integer indicating whether the match string is a regular expression: 0 - no; 1 - yes
state - an integer representing the state of Filter configuration: 0 - Disabled; 1 - Enabled; 2 - Requiring Service Restart
uuid - a unique 16-byte identifier of this Filter.

See Log Filter Configuration page in this User Guide for more details.



[Network]
This subkey stores the general network configurations.
CacheSize
This value is of type REG_DWORD, and determines the desired count of events in the memory cache. If this is set then CacheSizeM cannot be altered.
CacheSizeM

This value is of type REG_DWORD, and determines the size of the in memory cache. The value must be between 1 and 1024.If this is set then CacheSize cannot be altered.

CheckTime
Number of seconds the agent will internally reload its settings, drop and reestablish network connection. Minimum set time is 300 seconds (5 minutes), maximum is 3600 seconds (1 hour).
Destination1Delimiter

The delimiter to be used in the events written to this network destination, including, tab, comma, vertical bar, space and any custom character.  By default the delimiter is a tab character.

Destination1Format
This value is of type REG_DWORD and is the format in which the events are sent to the destination:
Snare (0), SYSLOG RFC3164 (1), SYSLOG Alt (2), CEF (3), LEEF (4), SYSLOG RFC5424 (5), SNARE V2 (6), SYSLOG JSON (7), DEVO (8), DEVO JSON (9).
Destination1Host
This value is of type REG_SZ and is the IP or hostname of the destination server/SIEM.
Destination1mTLSCertID
This value is of type REG_SZ and is the ID of the client's certificate. Client will present the certificate in mutual TLS communication to prove its identity to the server in communication.
Destination1Port

This value is of type REG_DWORD, and determines the Destination Port number. This value must be in 1-65535 range. Will default to 514 if a SYSLOG header has been specified.

Destination1SocketType
This value is of type REG_DWORD, and determines the protocol used (0 for UDP, 1 for TCP, 2 for TLS/SSL, 3 for TLS_AUTH, 4 for mTLS). This feature only appears in supported agents.
Destination1TLSAuthKey
This value is of type REG_SZ and is used when Destination1SocketType is 3 i.e. TLS_AUTH. 
FileOutput1Delimiter
The delimiter to be used in the events written to this file destination, including, tab, comma, vertical bar, space and any custom character.  By default the delimiter is a tab character.
FileOutput1FileName
The path and location of the file the events are sent to.
FileOutput1Format

The format to write to the log file. Available formats are:

Snare (0), SYSLOG RFC3164 (1), SYSLOG Alt (2), CEF (3), LEEF (4), SYSLOG RFC5424 (5), SNARE V2 (6), SYSLOG JSON (7), DEVO (8), DEVO JSON (9).

NotifyMsgLimit
This value is of type REG_DWORD having value 0 or 1, and determines whether to send or not the EPS notification to server (1 means send and 0 means not to send) whenever agent reaches EPS RateLimit. This feature only appears in supported agents.
NotifyMsgLimitFrequency
This value is of type REG_DWORD, and determines the frequency of events per second notification. The value is treated in minutes and only one EPS notification message is sent to server regardless of how many times agent reaches EPS limit during these minutes. This feature only appears in supported agents.
RateLimit
This value is of type REG_DWORD, and determines the upper limit for events per second (EPS) that the agent will send to server. This feature only appears in supported agents.
SyslogFacility
This value represents the SYSLOG facility for SYSLOG format

SyslogTAGTerminator

This value is of type REG_DWORD, having value of 0 or 1, and determines whether to use TAB as SYSLOG (RFC3164) TAG Terminator. SYSLOG (RFC3164) IEFT standard allows all alphanumeric characters considered the part of TAG. It is strongly recommended to keep it as 1, else Destination#Delimiter will be used as TAG terminator.



[Remote]
This subkey stores all the remote control parameters.
AccessKeyAuth

This is of type REG_SZ, and stores the actual password to be used, in encrypted format.

Allow

"Allow" is of type REG_DWORD, and set to either 0 or 1 to allow remote control If not set or out of bounds, will default to 0/NO (i.e. not able to be remote controlled).

LockTime
This value is of type REG_DWORD and is used to determine the lock duration in minutes after maximum failed login attempts.
MaxFailAttempt
This value is of type REG_DWORD and is used to determine the maximum number of failed login attempts that will be accepted before the agent will be locked for a duration (Duration is defined in LockTime).
Restrict

This value is of type REG_DWORD, and set to either 0 or 1 to signal whether the remote users should be restricted via IP address or not. 0 = no restrictions.

RestrictIP

This is of type REG_SZ and is the IP address set from above.

WebPort

This value is the web server port, if it has been set to something other than port 6162. It is of type REG_DWORD. If not set or out of bounds, it will default to port 6162.



[SAM]
Stores the Snare Agent Manager settings.
SAM1AuthKey
Key used by the agent to communicate with the Snare Agent Manager.
SAM1IP
The IP/hostname of where SAM is installed, that will communicate with the agent.
SAM1Port
The port number the agent uses to communicate with SAM, port 6262.


[State]
This section stores data managed internally by the Agent.
SAMCToken

Token provided by SAM to the agent.

AgentLocked
This value is of type REG_DWORD and is set to either 0 or 1 to indicate whether the agent is locked or not due to reaching maximum failed login attempts.
AgentLockEndTime
This is of type REG_SZ and is used to store the time when the agent will be back to normal after it has been locked due to reaching maximum failed login attempts.
LoginAttempts
This value is of type REG_DWORD and is used to determine the number of consecutive failed login attempts.   


[Log]
This subsection stores the log monitors.
Log# 
(where # is
a serial number)
This section describes the format of the log file monitors. Log monitors are of type REG_SZ (string), and the stored value looks similar to this: 
logtype=0logval=""linetype=0lineval="1"watchtype=0watchval="1"dirfilter="C:\temp\LogFilterTest\*"filefilter="*.txt"features=16state=1uuid=3a53e96d-bf10-4d2d-b5da-455ca8d34ec5

logtype - an integer representing the type of logs being collected: 0 - Generic log format(default); 1 - Apache web logs;  2 - Exchange message tracking logs pre 2007; 3 - Exchange message tracking logs 2007; 4 - Exchange message tracking logs 2010/2013; 5 - Microsoft IIS web server logs; 6 - Microsoft ISA firewall logs; 7 - Microsoft ISA web logs; 8 - Microsoft proxy server logs; 9 - Microsoft SMTP logs; 10 - Squid proxy logs; 11 - VMS Security Logs; 12 - Custom Event log; 13 - Microsoft DNS server logs; 14 - NCR ATM Journal Logs; 15 - DHCP Logs
logval - user-defined string that will be used as a log type in the event header if the logtype = 12 - Custom Event Log.
linetype - an integer defining what comprises a single event: 0 - Single Line (every line in the monitored file is converted to a separate event); 1 - Fixed Number of Lines; 2 - Line separating events (a line specified in lineval acts as event separator)
lineval - if linetype = 1, a string representing the number of lines to be read as one event; if linetype = 2, this is the line that separates events, for example, "<end>". 
watchtype - an integer indicating which files should be monitored in the given directory: 0 - All matching files; 1 - Last matching file (alphabetically); 2 - First matching file (alphabetically); 3 - Fixed number of first matching files; 4 - Fixed number of last matching files
watchval - if watchtype = 3 or 4, a string representing the number of first/last matching files, otherwise "1"
dirfilter - a string representing fully qualified path to the desired log file or the directory containing the target log files
filefilter - a string representing the file name or file name pattern to monitor for new logs
features - an integer representing a bitmap of extra features, such as comments inclusion, date-based or regex-based file matching, etc. This value is set programmatically based on other selections.
state - an integer representing the state of Log file monitor configuration. Disabled = 0, Enabled = 1, Requiring Service Restart = 2.
uuid - a unique 16-byte identifier of this Log file monitor.

See Log Configuration page in this User Guide for more details.