FortiSIEM Rules

Outbreak: SUNBURST Suspicious File Hash match by Source and Destination

Rule ID

PH_Rule_TH_ES_WINDOWS_12

Default Status

Disabled

Description

Detects SUNBURST Suspicious File Hash match

Severity

9

Category

Security

MITRE ATT&CK® Tactics

Command And Control

MITRE ATT&CK® Techniques


T1095

Non-Application Layer Protocol

Adversaries may use a non-application layer protocol for communication between host and C2 server or among infected hosts within a network. The list of possible protocols is extensive but Specific examples include use of network layer protocols, such as the Internet Control Message Protocol (ICMP), transport layer protocols, such as the User Datagram Protocol (UDP), session layer protocols, such as Socket Secure (SOCKS), as well as redirected/tunneled protocols, such as Serial over LAN (SOL).

https://attack.mitre.org/techniques/T1095

Impacts

Network

Data Source

FortiGate via Syslog, FortiSandbox via Syslog, Windows Sysmon via FortiSIEM Agent

Detection

Correlation

Remediation Guidance

Check if the source is patched for the CVE associated with the event. If yes then remove the host from the network and patch immediately. If host is not scanned then determine if the host is running the affected version of the application. If yes then patch immediately, else it is likely a false positive.

Time Window

If the following pattern or patterns match an ingested event within the given time window in seconds, trigger an incident.

300 seconds

Trigger Conditions

If the following defined pattern/s occur within a 300 second time window.

Sunburst

SubPattern Definitions

SubPattern Name: Sunburst

This is the named definition of the event query, this is important if multiple subpatterns are defined to distinguish them.

SubPattern Query

This is the query logic that matches incoming events

( eventType IN ("Win-Sysmon-15-FileCreateStreamHash","FortiSandbox-Malware-Detected","FortiSandbox-NetAlert-Attack","FortiSandbox-NetAlert-Botnet","FortiGate-antivirus-file-monitored","FortiGate-antivirus-file-intercepted")  OR  eventType CONTAIN "FortiGate-" ) AND ( hashMD5 IN ("E18A6A21EB44E77CA8D739A72209C370","6FFE608A0A43054F850001D4AC31E76F","3E329A4C9030B26BA152FB602A1D5893","02AF7CEC58B9A5DA1C542B5A32151BA1","b91ce2fa41029f6955bff20079468448","02af7cec58b9a5da1c542b5a32151ba1","2c4a910a1299cdae2a4e55988a2f102e","846e27a652a5e1bfbd0ddd38a16dc865","4f2eb62fa529c0283b28d05ddd311fae","56ceb6d0011d87b6e4d7023d7ef85676","B91CE2FA41029F6955BFF20079468448","846E27A652A5E1BFBD0DDD38A16DC865","56CEB6D0011D87B6E4D7023D7EF85676","2C4A910A1299CDAE2A4E55988A2F102E")  OR  hashSHA1 IN ("22719783B2469AD312A40C1B200DD24D6A03618D","5E643654179E8B4CFE1D3C1906A90A4C8D611CEA","1B476F58CA366B54F34D714FFCE3FD73CC30DB1A","BCB5A4DCBC60D26A5F619518F2CFC1B4BB4E4387","E257236206E99F5A5C62035C9C59C57206728B28","6FDD82B7CA1C1F0EC67C05B36D14C9517065353B","1ACF3108BF1E376C8848FBB25DC87424F2C2A39C","76640508B1E7759E548771A5359EAED353BF1EEC","2F1A5A7411D015D01AAEE4535835400191645023","D130BD75645C2433F88AC03E73395FBA172EF676","76640508B1E7759E548771A5359EAED353BF1EEC","2F1A5A7411D015D01AAEE4535835400191645023")  OR  hashCode IN ("C20FD967D64E9722D840EC4292645B65896D0EE3EBE31090E15C5312D889C89E","AD2FBF4ADD71F61173975989D1A18395AFB8538ED889012B9D2E21C19E98BBD1","38385A81664CE562A6777FA4564AE7B93F38F1224E1206550136E2B6B5DBB9DD","D0D626DEB3F9484E649294A8DFA814C5568F846D5AA02D4CDAD5D041A29D5600","CE77D116A074DAB7A22A0FD4F2C1AB475F16EEC42E1DED3C0B0AA8211FE858D6","C15ABAF51E78CA56C0376522D699C978217BF041A3BD3C71D09193EFA5717C71","32519B85C0B422E4656DE6E6C41878E95FD95026267DAAB4215EE59C107D6C77","292327E5C94AFA352CC5A02CA273DF543F2020D0E76368FF96C84F4E90778712","019085A76BA7126FFF22770D71BD901C325FC68AC55AA743327984E89F4B0134","80579DF2533D54FE9CBC87AED80884F6A97E1CCDD0443CE2BCB815EF59ED3D65","402211700C275A7CB15341BD78DA9ADCD7D514A7EA3D76C067E29A7248A92F91","d3c6785e18fba3749fb785bc313cf8346182f532c59172b69adfb31b96a5d0af","a25cadd48d70f6ea0c4a241d99c5241269e6faccb4054e62d16784640f8e53bc","ac1b2b89e60707a20e9eb1ca480bc3410ead40643b386d624c5d21b47c02917c","c09040d35630d75dfef0f804f320f8b3d16a481071076918e9b236a321c1ea77","eb6fab5a2964c5817fb239a7a5079cabca0a00464fb3e07155f28b0a57a2c0ed","dab758bf98d9b36fa057a66cd0284737abf89857b73ca89280267ee7caf62f3b","53F8DFC65169CCDA021B72A62E0C22A4DB7C4077F002FA742717D41B3C40F2C7","D0D626DEB3F9484E649294A8DFA814C5568F846D5AA02D4CDAD5D041A29D5600","CE77D116A074DAB7A22A0FD4F2C1AB475F16EEC42E1DED3C0B0AA8211FE858D6","C15ABAF51E78CA56C0376522D699C978217BF041A3BD3C71D09193EFA5717C71","32519B85C0B422E4656DE6E6C41878E95FD95026267DAAB4215EE59C107D6C77","292327E5C94AFA352CC5A02CA273DF543F2020D0E76368FF96C84F4E90778712","019085A76BA7126FFF22770D71BD901C325FC68AC55AA743327984E89F4B0134","80579DF2533D54FE9CBC87AED80884F6A97E1CCDD0443CE2BCB815EF59ED3D65")  OR  hashSHA256 IN ("C20FD967D64E9722D840EC4292645B65896D0EE3EBE31090E15C5312D889C89E","AD2FBF4ADD71F61173975989D1A18395AFB8538ED889012B9D2E21C19E98BBD1","38385A81664CE562A6777FA4564AE7B93F38F1224E1206550136E2B6B5DBB9DD","D0D626DEB3F9484E649294A8DFA814C5568F846D5AA02D4CDAD5D041A29D5600","CE77D116A074DAB7A22A0FD4F2C1AB475F16EEC42E1DED3C0B0AA8211FE858D6","C15ABAF51E78CA56C0376522D699C978217BF041A3BD3C71D09193EFA5717C71","32519B85C0B422E4656DE6E6C41878E95FD95026267DAAB4215EE59C107D6C77","292327E5C94AFA352CC5A02CA273DF543F2020D0E76368FF96C84F4E90778712","019085A76BA7126FFF22770D71BD901C325FC68AC55AA743327984E89F4B0134","80579DF2533D54FE9CBC87AED80884F6A97E1CCDD0443CE2BCB815EF59ED3D65","402211700C275A7CB15341BD78DA9ADCD7D514A7EA3D76C067E29A7248A92F91","d3c6785e18fba3749fb785bc313cf8346182f532c59172b69adfb31b96a5d0af","a25cadd48d70f6ea0c4a241d99c5241269e6faccb4054e62d16784640f8e53bc","ac1b2b89e60707a20e9eb1ca480bc3410ead40643b386d624c5d21b47c02917c","c09040d35630d75dfef0f804f320f8b3d16a481071076918e9b236a321c1ea77","eb6fab5a2964c5817fb239a7a5079cabca0a00464fb3e07155f28b0a57a2c0ed","dab758bf98d9b36fa057a66cd0284737abf89857b73ca89280267ee7caf62f3b","53F8DFC65169CCDA021B72A62E0C22A4DB7C4077F002FA742717D41B3C40F2C7","D0D626DEB3F9484E649294A8DFA814C5568F846D5AA02D4CDAD5D041A29D5600","CE77D116A074DAB7A22A0FD4F2C1AB475F16EEC42E1DED3C0B0AA8211FE858D6","C15ABAF51E78CA56C0376522D699C978217BF041A3BD3C71D09193EFA5717C71","32519B85C0B422E4656DE6E6C41878E95FD95026267DAAB4215EE59C107D6C77","292327E5C94AFA352CC5A02CA273DF543F2020D0E76368FF96C84F4E90778712","019085A76BA7126FFF22770D71BD901C325FC68AC55AA743327984E89F4B0134","80579DF2533D54FE9CBC87AED80884F6A97E1CCDD0443CE2BCB815EF59ED3D65") )

Group by Attributes

This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID

destIpAddr,srcIpAddr

Aggregate Constraint

This is most typically a numerical constraint that defines when the rule should trigger an incident

COUNT(*) >= 1

Incident Attribute Mapping

This section defines which fields in matching raw events should be mapped to the incident attributes in the resulting incident.

The available raw event attributes to map are limited to the group by attributes and the aggregate event constraint fields for each subpattern

 srcIpAddr=Sunburst.srcIpAddr,
destIpAddr=Sunburst.destIpAddr