Windows: WinDivert Driver Load

Rule ID

PH_Rule_SIGMA_913

Default Status

Enabled

Description

Detects the load of the Windiver driver, a powerful user-mode capture/sniffing/modification/blocking/re-injection package for Windows. This rule is adapted from https://github.com/SigmaHQ/sigma/blob/master/rules/windows/driver_load/driver_load_win_windivert.yml

Severity

MITRE ATT&CK® Tactics

Defense Evasion

Defense Evasion consists of techniques that adversaries use to avoid detection throughout their compromise. Techniques used for defense evasion include uninstalling/disabling security software or obfuscating/encrypting data and scripts. Adversaries also leverage and abuse trusted processes to hide and masquerade their malware. Other tactics’ techniques are cross-listed here when those techniques include the added benefit of subverting defenses.

https://attack.mitre.org/tactics/TA0005

MITRE ATT&CK® Techniques

T1599.001

Network Boundary Bridging: Network Address Translation Traversal

Adversaries may bridge network boundaries by modifying a network device's Network Address Translation (NAT) configuration. Malicious modifications to NAT may enable an adversary to bypass restrictions on traffic routing that otherwise separate trusted and untrusted networks. When an adversary gains control of a network boundary device, they can either leverage existing NAT configurations to send traffic between two separated networks, or they can implement NAT configurations of their own design. Adversaries may use Patch System Image to change the operating system of a network device, implementing their own custom NAT mechanisms to further obscure their activities.

https://attack.mitre.org/techniques/T1599/001

Impacts

Server

Data Source

Windows Sysmon via FortiSIEM Agent

Detection

Correlation

Remediation Guidance

No remediation guidance specified

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.

Filter

SubPattern Definitions

SubPattern Name: Filter

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="Win-Sysmon-6-Driver-Loaded" AND (loadedProcName REGEXP ".*\\NordDivert\.sys.*|.*\\WinDivert64\.sys.*|.*\\WinDivert\.sys.*|.*\\eswfp\.sys.*|.*\\lingtiwfp\.sys.*" OR hashCode REGEXP ".*IMPHASH=0604bb7cb4bb851e2168d5c7d9399087.*|.*IMPHASH=0ea54f8c9af4a2fe8367fa457f48ed38.*|.*IMPHASH=2a5f85fe4609461c6339637594fa9b0a.*|.*IMPHASH=2e5f0e649d97f32b03c09e4686d0574f.*|.*IMPHASH=45ee545ae77e8d43fc70ede9efcd4c96.*|.*IMPHASH=52f8aa269f69f0edad9e8fcdaedce276.*|.*IMPHASH=58623490691babe8330adc81cd04a663.*|.*IMPHASH=6b2c6f95233c2914d1d488ee27531acc.*|.*IMPHASH=8ee39b48656e4d6b8459d7ba7da7438b.*|.*IMPHASH=9d519ae0a0864d6d6ae3f8b6c9c70af6.*|.*IMPHASH=9f2fdd3f9ab922bbb0560a7df46f4342.*|.*IMPHASH=a1b2e245acd47e4a348e1a552a02859a.*|.*IMPHASH=a66b476c2d06c370f0a53b5537f2f11e.*|.*IMPHASH=a74929edfc3289895e3f2885278947ae.*|.*IMPHASH=bdcd836a46bc2415773f6b5ea77a46e4.*|.*IMPHASH=c0e5d314da39dbf65a2dbff409cc2c76.*|.*IMPHASH=c28cd6ccd83179e79dac132a553693d9.*|.*IMPHASH=d8a719865c448b1bd2ec241e46ac1c88.*" OR hashIMP IN ("0604bb7cb4bb851e2168d5c7d9399087","0ea54f8c9af4a2fe8367fa457f48ed38","2a5f85fe4609461c6339637594fa9b0a","2e5f0e649d97f32b03c09e4686d0574f","45ee545ae77e8d43fc70ede9efcd4c96","52f8aa269f69f0edad9e8fcdaedce276","58623490691babe8330adc81cd04a663","6b2c6f95233c2914d1d488ee27531acc","8ee39b48656e4d6b8459d7ba7da7438b","9d519ae0a0864d6d6ae3f8b6c9c70af6","9f2fdd3f9ab922bbb0560a7df46f4342","a1b2e245acd47e4a348e1a552a02859a","a66b476c2d06c370f0a53b5537f2f11e","a74929edfc3289895e3f2885278947ae","bdcd836a46bc2415773f6b5ea77a46e4","c0e5d314da39dbf65a2dbff409cc2c76","c28cd6ccd83179e79dac132a553693d9","d8a719865c448b1bd2ec241e46ac1c88"))

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

hashCode,hashIMP,hostName,loadedProcName

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

hashCode = Filter.hashCode,
hashIMP = Filter.hashIMP,
hostName = Filter.hostName,
loadedProcName = Filter.loadedProcName

FortiSIEM Rules