Network Boundary Bridging T1599

Tactic: Defense Impairment

Adversaries may bridge network boundaries by compromising perimeter network devices or internal devices responsible for network segmentation. Breaching these devices may enable an adversary to bypass restrictions on traffic routing that otherwise separate trusted and untrusted networks.

Events covered

1 catalog event is tagged with this technique by at least one rule.

ProviderEventTitle
SysmonEvent ID 6Driver loaded

Authoring guide

These 7 rules share fields, values, and exclusions.

Fields filtered most (13 distinct)

These fields appear most often in rule filters.

FieldRulesHowSample values
Hashes1contains 1IMPHASH=0604bb7cb4bb851e2168d5c7d9399087, IMPHASH=0ea54f8c9af4a2fe8367fa457f48ed38, IMPHASH=2a5f85fe4609461c6339637594fa9b0a
ImageLoaded1contains 1\NordDivert.sys, \WinDivert.sys, \WinDivert64.sys
SyslogMessage1contains 1VCF Drop, packet too big
aws::errorCode1eq 1VpceAccessDenied
aws::eventSource1in 1cloudtrail.amazonaws.com, ec2.amazonaws.com, kms.amazonaws.com
aws::userIdentity.type1eq 1AWSAccount
input_tokens1ge 12000
recipientAccountId1is_not_null 1
session_user1is_not_null 1
sourcetype1eq 1json_no_timestamp
userIdentity1contains 1principalId
userIdentity.accountId1is_not_null 1
user_arn1is_not_null 1, length_compare 1, 10, >

Top indicator values (41 distinct)

These values appear most often in rule predicates.

FieldKindValueRules (here)Corpus reach
Hashescontains
IMPHASH=0604bb7cb4bb851e2168d5c7d9399087
1
Hashescontains
IMPHASH=0ea54f8c9af4a2fe8367fa457f48ed38
1
Hashescontains
IMPHASH=2a5f85fe4609461c6339637594fa9b0a
1
Hashescontains
IMPHASH=2e5f0e649d97f32b03c09e4686d0574f
1
Hashescontains
IMPHASH=45ee545ae77e8d43fc70ede9efcd4c96
1
Hashescontains
IMPHASH=52f8aa269f69f0edad9e8fcdaedce276
1
Hashescontains
IMPHASH=58623490691babe8330adc81cd04a663
1
Hashescontains
IMPHASH=6b2c6f95233c2914d1d488ee27531acc
1
Hashescontains
IMPHASH=8ee39b48656e4d6b8459d7ba7da7438b
1
Hashescontains
IMPHASH=9d519ae0a0864d6d6ae3f8b6c9c70af6
1
Hashescontains
IMPHASH=9f2fdd3f9ab922bbb0560a7df46f4342
1
Hashescontains
IMPHASH=a1b2e245acd47e4a348e1a552a02859a
1
Hashescontains
IMPHASH=a66b476c2d06c370f0a53b5537f2f11e
1
Hashescontains
IMPHASH=a74929edfc3289895e3f2885278947ae
1
Hashescontains
IMPHASH=bdcd836a46bc2415773f6b5ea77a46e4
1
Hashescontains
IMPHASH=c0e5d314da39dbf65a2dbff409cc2c76
1
Hashescontains
IMPHASH=c28cd6ccd83179e79dac132a553693d9
1
Hashescontains
IMPHASH=d8a719865c448b1bd2ec241e46ac1c88
1
ImageLoadedcontains
\NordDivert.sys
1
ImageLoadedcontains
\WinDivert.sys
1
ImageLoadedcontains
\WinDivert64.sys
1
ImageLoadedcontains
\eswfp.sys
1
ImageLoadedcontains
\lingtiwfp.sys
1
SyslogMessagecontains
VCF Drop
12
SyslogMessagecontains
packet too big
1
aws::errorCodeeq
VpceAccessDenied
1
aws::eventSourcein
cloudtrail.amazonaws.com
1
aws::eventSourcein
ec2.amazonaws.com
1
aws::eventSourcein
kms.amazonaws.com
1
aws::eventSourcein
s3.amazonaws.com
1

Exclusions (3 distinct)

These values appear most often in top-level exclusions.

Rules under this technique

These vendors publish rules tagged with this technique.

Platform (all)
Domain (all)

Sigma 1 rule

Splunk 1 rule

Kusto 1 rule

Panther 4 rules