t1566 | LoFP

t1566

Title	Tags
a user authenticating via the device code flow for the first time from a new but legitimate network, such as travel, a new home or office isp, a corporate vpn, or a mobile carrier. device code authentication is expected when enrolling or signing in on input-constrained devices (smart tvs, kiosks, iot, conference room devices) and for some cli or headless developer workflows. review the source asn, geolocation, and the user's prior device code history to confirm whether the origin is plausible before escalating.	t1078 t1550 t1566 o365 elastic
a user legitimately using the device code flow for the first time on a personal or otherwise non-compliant device, such as a smart tv, kiosk, iot device, conference room device, or a personal laptop for a cli or headless developer workflow. review the source asn, geolocation, application, and the user's device posture to confirm whether the activity is expected before escalating.	t1078 t1550 t1566 o365 elastic
all kind of software downloads	t1203 t1204 t1204.002 t1566 sigma
all kinds of software downloads	t1203 t1204 t1204.002 t1566 sigma
business workflows that occur very occasionally, and involve a business relationship with an organization in a country that does not routinely appear in network events, can trigger this alert. a new business workflow with an organization in a country with which no workflows previously existed may trigger this alert - although the model will learn that the new destination country is no longer anomalous as the activity becomes ongoing. business travelers who roam to many countries for brief periods may trigger this alert.	t1041 t1048 t1071 t1105 t1204 t1566 ml elastic
cases in which a user mounts an image file for legitimate reasons	t1566 t1566.001 windows sigma
developers testing new applications or oauth flows in non-production tenants may generate alerts during development cycles.	t1078 t1098 t1213 t1566 azure elastic
file located in the appdata folder with trusted signature	t1566 t1566.001 windows sigma
google workspace users typically share drive resources with a shareable link where parameters are edited to indicate when it is viewable or editable by the intended recipient. it is uncommon for a user in an organization to manually copy a drive object from an external drive to their corporate drive. this may happen where users find a useful spreadsheet in a public drive, for example, and replicate it to their drive. it is uncommon for the copied object to execute a container-bound script either unless the user was intentionally aware, suggesting the object uses container-bound scripts to accomplish a legitimate task.	t1098 t1204 t1566 google_workspace elastic
initial sso configuration issues or first-time federation setup errors for legitimate users may trigger this detection. temporary federation service outages affecting multiple users simultaneously.	t1078 t1528 t1566 t1606 o365 elastic
legitimate automation, sdks, or custom applications that obtain tokens through the microsoft authentication broker against graph, azure ad, or device registration service may use non-browser user agents. baseline approved service principals, managed identities, and developer tooling before tuning exclusions for known automation patterns.	t1078 t1539 t1566 azure elastic
legitimate cases in which archives contain iso or img files and the user opens the archive and the image via clicking and not extraction	t1566 windows sigma
legitimate device registrations using microsoft authentication broker may occur during corporate enrollment scenarios or bulk provisioning, but it is uncommon for multiple source ips to register the same identity across microsoft graph, device registration service (drs), and azure active directory (aad) in a short time span.	t1078 t1528 t1550 t1566 azure elastic
legitimate external partners or managed service providers with help desk-style display names may trigger this rule. validate the sender tenant, domain, and business relationship before closing as benign.	t1566 o365 elastic
legitimate files reported by the users	t1566 o365 elastic
legitimate macro files downloaded from the internet	t1566 t1566.001 windows sigma
legitimate macro files sent as attachments via emails	t1566 t1566.001 windows sigma
legitimate node.js or undici-based automation, health checks, or internal services that use the microsoft authentication broker or the same first-party application ids against graph or exchange may match. developers using axios or undici with delegated flows can also resemble this pattern.	t1539 t1566 azure o365 elastic
legitimate usage of hdiutil by administrators and users.	t1560 t1560.001 t1566 t1566.001 macos sigma
legitimate use of device code flow where a user authenticates via browser for a cli tool or headless application. common legitimate scenarios include azure cli, azure powershell, or vs code remote development. review the user agent combinations - browser + known cli tool from the same user may be expected behavior.	t1078 t1528 t1566 azure elastic
legitimate used of encrypted zip files	t1027 t1036 t1105 t1566 t1566.001 windows sigma
legitimate users may have to use ssm to perform actions against machines in the cloud to update or maintain them	t1566 t1566.002 aws sigma
new legitimate applications or integrations recently deployed in the environment may trigger this detection during initial setup or rollout phases.	t1078 t1098 t1213 t1566 azure elastic
opening of headers or footers in email signatures that include svg images or legitimate svg attachments	t1566 t1566.001 windows sigma
organizations that use azure monitor alert rules with financial or billing related naming conventions for legitimate infrastructure monitoring may trigger this rule. review the email subject and recipient to determine if the alert originates from a known internal azure subscription.	t1566 microsoft_exchange_online_message_trace elastic
potential fp by sysadmin opening a zip file containing a legitimate iso file	t1566 t1566.001 windows sigma
rare legitimate interactive device code flows that use the microsoft authentication broker against exchange, graph, or yammer may match, for example during troubleshooting or specialized kiosk setups. document approved scenarios and exclude known principals or networks.	t1078 t1550 t1566 azure elastic
security researchers, sandbox detonations, or red team engagements that intentionally run the kali365 client against a monitored tenant may generate this user agent. document approved research activity and exclude the associated principals, source ips, or tenants if expected.	t1078 t1528 t1550 t1566 azure elastic
signals are generated by microsoft defender for office 365. false-positives may occur if legitimate user activity is misclassified as a threat.	t1204 t1566 rules_building_block elastic
software installation iso files	t1566 t1566.001 windows sigma
there are legitimate uses of ssm to send commands to ec2 instances	t1566 t1566.002 aws sigma
third-party saas applications with sharepoint integration may appear as new app ids when users first authorize access.	t1078 t1098 t1213 t1566 azure elastic
this will alert on legitimate macro usage as well, additional tuning is required	t1566 t1566.001 windows sigma
unknown	t1003 t1003.001 t1003.002 t1003.003 t1003.004 t1003.006 t1005 t1008 t1010 t1012 t1018 t1020 t1021 t1021.001 t1021.002 t1021.003 t1021.005 t1021.006 t1027 t1027.001 t1027.003 t1027.004 t1027.005 t1027.009 t1027.010 t1033 t1036 t1036.003 t1036.005 t1036.007 t1040 t1046 t1047 t1048 t1048.003 t1049 t1053 t1053.002 t1053.005 t1055 t1055.001 t1055.003 t1055.009 t1055.011 t1055.012 t1056 t1056.001 t1057 t1059 t1059.001 t1059.002 t1059.003 t1059.004 t1059.005 t1059.006 t1059.007 t1068 t1069 t1069.001 t1069.002 t1069.003 t1070 t1070.003 t1070.004 t1070.005 t1070.006 t1071 t1071.001 t1071.004 t1072 t1074 t1074.001 t1078 t1078.001 t1078.002 t1078.003 t1078.004 t1082 t1083 t1087 t1087.001 t1087.002 t1087.004 t1090 t1090.001 t1090.003 t1095 t1098 t1102 t1102.001 t1102.003 t1105 t1106 t1110 t1110.001 t1112 t1113 t1114 t1114.001 t1115 t1119 t1123 t1127 t1127.001 t1133 t1134 t1134.001 t1134.002 t1134.003 t1135 t1136 t1136.001 t1136.002 t1137 t1137.002 t1137.006 t1140 t1176 t1176.001 t1185 t1187 t1190 t1195 t1195.001 t1197 t1199 t1200 t1201 t1202 t1203 t1204 t1204.001 t1204.002 t1204.004 t1207 t1210 t1211 t1212 t1216 t1216.001 t1217 t1218 t1218.001 t1218.002 t1218.003 t1218.005 t1218.007 t1218.009 t1218.010 t1218.011 t1218.013 t1219 t1219.002 t1220 t1222 t1222.001 t1482 t1484 t1485 t1486 t1489 t1490 t1491 t1491.001 t1497 t1497.001 t1498 t1499 t1499.004 t1505 t1505.003 t1505.004 t1518 t1518.001 t1526 t1528 t1529 t1531 t1537 t1539 t1543 t1543.001 t1543.003 t1543.004 t1546 t1546.001 t1546.002 t1546.003 t1546.007 t1546.008 t1546.009 t1546.010 t1546.011 t1546.012 t1546.015 t1547 t1547.001 t1547.003 t1547.004 t1547.005 t1547.006 t1547.008 t1547.009 t1547.010 t1548 t1548.002 t1552 t1552.001 t1552.002 t1552.004 t1552.006 t1553 t1553.004 t1554 t1555 t1555.003 t1555.004 t1555.005 t1556 t1556.002 t1557 t1557.001 t1557.003 t1558 t1558.003 t1559 t1559.001 t1559.002 t1560 t1560.001 t1563 t1563.002 t1564 t1564.001 t1564.002 t1564.003 t1564.004 t1565 t1566 t1566.001 t1566.002 t1567 t1567.002 t1569 t1569.002 t1571 t1572 t1573 t1574 t1574.001 t1574.005 t1574.006 t1574.008 t1574.011 t1584 t1587 t1587.001 t1588 t1588.001 t1588.002 t1593 t1593.003 t1595 t1608 t1609 t1611 t1614 t1614.001 t1615 t1620 t1621 t1649 t1685 t1685.001 t1685.005 t1686 t1686.003 cisco zeek windows macos rpc_firewall kubernetes okta onelogin linux gcp azure aws m365 sigma
unlikely	t1003 t1003.001 t1003.002 t1003.003 t1003.004 t1003.005 t1003.006 t1005 t1007 t1008 t1012 t1014 t1016 t1018 t1021 t1021.001 t1021.002 t1021.003 t1021.006 t1027 t1027.005 t1027.010 t1033 t1036 t1036.003 t1036.005 t1036.007 t1041 t1046 t1047 t1048 t1048.001 t1053 t1053.003 t1053.005 t1055 t1055.001 t1055.012 t1056 t1057 t1059 t1059.001 t1059.003 t1068 t1070 t1071 t1071.001 t1071.004 t1078 t1078.004 t1082 t1083 t1087 t1090 t1090.001 t1090.003 t1105 t1106 t1112 t1123 t1127 t1132 t1132.001 t1133 t1134 t1134.001 t1134.002 t1134.004 t1136 t1136.001 t1136.002 t1137 t1137.002 t1140 t1190 t1195 t1195.002 t1202 t1203 t1204 t1204.001 t1204.004 t1213 t1213.003 t1216 t1218 t1218.001 t1218.008 t1218.010 t1218.011 t1218.013 t1219 t1219.002 t1486 t1489 t1490 t1496 t1498 t1499 t1499.001 t1505 t1505.003 t1526 t1528 t1543 t1543.003 t1546 t1546.008 t1546.015 t1548 t1548.002 t1550 t1550.003 t1552 t1552.004 t1553 t1553.004 t1555 t1556 t1556.006 t1557 t1557.001 t1558 t1558.003 t1564 t1564.004 t1566 t1566.001 t1566.002 t1569 t1569.002 t1570 t1574 t1574.001 t1574.007 t1586 t1587 t1587.001 t1588 t1588.002 t1590 t1590.001 t1590.002 t1620 t1649 t1653 t1685 t1685.001 t1689 windows bitbucket opencanary okta linux azure aws m365 sigma
users authenticating from multiple devices and using the devicecode protocol or the visual studio code client.	t1078 t1528 t1550 t1566 azure elastic
users enrolling or joining devices while on corporate vpns, consumer vpns, or cloud egress that map to the listed asns may match. legitimate mobile device management or bulk provisioning that uses the broker against device registration service from the same networks can also trigger alerts. baseline `source.as.organization.name` and successful broker-to-drs sign-ins before tuning exclusions for approved asns or user groups.	t1098 t1550 t1566 azure elastic
users on vpns, carrier nat, or cloud egress that map to flagged asns may match. legitimate bulk enrollment or scripted onboarding that uses the same oauth client can also produce the sequence. baseline `source.as.organization.name` and successful registration sources before adding exclusions.	t1098 t1566 google_workspace elastic
very common in environments that rely heavily on macro documents	t1566 t1566.001 windows sigma
web activity that occurs rarely in small quantities can trigger this alert. possible examples are browsing technical support or vendor urls that are used very sparsely. a user who visits a new and unique web destination may trigger this alert when the activity is sparse. web applications that generate urls unique to a transaction may trigger this when they are used sparsely. web domains can be excluded in cases such as these.	t1041 t1071 t1102 t1105 t1189 t1566 ml elastic