t1557 | LoFP

t1557

Title	Tags
a user legitimately enrolling several devices in a short window (for example, a new laptop and phone during onboarding, or re-registering a device after a wipe) can produce three or more registrations. validate against the user's device inventory and onboarding activity, and consider raising the threshold or tightening the window if benign multi-device enrollment is common in the environment.	t1078 t1098 t1557 azure elastic
a user simultaneously enrolling multiple workspace-aware apps on a new device (e.g., first-time setup of gmail, drive, calendar, and meet on a new laptop in a short window) may produce three or more distinct device ids in a minute. validate by checking whether the burst is tied to a fresh device or onboarding event.	t1078 t1098 t1557 google_workspace elastic
automatic isatap configuration in some windows deployments	t1557 t1565 t1565.002 windows sigma
bulk provisioning workflows, autopilot/mdm rollouts, or device-management tooling that registers devices on behalf of users may generate multiple registrations across many users at once. suppress during planned rollout windows.	t1078 t1098 t1557 azure elastic
carrier-grade nat or load-balanced corporate egress that occasionally routes through alternate asns.	t1078 t1528 t1557 google_workspace elastic
certain applications may install root certificates for the purpose of inspecting ssl traffic.	t1553 t1557 windows macos elastic
custom or portable notepad++ installations in non-standard directories.	t1195 t1195.002 t1557 windows sigma
google's risk engine occasionally flags legitimate sign-ins as suspicious when the user is on a new device, on a vpn egress that geo-resolves to a different region, or after extended time away. validate by checking the user's recent sign-in history and confirming with the user.	t1078 t1528 t1557 rules_building_block elastic
ipv6 transition projects and network infrastructure changes	t1557 t1565 t1565.002 windows sigma
legacy internal applications, industrial control systems, or embedded devices may still require deprecated tls versions or weak ciphers. exclude known legacy destination ips or subnets after validation.	t1557 t1573 network elastic
legitimate administrative use	t1046 t1082 t1135 t1505 t1505.005 t1546 t1546.007 t1546.008 t1547 t1547.001 t1547.002 t1547.010 t1547.014 t1556 t1556.002 t1557 t1564 t1564.002 t1574 t1574.007 t1685 t1685.001 windows sigma
legitimate files with these rare hacktool names	t1557 t1557.001 windows sigma
legitimate first-time use of a new network: isp change, new vpn provider, travel to a region using a different mobile carrier, new home office.	t1078 t1528 t1557 google_workspace elastic
legitimate isatap router configuration in enterprise environments	t1557 t1565 t1565.002 windows sigma
legitimate update processes creating temporary files in unexpected locations.	t1195 t1195.002 t1557 windows sigma
legitimate use of the impacket tools	t1557 t1557.001 windows sigma
legitimate webproxy settings modification	t1539 t1557 macos elastic
legitimate windivert driver usage	t1557 t1557.001 t1599 t1599.001 windows sigma
major os upgrades or workspace client refreshes that re-attest several apps concurrently may also produce a burst. cross-reference against the user's known device os transitions.	t1078 t1098 t1557 google_workspace elastic
network administrators configuring dual-stack networking	t1557 t1565 t1565.002 windows sigma
other legitimate query to official domains not listed in the filter, needing tuning.	t1195 t1195.002 t1557 windows sigma
private hosted zones may be legitimately associated with vpcs by network or infrastructure administrators. verify whether the user identity, user agent, and source ip address align with expected administrative behavior. known and authorized associations may be exempted to reduce noise.	t1098 t1557 T1583 aws elastic
some legitimate network misconfigurations or proxy issues causing unexpected dns queries.	t1195 t1195.002 t1557 windows sigma
uncommon but legitimate windows administrator or software tasks that make use of the encrypting file system rpc calls. verify if this is common activity (see description).	t1187 t1557 t1557.001 zeek 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 onelogin okta zeek cisco kubernetes rpc_firewall linux windows gcp m365 azure aws macos 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 okta bitbucket opencanary linux windows m365 azure aws sigma
unlikely. except due to misconfigurations	t1078 t1110 t1557 huawei juniper cisco sigma
users on vpn or proxy egress that geo-resolves through a region distant from the user's physical location. mobile clients on cellular carrier networks that peer through regional hubs may geo-resolve to a different region than the user's physical location. corporate aws workspaces / vdi deployments where employees interactively sign in from a cloud-provider asn.	t1078 t1528 t1557 azure elastic