Using SettingSyncHost.exe as LOLBin

Severity: high
Author: Anton Kutepov, oscd.community
Source: upstream

Detects using SettingSyncHost.exe to run hijacked binary

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1574.008` Hijack Execution Flow: Path Interception by Search Order Hijacking
Privilege Escalation	`T1574.008` Hijack Execution Flow: Path Interception by Search Order Hijacking
Defense Evasion	`T1574.008` Hijack Execution Flow: Path Interception by Search Order Hijacking

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `not system_utility`

or:
Image|startswith: 'C:\Windows\SysWOW64\'
Image|startswith: 'C:\Windows\System32\'

Stage 2: `parent_is_settingsynchost`

ParentCommandLine|contains: -outputpath
ParentCommandLine|contains: RoamDiag.cmd
ParentCommandLine|contains: 'cmd.exe /c'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`Image`	starts_with	`C:\Windows\SysWOW64\` corpus 16 (sigma 16) `C:\Windows\System32\` corpus 16 (sigma 16)
`ParentCommandLine`	match	`-outputpath` `RoamDiag.cmd` `cmd.exe /c`