Detection rules › Sigma
Writing Of Malicious Files To The Fonts Folder
Monitors for the hiding possible malicious files in the C:\Windows\Fonts\ location. This folder doesn't require admin privillege to be written and executed from.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059 Command and Scripting Interpreter |
| Defense Evasion | T1211 Exploitation for Defense Evasion |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
| Security-Auditing | 4688 | A new process has been created. |
Stages and Predicates
Stage 1: all of selection_1
or:
CommandLine|contains: cacls
CommandLine|contains: copy
CommandLine|contains: echo
CommandLine|contains: 'file createnew'
CommandLine|contains: type
Stage 2: all of selection_2
CommandLine|contains: 'C:\Windows\Fonts\'
Stage 3: all of selection_3
or:
CommandLine|contains: .bat
CommandLine|contains: .bin
CommandLine|contains: .cmd
CommandLine|contains: .cpl
CommandLine|contains: .dll
CommandLine|contains: .exe
CommandLine|contains: .hta
CommandLine|contains: .inf
CommandLine|contains: .jar
CommandLine|contains: .js
CommandLine|contains: .msh
CommandLine|contains: .msi
CommandLine|contains: .pl
CommandLine|contains: .ps
CommandLine|contains: .reg
CommandLine|contains: .scr
CommandLine|contains: .sh
CommandLine|contains: .vb
CommandLine|contains: .vbs
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 |
|---|---|---|
CommandLine | match |
|