Detection rules › Sigma
MMC Executing Files with Reversed Extensions Using RTLO Abuse
Detects malicious behavior where the MMC utility (mmc.exe) executes files with reversed extensions caused by Right-to-Left Override (RLO) abuse, disguising them as document formats.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1204.002 User Execution: Malicious File |
| Defense Evasion | T1036.002 Masquerading: Right-to-Left Override, T1218.014 System Binary Proxy Execution: MMC |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
Stages and Predicates
Stage 1: all of selection_image
or:
Image|endswith: '\mmc.exe'
OriginalFileName: MMC.exe
Stage 2: all of selection_commandline
or:
CommandLine|contains: cod.msc
CommandLine|contains: fdp.msc
CommandLine|contains: ftr.msc
CommandLine|contains: lmth.msc
CommandLine|contains: slx.msc
CommandLine|contains: tdo.msc
CommandLine|contains: xcod.msc
CommandLine|contains: xslx.msc
CommandLine|contains: xtpp.msc
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 |
|
Image | ends_with |
|
OriginalFileName | eq |
|