smbexec.py Service Installation

Severity: high
Author: Omer Faruk Celik
Source: upstream

Detects the use of smbexec.py tool by detecting a specific service installation

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1569.002` System Services: Service Execution
Lateral Movement	`T1021.002` Remote Services: SMB/Windows Admin Shares

Event coverage

Provider	Event ID	Title
Service-Control-Manager	7045

Stages and Predicates

Stage 1: `selection_eid`

Provider_Name: 'Service Control Manager'

Stage 2: `1 of selection_service_name`

ServiceName: BTOBTO

Stage 3: `1 of selection_service_image`

or:
ImagePath|contains: '.bat & del '
ImagePath|contains: '__output 2^>^&1 >'

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
`ImagePath`	match	`.bat & del` `__output 2^>^&1 >`
`Provider_Name`	eq	`Service Control Manager` corpus 43 (sigma 43)
`ServiceName`	eq	`BTOBTO`

Neighbors

Stricter alternatives (narrower than this rule)

The rules below may be useful if you find the current rule is too noisy / lacks specificity.

Invoke-Obfuscation Via Use Rundll32 - System [sigma] (adds 5 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation VAR++ LAUNCHER OBFUSCATION - System [sigma] (adds 5 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation VAR+ Launcher - System [sigma] (adds 4 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation COMPRESS OBFUSCATION - System [sigma] (adds 4 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation RUNDLL LAUNCHER - System [sigma] (adds 4 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation CLIP+ Launcher - System [sigma] (adds 3 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation STDIN+ Launcher - System [sigma] (adds 3 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation Via Stdin - System [sigma] (adds 3 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation Via Use MSHTA - System [sigma] (adds 2 filters) (first-stage match only; downstream stages may differ)
ProcessHacker Privilege Elevation [sigma] (adds 2 filters) (first-stage match only; downstream stages may differ)
Invoke-Obfuscation Via Use Clip - System [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)
Credential Dumping Tools Service Execution - System [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)
Moriya Rootkit - System [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)
PowerShell Scripts Installed as Services [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)
Service Installed By Unusual Client - System [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)
Suspicious Service Installation [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)
Tap Driver Installation [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)
RTCore Suspicious Service Installation [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)
Service Installation in Suspicious Folder [sigma] (adds 1 filter) (first-stage match only; downstream stages may differ)

Broader alternatives (more inclusive than this rule)

These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.

Invoke-Obfuscation Obfuscated IEX Invocation - System [sigma] (drops 1 filter this rule applies) (first-stage match only; downstream stages may differ)