Detection rules › Splunk
Windows Bluetooth Service Installed From Uncommon Location
Identifies the creation of a Windows service named "BluetoothService" with a binary path in user-writable directories, particularly %AppData%\Bluetooth. This technique was observed in the Lotus Blossom Chrysalis backdoor campaign, where attackers created a service named "BluetoothService" pointing to a malicious binary (renamed Bitdefender Submission Wizard) in a hidden AppData directory. While legitimate Bluetooth services exist in Windows, they are system services with binaries in System32. Any BluetoothService created with a binary path in user directories (AppData, Temp, Downloads) is highly suspicious and indicates potential malware persistence.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1543.003 Create or Modify System Process: Windows Service |
| Privilege Escalation | T1543.003 Create or Modify System Process: Windows Service |
| Defense Evasion | T1036 Masquerading |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Service-Control-Manager | 7045 |
Stages and Predicates
Stage 1: search
search EventCode=7045 ImagePath IN ("*\\AppData\\*", "*\\ProgramData\\*", "*\\Temp\\*", "*\\Users\\*\\Bluetooth\\*") ServiceName IN ("Bluetooth Service", "BluetoothService")
Stage 2: stats
stats BY Computer, ServiceName, ImagePath, ServiceType, StartType, UserID
Stage 3: rename
rename
Stage 4: search
search
Stage 5: search
search
Stage 6: search
search `macro`
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 |
|---|---|---|
EventCode | eq |
|
ImagePath | in |
|
ServiceName | in |
|
Neighbors
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 (drops 3 filters this rule applies)
- Malicious Powershell Executed As A Service (drops 2 filters this rule applies)
- Randomly Generated Windows Service Name (drops 2 filters this rule applies)
- Windows Service Created with Suspicious Service Name (drops 2 filters this rule applies)