Detectionhightest
Suspect Svchost Activity
It is extremely abnormal for svchost.exe to spawn without any CLI arguments and is normally observed when a malicious process spawns the process and injects code into the process memory space.
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Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic2 selectors
detection:
selection:
CommandLine|endswith: 'svchost.exe'
Image|endswith: '\svchost.exe'
filter:
- ParentImage|endswith:
- '\rpcnet.exe'
- '\rpcnetp.exe'
- CommandLine: null # no CommandLine value available
condition: selection and not filterFalse Positives
Rpcnet.exe / rpcnetp.exe which is a lojack style software. https://www.blackhat.com/docs/us-14/materials/us-14-Kamlyuk-Kamluk-Computrace-Backdoor-Revisited.pdf
References
MITRE ATT&CK
Rule Metadata
Rule ID
16c37b52-b141-42a5-a3ea-bbe098444397
Status
test
Level
high
Type
Detection
Created
Sat Dec 28
Modified
Mon Jun 27
Author
Path
rules/windows/process_creation/proc_creation_win_svchost_execution_with_no_cli_flags.yml
Raw Tags
attack.defense-evasionattack.privilege-escalationattack.t1055