Detect Exfiltration Over Other Network Medium in CrowdStrike LogScale
Adversaries may attempt to exfiltrate data over a different network medium than the command and control channel. If the command and control network is a wired Internet connection, the exfiltration may occur over a WiFi connection, modem, cellular data connection, Bluetooth, or another radio frequency (RF) channel. Adversaries may choose to do this if they have sufficient access or proximity, and the connection might not be secured or defended as well as the primary Internet-connected channel because it is not routed through the same enterprise network monitoring infrastructure. This technique is commonly associated with insider threat scenarios and advanced adversaries who have achieved a foothold and seek to bypass perimeter DLP controls that monitor only the primary wired egress channel.
MITRE ATT&CK
- Tactic
- Exfiltration
- Canonical reference
- https://attack.mitre.org/techniques/T1011/
LogScale Detection Query
#event_simpleName = "ProcessRollup2"
| IsNetshWlan := if(
FileName = /netsh\.exe/i
AND CommandLine = /wlan|hostednetwork|mode=allow|mode=disallow|mobile.hotspot/i,
1, 0)
| IsBluetoothTool := if(
FileName = /fsquirt\.exe|bttray\.exe/i,
1, 0)
| IsPSWireless := if(
FileName = /powershell\.exe|pwsh\.exe/i
AND CommandLine = /bluetooth|wlan|wifi|netadapter|get-netadapter|new-wifiprofile|hostednetwork|softap|mobilebroadband|set-netconnectionprofile/i
AND (
ParentBaseFileName = /cmd\.exe|powershell\.exe|wscript\.exe|cscript\.exe|mshta\.exe|rundll32\.exe|regsvr32\.exe|schtasks\.exe/i
OR CommandLine = /-enc|-EncodedCommand|Compress-Archive|DownloadFile|exfil/i
),
1, 0)
| SuspicionScore := IsNetshWlan + IsBluetoothTool + IsPSWireless
| SuspicionScore > 0
| DetectionBranch := case {
IsNetshWlan = 1 : "NetshWlanConfig";
IsBluetoothTool = 1 : "BluetoothFileTransfer";
IsPSWireless = 1 : "PSWirelessManipulation";
* : "Other"
}
| IsHotspotCreation := if(
CommandLine = /hostednetwork|mode=allow|softap/i,
"true", "false")
| IsWirelessDiscovery := if(
CommandLine = /show.interface|show.networks|show.profiles|show.hostednetwork|get-netadapter/i,
"true", "false")
| table(
[timestamp, ComputerName, UserName, FileName, CommandLine,
ParentBaseFileName, DetectionBranch, IsHotspotCreation,
IsWirelessDiscovery, SuspicionScore],
sortby=timestamp, order=desc)CrowdStrike LogScale (Falcon Data Replicator) query detecting T1011 exfiltration over alternate network mediums via ProcessRollup2 events. Computes per-event boolean signals (IsNetshWlan, IsBluetoothTool, IsPSWireless) and aggregates them into a SuspicionScore. Classifies each hit into a DetectionBranch and surfaces IsHotspotCreation and IsWirelessDiscovery flags for analyst triage. Uses LogScale regex match syntax on FileName, CommandLine, and ParentBaseFileName fields available in Falcon Insight EDR telemetry.
Data Sources
Required Tables
False Positives & Tuning
- Network operations staff running documented netsh wlan diagnostics, troubleshooting wireless interface state, or scripting hosted-network setup for guest Wi-Fi provisioning in office environments
- IT helpdesk or end users launching fsquirt.exe or bttray.exe during approved Bluetooth file transfer workflows for device onboarding, peripheral firmware updates, or cross-device document sharing
- Endpoint management platforms, patch orchestration tools, or security agents spawning PowerShell to enumerate or reconfigure network adapters during change-window automation or asset discovery scans
Other platforms for T1011
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Create and Start WiFi Hosted Network via netsh
Expected signal: Sysmon Event ID 1: Two Process Create events — first with CommandLine containing 'wlan set hostednetwork mode=allow ssid=df00tech-test-exfil', second containing 'wlan start hostednetwork'. Security Event ID 4688 if command-line auditing is enabled. Windows WLAN-AutoConfig Operational Event ID 11000 (Microsoft-Windows-WLAN-AutoConfig: The wireless Hosted Network started successfully). Registry change under HKLM\SYSTEM\CurrentControlSet\Services\WlanSvc\Parameters\HostedNetworkSettings.
- Test 2Launch Bluetooth File Transfer Wizard (fsquirt.exe)
Expected signal: Sysmon Event ID 1: Process Create with Image=C:\Windows\System32\fsquirt.exe, ParentImage=powershell.exe, User=current user. Security Event ID 4688 if command-line auditing is enabled. Bluetooth-Driver Operational log may record adapter activation. No file creation or network connection events since no transfer is completed.
- Test 3Wireless Adapter Reconnaissance via PowerShell and netsh
Expected signal: Sysmon Event ID 1: Process Create for powershell.exe with CommandLine containing 'Get-NetAdapter' and 'PhysicalMediaType'. Child Sysmon Event ID 1 processes for netsh.exe with CommandLine 'wlan show interfaces' and 'wlan show profiles'. PowerShell ScriptBlock Log Event ID 4104 with the full script content.
- Test 4Linux Bluetooth Device Discovery and OBEX Transfer Preparation
Expected signal: Linux auditd (if configured with execve rules): SYSCALL records type=EXECVE for hciconfig, hcitool, bluetoothctl, and rfkill with their arguments and auid/uid/pid context. Syslog/journal entries from the Bluetooth daemon (bluetoothd) showing adapter state transitions. If Microsoft Defender for Linux is deployed, DeviceProcessEvents will record these process creation events.
References (8)
- https://attack.mitre.org/techniques/T1011/
- https://attack.mitre.org/techniques/T1011/001/
- https://learn.microsoft.com/en-us/windows-server/networking/technologies/netsh/netsh-contexts
- https://learn.microsoft.com/en-us/windows/win32/wlanapi/about-the-wireless-hosted-network
- https://learn.microsoft.com/en-us/windows-hardware/drivers/bluetooth/bluetooth-faq--transferring-files-faq
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1011/T1011.md
- https://github.com/SigmaHQ/sigma/tree/master/rules/windows/network_connection
- https://learn.microsoft.com/en-us/windows/win32/bluetooth/bluetooth-and-bluetooth-le
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