CmdID

CmdID / Files

wslhost.exe

Microsoft Windows Subsystem for Linux Background Host file version info

Program on Windows 1 known copy with hashes 5 Sigma rules name it

Opens CmdID with your command. It is read in your browser and sent nowhere.

Is it the real wslhost.exe?

file version info and known copies
Installed inC:\Windows\system32\lxss\
Signed byMicrosoft Windows
ProductMicrosoft Windows Operating System, Microsoft Corporation
DescriptionMicrosoft Windows Subsystem for Linux Background Host

1 known copy

10.0.17763.1075 (WinBuild.160101.0800) · C:\Windows\system32\lxss\wslhost.exe · signed by Microsoft Windows

3fd90c1dd370dbd49ca69b311c2336d194ea22fdf14103278149f97add39db4b

From the file’s version info and the copies recorded by xCyclopedia (MIT). A copy in another folder, signed by someone else or with another hash is not necessarily malicious, but it is worth a closer look. In Ceplin, "<sha256>".whatis() says which known copy a hash is.

What detects it

Sigma process creation rules that name wslhost.exe
highWSL Kali-Linux UsageSwachchhanda Shrawan Poudel (Nextron Systems)
mediumNew Remote Desktop Connection Initiated Via Mstsc.EXEfrack113
mediumWSL Child Process AnomalyNasreddine Bencherchali (Nextron Systems)
lowMstsc.EXE Execution With Local RDP FileNasreddine Bencherchali (Nextron Systems), Christopher Peacock @securepeacock

Sigma names wslhost.exe in 5 rules in all, for every kind of event; these are the process creation rules CmdID evaluates.