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Fake MicroSoft calls

 
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Old 01-17-2018
Fake MicroSoft calls
Dear colleagues,

it's that time of the year again: in recent days and weeks I'm receiving annoying numbers of annoying "support" calls from dubious "MicroSoft Centers" telling me that my computer generates errors and / or downloads malicious SW. Although ignoring these pesterers on the phone, I'm a bit concerned as I can't assess the danger they pose, coming in via VoIP.
Very few ports are open on my PC interface: SunRPC and 766 (both listened on by rpcbind), CUPS, DNS and Link-Local Multicast Name Resolution (both listened on by systemd-resolve). On my router, none of the common ports is open to the WAN.
No indication (yet) of remote interaction (attempts) in my system log file.

Does anyone of you have an idea or indication, what the threat would be and how I could prevent any damage? Can they, from VoIP connection / communication data, infer / deduct / extract information allowing them to harm?

Rgds
Rüdiger
Last edited by RudiC; 01-17-2018 at 09:40 AM..
 
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LEARN ABOUT DEBIAN

gems-client

GEMS-CLIENT(1)							gems documentation						    GEMS-CLIENT(1)

NAME

       gems-client - Show data transmitted by gems-server (1)

SYNOPSIS

       gems-client [-i] host [port]

       gems-client -h | -v

DESCRIPTION

       Connects to a computer running gems-server(1) to show in the local terminal the data transmitted, in real time.

OPTIONS

       host   Hostname or IP address where the server is running.

       port   TCP port used by the server. Default: 6666.

       -i     Ignore  server  terminal size. If this option is not supplied, gems-client disconnects itself whenever the local terminal is smaller
	      than the terminal associated to the server.

       -h     Show a short help message.

       -v     Show version information.

FUNCTION KEYS

       While gems-client is running, some keys have special functions:

       q      Quit.

       a      Enable/disable alarm blocking. When active, if the server transmits an alarm character ('a'), the client ignores it, so	the  alarm
	      does not play. This is specially useful when many clients are present in the same room, to avoid the annoying simultaneous beeps.

AUTHORS

       Diego Essaya <dessaya@fi.uba.ar>

       Emiliano Castagnari <ecastag@fi.uba.ar>

SEE ALSO

       gems-server(1), script(1)

gems								    AUGUST 2004 						    GEMS-CLIENT(1)