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Trying to send email to myself with zip attachment



 
 
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  #1  
Old March 14th 18, 06:29 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Moz[_3_]
external usenet poster
 
Posts: 1
Default Trying to send email to myself with zip attachment

gmail account
using thunderbird latest.

Will NOT use google cloud to do this !

trying to send a zip file to myself so I can get it remotely but Tbird
or provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?
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  #2  
Old March 14th 18, 06:54 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
mick
external usenet poster
 
Posts: 280
Default Trying to send email to myself with zip attachment

On 14/03/2018 17:29:52, Moz wrote:
gmail account
using thunderbird latest.

Will NOT use google cloud to do this !

trying to send a zip file to myself so I can get it remotely but Tbird or
provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?


remove .zip when sending then add it back on when you receive it, or
rename .zip to jpg then rename at the receiving end.

--
mick
  #3  
Old March 14th 18, 07:03 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Ralph Fox
external usenet poster
 
Posts: 474
Default Trying to send email to myself with zip attachment

On Wed, 14 Mar 2018 10:29:52 -0700, Moz wrote:

gmail account
using thunderbird latest.

Will NOT use google cloud to do this !

trying to send a zip file to myself so I can get it remotely but Tbird
or provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?



It's not the zip file itself that is the problem, but what is inside
the zip file.

For example, some email providers will not let you email exe files
even when they are inside zip files.

https://support.google.com/mail/answer/6590 .


You didn't say what was inside the zip file, nor who your email
provider is.


--
Kind regards
Ralph
  #4  
Old March 14th 18, 07:11 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Mike Easter
external usenet poster
 
Posts: 1,064
Default Trying to send email to myself with zip attachment

Moz wrote:
gmail account
using thunderbird latest.

Will NOT use google cloud to do this !


What (or Whynot) does that sentence mean?

trying to send a zip file to myself so I can get it remotely but Tbird
or provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?


Gmail support answer: https://support.google.com/mail/answer/6590?hl=en
File types blocked in Gmail

Gmail solution:

Put the file in google drive. Access it yourself; or if you were
sending it to another, send the other the google drive link.

Alternate solution: Create a gmail with the file attached but don't
send it. Access the unsent mail in the gmail webmail drafts 'folder'/label.

--
Mike Easter
  #5  
Old March 14th 18, 07:33 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Paul[_32_]
external usenet poster
 
Posts: 11,873
Default Trying to send email to myself with zip attachment

Moz wrote:
gmail account
using thunderbird latest.

Will NOT use google cloud to do this !

trying to send a zip file to myself so I can get it remotely but Tbird
or provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?


What are your cryptography skills like ?

Files can be recognized a couple of ways:

1) File extension. The email system won't put a particular
lot of weight on this, but some might consider it a "hint"
that you've been naughty. Changing the .zip to .txt will
fool no one.

2) Sniffing the file type the Linux way. Go to certain
hex offsets inside the file, examine the bytes. Something
like WinZip probably has a very nice, fat, reliable signature
that screams "Yes, Petunia, I'm a ZIP!!!".

OK, so how do you stop (2) from happening. They're going
to freak out if you send a PE32 file (an EXE). No way a
SFX (self extracting archive) is going to get through.
And a regular ZIP isn't going to work either.

I do a Google search, and here's an example of what I find.

http://www.ghettoforensics.com/2014/...re-emails.html

So if you want transparent attachment transmission, you're going
to need to "up your game" a notch. This uses RSA2048, but before
the encryption step, it applies compression. So you don't need to
compress the file first. It "compresses and encrypts", because that
order makes much much smaller files than "encrypt and compress".
Encryption is intended to add entropy (i.e. make stuff look random),
which defeats compression.

https://www.gpg4win.org/

Paul
  #6  
Old March 14th 18, 08:46 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Char Jackson
external usenet poster
 
Posts: 10,449
Default Trying to send email to myself with zip attachment

On Wed, 14 Mar 2018 10:29:52 -0700, Moz wrote:

trying to send a zip file to myself so I can get it remotely but Tbird
or provider or ???? keeps reporting that is is a security risk.

I renamed it several ways but it still did not go.

What is the trick ?


My corporate IT Helpdesk publishes the following advice: If you need to
send an attachment that would otherwise get stripped or blocked by the
scanning engine, put it inside a password-protected zip file.

That always works for me and is probably worth a try.

--

Char Jackson
  #7  
Old March 14th 18, 09:11 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
J. P. Gilliver (John)[_4_]
external usenet poster
 
Posts: 2,679
Default Trying to send email to myself with zip attachment

In message , Char Jackson
writes:
On Wed, 14 Mar 2018 10:29:52 -0700, Moz wrote:

trying to send a zip file to myself so I can get it remotely but Tbird
or provider or ???? keeps reporting that is is a security risk.

I renamed it several ways but it still did not go.

What is the trick ?


My corporate IT Helpdesk publishes the following advice: If you need to
send an attachment that would otherwise get stripped or blocked by the
scanning engine, put it inside a password-protected zip file.

That always works for me and is probably worth a try.

Yes, I used to do that at work. A single-letter password sufficed.

Obviously the email system has to allow password-protected .zip files.
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

"We're plumbing shallows we didn't know existed here" - Jeremy Paxman (as
quizmaster of "University Challenge"), 1998 (when losing team suddenly put on a
spurt by showing knowledge of things like the Eurovision Song Contest ...)
  #8  
Old March 14th 18, 10:23 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Shadow
external usenet poster
 
Posts: 1,638
Default Trying to send email to myself with zip attachment

On Wed, 14 Mar 2018 14:46:32 -0500, Char Jackson
wrote:

On Wed, 14 Mar 2018 10:29:52 -0700, Moz wrote:

trying to send a zip file to myself so I can get it remotely but Tbird
or provider or ???? keeps reporting that is is a security risk.

I renamed it several ways but it still did not go.

What is the trick ?


My corporate IT Helpdesk publishes the following advice: If you need to
send an attachment that would otherwise get stripped or blocked by the
scanning engine, put it inside a password-protected zip file.

That always works for me and is probably worth a try.


Zip shows the contents, even if it's password protected. So
rename the .exe or .zip to .txt and then zip-password protect it.

7-zip hides the filename, so Google will block 7-zipped files.

Ah, and just tried it. Winrar gives you the option to hide the
filename when you password protect it, so Google will probably block
that too.
[]'s
--
Don't be evil - Google 2004
We have a new policy - Google 2012
  #9  
Old March 15th 18, 01:47 AM posted to alt.windows7.general,microsoft.public.windowsxp.general
Stan Brown
external usenet poster
 
Posts: 2,904
Default Trying to send email to myself with zip attachment

On Wed, 14 Mar 2018 14:46:32 -0500, Char Jackson wrote:
On Wed, 14 Mar 2018 10:29:52 -0700, Moz wrote:

[quoted text muted]

I renamed it several ways but it still did not go.

What is the trick ?


My corporate IT Helpdesk publishes the following advice: If you need to
send an attachment that would otherwise get stripped or blocked by the
scanning engine, put it inside a password-protected zip file.

That always works for me and is probably worth a try.


Yes, that works for me also. And it's not just EXEs. I have to send
XLSM files that way to customers.

Bloody Outlook won't let us send XLSM files to co-workers. Note that
the entire transaction is within our company LAN, no Internet
involved, but still Outlook refuses to deliver the mail. Our IT guy
says that can't be changed. So instead we use internal network shares
and send each other links.

--
Stan Brown, Oak Road Systems, Tompkins County, New York, USA
http://BrownMath.com/
http://OakRoadSystems.com/
Shikata ga nai...
  #10  
Old March 15th 18, 01:49 AM posted to alt.windows7.general,microsoft.public.windowsxp.general
Stan Brown
external usenet poster
 
Posts: 2,904
Default Trying to send email to myself with zip attachment

On Wed, 14 Mar 2018 20:11:16 +0000, J. P. Gilliver (John) wrote:
In message , Char Jackson
writes:
My corporate IT Helpdesk publishes the following advice: If you need to
send an attachment that would otherwise get stripped or blocked by the
scanning engine, put it inside a password-protected zip file.

That always works for me and is probably worth a try.

Yes, I used to do that at work. A single-letter password sufficed.


I favor "password". It's the one time I can legitimately use it.

--
Stan Brown, Oak Road Systems, Tompkins County, New York, USA
http://BrownMath.com/
http://OakRoadSystems.com/
Shikata ga nai...
  #11  
Old March 15th 18, 03:06 AM posted to alt.windows7.general,microsoft.public.windowsxp.general
VanguardLH[_2_]
external usenet poster
 
Posts: 10,881
Default Trying to send email to myself with zip attachment

Moz wrote:

gmail account
using thunderbird latest.

Will NOT use google cloud to do this !

trying to send a zip file to myself so I can get it remotely but Tbird
or provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?


As I recall, Google has a filter that blocks sending e-mail to yourself.
That is an old spammer trick since rarely do users filter out bogus
e-mails that say the were sent from the same user. Gmail also filters
out duplicate messages, so sending from A to B to A (where A and B are
the same account) look like duplicates so you won't receive it again.

https://support.google.com/a/answer/1703601?hl=en

I have filters (server- or client-side) that junk any e-mails that
purport to have been sent from myself. Rarely do I e-mail myself.
Because there are rare occasions when I do want to e-mail myself, I use
a rule to look for a passcode string (that only I, er, my filter knows)
in the Subject header. E-mails from myself sent to myself, especially
using the same account, get junked unless I have added the passcode
string to the Subject header. However, that will not circumvent
Google's anti-spam filtering regarding e-mails from an account directed
to the same account and looking like duplicates.

Google started Gmail as a webmail service. They had their own designs
as to how that service should work, like using tags instead of folders.
Then they added POP and IMAP access; however, they don't follow the RFC
standards and have to emulate tags as folders (for IMAP). They also
reserve handling options to server-side options and ignore what the
client does, like what happens after a new e-mail gets retrieved by a
local client. As such, Google's rendition of POP and IMAP are more
appropriately labelled gPOP and gIMAP. They do it their way, not the
standard way.

You'll have better luck sending your e-mail to a different account (even
if a different Gmail account). You can then either monitor that other
e-mail account or have Gmail poll that other account to pull e-mails
from there back to your Gmail account. Don't expect Gmail to behave
like other POP and IMAP services that follow the RFC rules.
  #12  
Old March 15th 18, 03:43 AM posted to alt.windows7.general,microsoft.public.windowsxp.general
David E. Ross[_2_]
external usenet poster
 
Posts: 1,035
Default Trying to send email to myself with zip attachment

On 3/14/2018 10:54 AM, mick wrote:
On 14/03/2018 17:29:52, Moz wrote:
gmail account
using thunderbird latest.

Will NOT use google cloud to do this !

trying to send a zip file to myself so I can get it remotely but Tbird or
provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?


remove .zip when sending then add it back on when you receive it, or
rename .zip to jpg then rename at the receiving end.


That is exactly what I did when I had the same problem. Just be sure
that the covering E-mail message tells the recipient how to restore the
correct extension.

--
David E. Ross
http://www.rossde.com/

President Trump: Please stop using Twitter. We need
to hear your voice and see you talking. We need to know
when your message is really your own and not your attorney's.
  #13  
Old March 15th 18, 01:41 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
mick
external usenet poster
 
Posts: 280
Default Trying to send email to myself with zip attachment

On 15/03/2018 02:43:24, David E. Ross wrote:
On 3/14/2018 10:54 AM, mick wrote:
On 14/03/2018 17:29:52, Moz wrote:
gmail account
using thunderbird latest.

Will NOT use google cloud to do this !

trying to send a zip file to myself so I can get it remotely but Tbird or
provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?


remove .zip when sending then add it back on when you receive it, or
rename .zip to jpg then rename at the receiving end.


That is exactly what I did when I had the same problem. Just be sure
that the covering E-mail message tells the recipient how to restore the
correct extension.


That works with private email addresses but not with gmail, google
throws it out every time whatever extension is added or disguise
adopted.

The OP is using gmail which I did not notice on my first reply.
I have tried emailing to my own gmail account and so far I have not
been able to circumvent their security.

--
mick
  #14  
Old March 15th 18, 02:09 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
R.Wieser
external usenet poster
 
Posts: 1,302
Default Trying to send email to myself with zip attachment

Mick,

I have tried emailing to my own gmail account and so far I have not been
able to circumvent their security.


Checking for double messages ? Just add some random data into the (re)send
message. Most likely even a counter will do.

Checking if the send files are "dangerous" ? Change the first few bytes in
the (executable or ZIP, etc) file (take any hex editor and add one to each
letter A-B, B-C, etc. See Napoleons ring for that - and our modern ROT13
"encryption") so the file ID becomes unrecognisable (but reversable)*.

Ofcourse, by editing them that way your ISP gets exactly what it wants: The
considered-to-be-noobs on the other side (in this case: yourself) will not
be able to simply double-click and run them. :-)

*with just a little bit of luck you could do that with some VBScript or
alike - as long as it can handle binary data.

Regards,
Rudy Wieser


  #15  
Old March 15th 18, 02:41 PM posted to alt.windows7.general,microsoft.public.windowsxp.general
Paul[_32_]
external usenet poster
 
Posts: 11,873
Default Trying to send email to myself with zip attachment

mick wrote:
On 15/03/2018 02:43:24, David E. Ross wrote:
On 3/14/2018 10:54 AM, mick wrote:
On 14/03/2018 17:29:52, Moz wrote:
gmail account
using thunderbird latest.

Will NOT use google cloud to do this !

trying to send a zip file to myself so I can get it remotely but
Tbird or provider or ???? keeps reporting that is is a security risk.

Hey I a sending it to myself !

so how do I do this ?

I renamed it several ways but it still did not go.

What is the trick ?

remove .zip when sending then add it back on when you receive it, or
rename .zip to jpg then rename at the receiving end.


That is exactly what I did when I had the same problem. Just be sure
that the covering E-mail message tells the recipient how to restore the
correct extension.


That works with private email addresses but not with gmail, google
throws it out every time whatever extension is added or disguise adopted.

The OP is using gmail which I did not notice on my first reply.
I have tried emailing to my own gmail account and so far I have not been
able to circumvent their security.


Did you try crypto ? Just curious.

And I'm not talking about the password on ZIP. Some
earlier version of ZIP, you could crack the password
in no time. Might not even be considered cracking
as such.

There's GNUPG.

https://www.glump.net/howto/cryptogr...ard-in-windows

And a sanitized version with seemingly no options (back when I tried it).
This compresses your file first, before applying something like RSA2048.

https://www.gpg4win.org/download.html

Now, what I prefer myself, is something lighter weight.
A "reversible transform" is some simple function you cook up,
such that if it's applied twice, the original data comes back.
Say for example, we reverse the letters in "Paul" and make
"lauP". Now, some form of automation, not designed for this
sort of thing, will simply conclude the file is "data". Whereas
a human reading the file, will recognize the transform and
undo it, or find a tool to undo it.

Even using a transform of your own making, written in some
language, might work against the gmail attachment scanner.

*******

And there are concepts like this, where transmission to
yourself is a perfect application for it.

https://en.wikipedia.org/wiki/One-time_pad

You can make a random file with this. Here, I decide
I need a 31,415,926 byte random file. We're not really
all that worried about cryptographic perfection here,
because this is merely a demo. Humans are not involved.
The NSA isn't trying to crack this.

dd if=/dev/random of=random.bin bs=31415926 count=1

Now, all we need is a program to XOR two files.

http://www.nirsoft.net/utils/xorfiles.html

That's actually a GUI program, which access two input filenames
and one output filename. Just don't type a drive letter
into the box for the destination. Enter your destination
filename only ("send.bin") and select the drive letter
using the Browse button.

You make random.bin the same length as the number of bytes in
the message.

message.bin = 31,415,926 bytes

You make up a random.bin the same length, as in the example
above with "dd.exe".

Then, using Nirs XORFiles (making sure the two files are
the same length, for fewest surprises!!!)

message.bin XOR random.bin == send.bin

And that's the file you attach to your Gmail.

Later, the recipient of the message (with random.bin
file in hand) does

send.bin XOR random.bin == got_your_message.bin

It's a reversible transform, as long as you have the
random.bin in hand. In a perfect world, you make a different
random.bin for every message sent. And you "sneakernet"
the random.bin to the recipient at some point.

When sending to yourself, the random.bin is already
in your hand. Suitable for the purpose of proving Gmail
can't crack it.

There *are* email services that will not forward things
they can't snoop, so there's always that part of it.
I don't know if Gmail is like that or not, whether they
would stop crypto transmissions or not.

Paul
 




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