2

I have an outlook account (was hotmail).

I see some suspicious emails in my sent folder, to unkown both in the Thunderbird client and in the Outlook web client, which I did not send.

I already changed my password, worrying that it could have been compromised; however after inspecting the source I see that my address never appears: the sender is not actually me. Also, there is no "To:"

This makes me think that maybe the account wasn't compromised, but how comes that i see the emails in the sent folder?

UPDATE: while in one case there is no "To:", the client shows "unknow" in the To column, and my address never appears in the mail source, there is also onother case where my address appears in the "To:" (not in the "From:"). I'd say that this other case looked like regular spoofing if the email was in the Inbox folder, but it is in the Sent

I include the email source (outlook website does not seem to have an option to copy only the headers). I changed ip addresses to unsignificant chars like xx.xxx.xx.xx, replaced malicious links and mail addresses. My address nor those of any contacts of mine seem involved. I may have forgotten something, feel free to edit out and please ask for more details if needed

Received: from VE1EUR02HT166.eop-EUR02.prod.protection.outlook.com
 (ffff:ffff:fff::ff) by AM4PR0401MB1970.eurprd04.prod.outlook.com with HTTPS
 via AM3PR04CA0148.EURPRD04.PROD.OUTLOOK.COM; Tue, 5 Dec 2017 16:25:07 +0000
Received: from VE1EUR02FT031.eop-EUR02.prod.protection.outlook.com
 (xx.xxx.xx.xx) by VE1EUR02HT166.eop-EUR02.prod.protection.outlook.com
 (yy.yyy.yy.yyy) with Microsoft SMTP Server (version=TLS1_2,
 cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id zz.zz.zzz.z; Tue, 5 Dec
 2017 16:25:07 +0000
Authentication-Results: spf=none (sender IP is kk.kk.k.kkk) smtp.helo=;
 hotmail.com; dkim=pass (signature was verified)
 header.d=oo.ATTACKER.NET;hotmail.com; dmarc=permerror action=none
 header.from=oo.ATTACKER.NET;
Received-SPF: None (protection.outlook.com:  does not designate permitted
 sender hosts)
Received: from SNT004-MC5F5.hotmail.com (hh.hhh.hh.hh) by
 VE1EUR02FT031.mail.protection.outlook.com (jj.jjj.jj.jjj) with Microsoft SMTP
 Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id
 15.20.282.5 via Frontend Transport; Tue, 5 Dec 2017 16:25:06 +0000
X-IncomingTopHeaderMarker: OriginalChecksum:255C39763F036EA23876BAB41428C4FF25DFCEDF36BCA46234B50E8284D7EA26;UpperCasedChecksum:07DB12FEFEE63D3A0397067AECD2CCE92B37535297A742DC2CBAC5E1A3F32423;SizeAsReceived:1422;Count:15
Received: from oo.ATTACKER.NET ([kk.kk.k.kkk]) by SNT004-MC5F5.hotmail.com with Microsoft SMTPSVC(7.5.7601.23143);
     Tue, 5 Dec 2017 08:25:05 -0800
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=selector1; d=oo.movingright.net;
 h=From:Sender:List-Unsubscribe:Subject:Content-Type:Reply-To; i=noreply@oo.ATTACKER.NET;
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   q/3t2Wx7un+6GX+btcg=
DomainKey-Signature: a=rsa-sha1; c=nofws; q=dns; s=selector1; d=oo.movingright.net;
 b=stTfJpnCQ75QjWEEG63JZ9XcPnXW6zsghQgf2LYTgo19PBNoeJ6efXiP2QZzEbwZFaS7B2tOLY8x
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   IjFh3DjV57fuqVDoH2c=;
From: â¡â¡ Sarah â¡â¡ <qvc@ATTACKER.NET>
Sender: " yh" <noreply@ATTACKER.NET>
List-Unsubscribe: <8ZVtjLfkbt85tdeRBs@tac3.betaparkarc.com>
Subject: â¡â¤ Can't wait anymore ... See my nude pics and let's meet â¤â¡
Content-Type: multipart/alternative;
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BCC:
Reply-To: <contact@ATTACKER.NET>
Return-Path: <>
Message-ID: <SNT004-MC5F5Gr0ePGO003ebae1@SNT004-MC5F5.hotmail.com>
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  • I'm no expert on email but I believe the email server can change what is in the sent folder. – Qwertie Dec 7 '17 at 2:38
  • @Qwertie can you explain what that would imply? – Mario Trucco Dec 7 '17 at 6:55
  • @thecarpy I will try to do so. No contacts of mine seem involved. Can I safely leave the addresses of the attackers? There are also ip addresses and other info that looks like better not exposing. – Mario Trucco Dec 7 '17 at 9:09
  • You should first try replace mail and IP addresses with non significant characters (xxx or yyy), using same sequence if same address appears multiple times in the mail. – Serge Ballesta Dec 7 '17 at 12:33
  • Your account was probably compromised and an e-mail was sent. Good thing it wans't a mass spam. – Overmind Dec 8 '17 at 8:50
1

2 mandatory steps to do is run anti-spyware and anti-malware and use outlook again only if you changed your password.

There are attachments and links currently in circulation under various forms that the first thing they do is to use scripts to read your outlook account password.

After obtaining that, they can do things like:

  • Send sensitive information (info theft) towards other addresses which they hide

  • Send spam - thousand or even more messages that you will never know they were sent until it's too late - you will know about it only when you will start to receive bounce-backs and/or your e-mail IP is blacklisted

  • Send various type of SMTP attacks

  • Spread the same content until there are enough drones for a larger attack

The problem with this type of attachments is that they seem very legit and they use standard e-mail functions so well defined and limited that they will not be detected as a thread by any anti-virus-like defensive system - no AV blocks legit outlook e-mails.

If your e-mail server is not secure and does not require authentication, then stealing the password is not necessary and the attacker will be able to send any e-mails he wants from any of your server's accounts.

The source fields can be faked just like the destination ones, so in order to see what actually went there you will have to investigate this on your e-mail server by looking at the logs in that times interval.

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