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A Friday the 13th failure for Agenttesla campaign

It looks like Friday the 13th  is unlucky for this malware bad actor, trying to deliver yet another AgentTesla keylogger / info-stealer  because as far as I can tell this malware chain is broken so the victim should not get the payload.

WE still see loads of AgentTesla keylogger/ Info-stealer malware campaigns hitting the UK most days. Today is no exception with quite a few so far. I don’t always post them here, unless there is something slightly different or unusual about either the delivery method or the malware itself changes. I just submit to Antivirus companies & most times tweet the details to other security researchers.

The email is the usual junk email that should be blocked by most spam filters.

Proof of payment.msg       Current Virus total detectionsanyrun|

Proof of payment.doc  VirusTotal | Anyrun

This drops an embedded ole object encoded / encrypted script file after you press a few yes buttons on the word doc. This sct file has some rather interesting content

Abctfhghghghghg.scT  VirusTotal 

KIM SERV.exe    VirusTotal | anyrun

This malicious word doc attempts to download the AgentTesla binary from http://fs09n2.sendspace.com/dl/f6df748efc84c5322b92332eeb0707c8/5d7b0bdf7b7d1599/flzpqk/KIM%20SERV.exe  where they have made a bit of an error. when you try to visit that url manually it redirects to  https://www.sendspace.com/file/flzpqk   where you have to press the download button to be sent back to the original url where the file is downloaded. Now Anyrun app just stopped and so should any normal attempt to run this via the word doc,  so hopefully making the entire campaign fail.

The C2 / Exfil site is mail.vermak.com.tr ( which looks like another compromised site) via smtp using This email address is being protected from spambots. You need JavaScript enabled to view it. To: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

You can now submit suspicious sites, emails and files via our Submissions system

As far as I can tell westafricangroup.co.za has not been hacked or had their email or other servers compromised. They are not sending the emails to you. They are just “innocent” victims in exactly the same way as every recipient of these emails. Unfortunately they will continue to suffer until they fix their broken / misconfigured SPF and other email authentication.

One of the  emails looks like:

From: Frederica Smith <This email address is being protected from spambots. You need JavaScript enabled to view it.>

Date: Fri 13/09/2019 06:19

Subject: Proof of payment

Attachment: Proof of payment.doc

Body content:

Good Day,Hope and trust all is well with you,receive your proof of payment and i will do the needfully ASAP.kind regards

Screenshot:

Fake Email

Fake Email

Email headers & delivery records:

IP Hostname City Region Country Organisation
94.23.154.249  ip249.ip-94-23-154.eu Wattrelos Hauts-de-France FR AS16276 OVH SAS
Received: from ip249.ip-94-23-154.eu ([94.23.154.249]:51058 helo=westafricangroup.co.za)
	by knight.knighthosting.co.uk with esmtp (Exim 4.92)
	(envelope-from <This email address is being protected from spambots. You need JavaScript enabled to view it.>)
	id 1i8eCn-0002zB-EN
	for This email address is being protected from spambots. You need JavaScript enabled to view it.; Fri, 13 Sep 2019 06:33:13 +0100
Reply-To: This email address is being protected from spambots. You need JavaScript enabled to view it.
From: "Frederica Smith" <This email address is being protected from spambots. You need JavaScript enabled to view it.>
To: This email address is being protected from spambots. You need JavaScript enabled to view it.
Subject: Proof of payment
Date: 12 Sep 2019 22:33:16 -0700
Message-ID: <This email address is being protected from spambots. You need JavaScript enabled to view it.>
MIME-Version: 1.0
Content-Type: multipart/mixed;
	boundary="----=_NextPart_000_0012_CFCB8885.81AC9436"

These malicious attachments normally have a password stealing component, with the aim of stealing your bank, PayPal or other financial details along with your email or FTP ( web space) log in credentials. Many of them are also designed to specifically steal your Facebook and other social network log in details. A very high proportion are Ransomware versions that encrypt your files and demand money ( about £350/$400) to recover the files.

  All the alleged senders, amounts, reference numbers, Bank codes, companies, names of employees, employee positions, email addresses and phone numbers mentioned in the emails are all random. Some of these companies will exist and some won’t.  Don’t try to respond by phone or email, all you will do is end up with an innocent person or company who have had their details spoofed and picked at random from a long list that the bad guys have previously found. The bad guys choose companies, Government departments and organisations  with subjects that are designed to entice you or alarm you into blindly opening the attachment or clicking the link in the email to see what is happening.  

Please read our How to protect yourselves page for simple, sensible advice on how to avoid being infected by this sort of socially engineered malware.

This is another one of the  files that unless you have “show known file extensions enabled“, can easily be mistaken for  a genuine  DOC / PDF / JPG or other common file instead of the .EXE / .JS file it really is, so making it much more likely for you to accidentally open it and be infected.

 Be very careful with email attachments. All of these emails use Social engineering tricks to persuade you to open the attachments that come with the email. Whether it is a message saying “look at this picture of me I took last night” and it appears to come from a friend or is more targeted at somebody who regularly is likely to receive PDF attachments or Word .doc attachments or any other common file that you use every day.

The basic rule is NEVER open any attachment to an email, unless you are expecting it. Now that is very easy to say but quite hard to put into practice, because we all get emails with files attached to them. Our friends and family  love to send us pictures of them doing silly things, or even cute pictures of the children or pets.

Never just blindly click on the file in your email program. Always save the file to your downloads folder, so you can check it first. Many malicious files that are attached to emails will have a faked extension. That is the 3 letters at the end of the file name. Unfortunately windows by default hides the file extensions so you need to Set your folder options to “show known file types. Then when you unzip the zip file that is supposed to contain the pictures of “Sally’s dog catching a ball” or a report in word document format that work has supposedly sent you to finish working on at the weekend, or an invoice or order confirmation from some company,  you can easily see if it is a picture or document & not a malicious program.

If you see JS or .EXE or .COM or .PIF or .SCR or .HTA .vbs, .wsf , .jse  .jar at the end of the file name DO NOT click on it or try to open it, it will infect you.

While the malicious program is inside the zip file, it cannot harm you or automatically run. When it is just sitting unzipped in your downloads folder it won’t infect you, provided you don’t click it to run it. Just delete the zip and any extracted file and everything will be OK. You can always run a scan with your antivirus to be sure. There are some zip files that can be configured by the bad guys to automatically run the malware file when you double click the zip to extract the file. If you right click any suspicious zip file received, and select extract here or extract to folder ( after saving the zip to a folder on the computer) that risk is virtually eliminated. Never attempt to open a zip directly from your email, that is a guaranteed way to get infected. The best way is to just delete the unexpected zip and not risk any infection.

:

IOC:

Main object- “{Possible Spam } Proof of payment.msg”sha256 0db330096a6b4a071cbbd32f995bf71b7522ef5b37d9fb6d852817259c88af40sha1 b82aca545c13be5e1710d68b007092da931db256md5 8bb270f4c9984f7eb3a51e54b829c340DNS requestsdomain fs09n2.sendspace.comdomain www.sendspace.comConnectionsip 69.31.136.41HTTP/HTTPS requestsurl http://fs09n2.sendspace.com/dl/f6df748efc84c5322b92332eeb0707c8/5d7b0bdf7b7d1599/flzpqk/KIM%20SERV.exe

Main object- “Proof of payment.doc”sha256 cd10e8529d06d411613b0f2f77f9b260b7b2593209a42f3eacac9bdcdd63734csha1 e1038b35aad6e79d9a1ccbb6f5557531794d7e87md5 68ff10d5d7bc1c7647fda7c6aa6d8f82DNS requestsdomain www.sendspace.comdomain fs09n2.sendspace.comConnectionsip 69.31.136.41ip 69.31.136.5HTTP/HTTPS requestsurl http://fs09n2.sendspace.com/dl/f6df748efc84c5322b92332eeb0707c8/5d7b0bdf7b7d1599/flzpqk/KIM%20SERV.exe

Main object- “KIM SERV.exe”sha256 7c4d37ed7f7c81b7afd9deba5bfe9339e3fc1bb52a05033e141b7c1e5936108dsha1 7691967ff3acaa48f70554353e2ff6e7f588d4ebmd5 120c295c7f04e1e9d9ac88cbbe416966Dropped executable filesha256 C:\Users\admin\AppData\Roaming\MyApp\MyApp.exe 7c4d37ed7f7c81b7afd9deba5bfe9339e3fc1bb52a05033e141b7c1e5936108dDNS requestsdomain checkip.amazonaws.comdomain mail.vermak.com.trConnectionsip 185.179.26.186ip 3.224.145.145HTTP/HTTPS requestsurl http://checkip.amazonaws.com/

Abctfhghghghghg.scTMD5 c4893f46f6517b944c93e19d47d4f53dSHA-1 557c13d1475a87cfea96f70baee88855d465b95cSHA-256 2cd66d9cdf79ab9b69070d23ca6e02e66cd6ed0a65774ef0c1d93f600d322679

Read more https://myonlinesecurity.co.uk/a-friday-the-13th-failure-for-agenttesla-campaign/

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