WhatsApp Malware Spam uses Geolocation to Mass Customize Filename
Malicious e-mails usually fall into two groups: Mass-mailed generic e-mails, and highly customized spear phishing attempts. In between these two groups fall e-mails that obviously do more to "mass customize" the e-mail based on information retrieved from other sources. E-mails that appear to come from your Facebook friends, or malware that harvests other social networks like Linkedin to craft a more personalized message.
Today, I received one e-mail that I think was done pretty well and falls into the third category. The sender went through the trouble to craft a decent personalized message, trying to make me install some Spyware.
In this example, the e-mail advised me of a new "WhatsApp" message that may be waiting for me. The e-mail looks legit, and even the link is formed to make it look like a voicemail link with the little "/play" ending
(click on image to see larger version)
the part that I thought was the most interesting was the executable you are offered as you download the emails. The downloaded file is a ZIP file, and the file name of the included executable is adjusted to show a phone number that matches the location of the IP address from which the e-mail is downloaded from.
Downloading the message from my home in Jacksonville, I get: VoiceMail_Jacksonville_(904)458abcd.exe . On the other hand, downloading it from a server whose IP's geolocation commonly shows up in Wayne PA , the file name changes to VoiceMail_Wayne_(610)458abcd.exe. I obfuscated the last four digits of the phone number, but the last four digits appear random.
As usualy, anti-malware coverage is bad according to Virustotal [1]. Anubis doesn't show much interesting stuff here, but I wouldn't be surprised if the malware detected that it ran in an analysis environment [2]. Interestingly, it appears to pop up Notepad with a generic error message.
[1] https://www.virustotal.com/en/file/39457d452107fc019d0ece92d7a5c0c8d00ac5bf8dc3bd2411b0ad90cbcae194/analysis/1387029444/
[2] http://anubis.iseclab.org/?action=result&task_id=15eb462c46d9b95f4ed4d2750b1a52b0a
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Johannes B. Ullrich, Ph.D.
SANS Technology Institute
Twitter
Comments
Anonymous
Dec 3rd 2022
9 months ago
Anonymous
Dec 3rd 2022
9 months ago
<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure. The social networks are not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go.
<a hreaf="https://technolytical.com/">the social network</a> is not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go. The social networks only collect the minimum amount of information required for the service that they provide. Your personal information is kept private, and is never shared with other companies without your permission
Anonymous
Dec 26th 2022
8 months ago
Anonymous
Dec 26th 2022
8 months ago
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Anonymous
Dec 26th 2022
8 months ago
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Anonymous
Dec 26th 2022
8 months ago
Anonymous
Dec 26th 2022
8 months ago
https://defineprogramming.com/
Dec 26th 2022
8 months ago
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https://clickercounter.org/
https://defineprogramming.com/
Dec 26th 2022
8 months ago
rthrth
Jan 2nd 2023
8 months ago