Voice Message Notifications Deliver Ransomware
Bad guys need to constantly find new ways to lure their victims. If billing notifications were very common for a while, not all people in a company are working with such kind of documents. Which types of notification do they have in common? All of them have a phone number and with modern communication channels ("Unified Communications") like Microsoft Lync or Cisco, everybody can receive a mail with a voice mail notification. Even residential systems can deliver voice message notifications.
Here is an example displayed in Microsoft Outlook:
Today, I received a wave of emails like the following:
From: voicemail@rootshell.be To: [redacted]Subject: [Vigor2820 Series] New voice mail message from 01422520472 on 2016/08/23 15:55:25 Dear [ redacted]: There is a message for you from 01422520472, on 2016/08/23 15:55:25 . You might want to check it when you get a chance.Thanks!
The sender is spoofed with the victim domain name. The following file was attached to the message:
$ unzip Message_from_01422520472.wav.zip
Archive: Message_from_01422520472.wav.zip
testing: 197577509502.wsf OK
No errors detected in compressed data of Message_from_01422520472.wav.zip.
$ md5sum 197577509502.wsf
f2ee33a688a45b161d3191693196cb1d 197577509502.wsf
Note the '.wav.zip' extension to lure the user. As usual, the payload is heavily obfuscated and the AV detection ratio is still very low (6/55 at 11:55:00 UTC)[1]
Vigor is UK company building ADSL residential modems[2]. This tends to think that the new wave is targeting residential customers.
Here are the C2 servers (for your IDS):
89.42.39.81
213.205.40.169
51.254.55.171
194.67.210.183
185.51.247.211
185.129.148.19
91.201.202.125
[1] https://www.virustotal.com/en/file/97be73cf491cf8e4d30e0e6d9b73e95151f77b3e52813e06b2ef391fa6f26b2a/analysis/1471949327/
[2] http://www.draytek.co.uk/products/legacy/vigor-2820
Xavier Mertens (@xme)
ISC Handler - Freelance Security Consultant
PGP Key
Comments
Anonymous
Dec 3rd 2022
10 months ago
Anonymous
Dec 3rd 2022
10 months ago
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<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
9 months ago
Anonymous
Dec 26th 2022
9 months ago
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Anonymous
Dec 26th 2022
9 months ago
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Anonymous
Dec 26th 2022
9 months ago
Anonymous
Dec 26th 2022
9 months ago
https://defineprogramming.com/
Dec 26th 2022
9 months ago
distribute malware. Even if the URL listed on the ad shows a legitimate website, subsequent ad traffic can easily lead to a fake page. Different types of malware are distributed in this manner. I've seen IcedID (Bokbot), Gozi/ISFB, and various information stealers distributed through fake software websites that were provided through Google ad traffic. I submitted malicious files from this example to VirusTotal and found a low rate of detection, with some files not showing as malware at all. Additionally, domains associated with this infection frequently change. That might make it hard to detect.
https://clickercounter.org/
https://defineprogramming.com/
Dec 26th 2022
9 months ago
rthrth
Jan 2nd 2023
9 months ago