Malware Victim Selection Through WiFi Identification
Last week, I found a malware sample that does nothing fancy, it's a data stealer but it has an interesting feature. It's always interesting to have a look at the network flows generated by malware samples. For a while, attackers use GeoIP API services to test if the victim's computer deserves to be infected... or not! By checking the public IP address used by the victim, an attacker might prevent "friends" to be infected (ex: IP addresses from the attacker's country) or if the IP address belongs to a security vendor. On the other side, the attacker might decide to infect the computer because it is located in a specific country or belongs to the targeted organization. There is plenty of free APIs that offer this feature. The ISC API provides also the same kind of details (but only the country)
remnux@remnux:~$ curl -s https://isc.sans.edu/api/ip/195.74.193.12?json | jq '.ip.ascountry' "BE"
The sample that I found (SHA256:D196E2BBCAF21D3335D72F8E2F2691474BA625E6B01C4DB41A1F91FC41A5EBDF) has a VT score of 41/69[1]. It uses the .Net framework tool regsvcs.exe[2] to execute malicious code extracted by the first stage file. The malware performs the following queries. First, it queries for the victim's public IP address with the help of icanhazip.com:
remnux@remnux:~$ curl -s http://icanhazip.com/ 81.246.x.x
The second service used is api.mylnikov.org:
remnux@remnux:~$ curl -s 'https://api.mylnikov.org/geolocation/wifi?v=1.1&bssid=00:0c:29:xx:xx:xx' {"result":404, "data":{}, "message":6, "desc":"Object was not found", "time":1608552093}
This free service provides geolocation data for WiFi MAC addresses or BSSID. This is also useful to detect the location of the victim. The malware submits the MAC address of the default gateway (in my VM environment) or the BSSID (the MAC address of the wireless access point). In my case, it did not work of course but here is an example of valid BSSID:
remnux@remnux:~$ curl -s 'https://api.mylnikov.org/geolocation/wifi?v=1.1&bssid=00:0C:42:1F:65:E9' {"result":200, "data":{"lat": 45.22038682066, "range": 141.727, "lon": 16.54741327415, "time": 1608560868}}
You can see that only latitude and longitude are returned in the JSON data but it's easy to get back the country/city using another public service:
remnux@remnux:~$ curl -s 'https://geocode.xyz/45.22,16.54?geoit=json'| jq '.state' "BA"
"api.mylnikov.org" seems to be an interesting observable!
[1] https://www.virustotal.com/gui/file/d196e2bbcaf21d3335d72f8e2f2691474ba625e6b01c4db41a1f91fc41a5ebdf/detection
[2] https://docs.microsoft.com/en-us/dotnet/framework/tools/regsvcs-exe-net-services-installation-tool
[3] https://www.mylnikov.org
Xavier Mertens (@xme)
Senior ISC Handler - Freelance Cyber Security Consultant
PGP Key
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
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> nearest public toilet to me</a>
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> public bathroom near me</a>
Anonymous
Dec 26th 2022
8 months ago
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> nearest public toilet to me</a>
<a hreaf="https://defineprogramming.com/the-public-bathroom-near-me-find-nearest-public-toilet/"> public bathroom near me</a>
Anonymous
Dec 26th 2022
8 months ago
Anonymous
Dec 26th 2022
8 months ago
https://defineprogramming.com/
Dec 26th 2022
8 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
8 months ago
rthrth
Jan 2nd 2023
8 months ago