On Wednesday 2021-10-20, Proofpoint reported the TA551 (Shathak) campaign started pushing malware based on Sliver. Sliver is a framework used by red teams for adversary simluation and penetration testing. I’ve already posted my findings on TA551’s Sliver activity from 2021-10-20.
That same day, Sliver-based malware was also being pushed by the “Stolen Images Evidence” campaign. Today’s diary reviews a Sliver infection from the “Stolen Images Evidence” campaign.
The “Stolen Images Evidence” campaign uses emails generated through contact forms on various websites. So these messages don’t originate through normal spam methods. They appear through contact form submissions describing a copyright violation to the intended victim. These form-submitted messages include a Google-based URL in the message text. This malicious link supposedly provides proof of stolen images that resulted in a copyright violation.
Another theme used by this same campaign is “DDoS attack Evidence” which operates in the same manner as “Stolen Images Evidence” activity.
Below are screenshots from the infection traffic filtered in Wireshark.
A 10 MB malware DLL was saved to the infected user’s AppDataLocalTemp directory. There was no apparent method of persistence, and rebooting the computer ended this particular infection. However, if an infected host runs long enough, someone might use Sliver to download other malware and establish or maintain a presence in the victim’s environment.
Indicators of Compromise (IOCs)
URL for the “Stolen Images Evidence” page:
Malicious domain called by the above Google URL:
104.21.91[.]115 port 443 – bacionera[.]top – HTTPS traffic
Traffic generated by Stolen Images Evidence.js file:
104.21.65[.]22 port 80 – sobolpand[.]top – GET /333g100/index.php
104.21.65[.]22 port 80 – sobolpand[.]top – GET /333g100/main.php
Post-infection traffic for Sliver-based malware:
23.81.246[.]193 port 443 – nopogew[.]com – HTTPS traffic
File size: 5,575 bytes
File name: Stolen Images Evidence.zip
File description: zip archive downloaded from “Stolen Images Evidence” page
File size: 18,362 bytes
File name: Stolen Images Evidence.js
File description: JS file extracted from Stolen Images Evidence.zip
File size: 10,572,806 bytes
File location: hxxp://sobolpand[.]top /333g100/main.php
File location: C:Users[username]AppDataLocalTempriuQtga.dat
File description: Windows DLL for SLIVER-based malware
Run method: regsvr32.exe [filename]
Using the any.run sandbox, we were able to decrypt some of the HTTPS traffic generated by the Sliver-based malware. URLs in the HTTPS traffic from this sandbox analysis follow:
nopogew[.]com – GET /sample.txt?_=24307128
nopogew[.]com – GET /info.txt?_=43639523
nopogew[.]com – POST /admin/login.jsp?_=34297139
nopogew[.]com – GET /underscore.min.js?_=14130295
nopogew[.]com – POST /rest/login.php?_=29759540
nopogew[.]com – GET /static/underscore.min.js?_=34644478
nopogew[.]com – GET /js/underscore.min.js?_=429465
nopogew[.]com – GET /underscore.min.js?_=42953899
nopogew[.]com – GET /jquery.min.js?_=98185060
nopogew[.]com – GET /static/underscore.min.js?_=92424842
nopogew[.]com – GET /dist/underscore.min.js?_=99992372
nopogew[.]com – GET /js/underscore.min.js?_=83694471
nopogew[.]com – GET /bootstrap.min.js?_=23925416
nopogew[.]com – GET /jquery.min.js?_=69790205
nopogew[.]com – GET /underscore.min.js?_=66973448
nopogew[.]com – GET /static/bootstrap.min.js?_=16343884
nopogew[.]com – GET /dist/bootstrap.min.js?_=66112726
A packet capture (pcap) of the infection traffic and associated malware samples can be found here.
brad [at] malware-traffic-analysis.net
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
Source: Read More (SANS Internet Storm Center, InfoCON: green)