"aa" distribution Qakbot (Qbot) infection with DarkVNC traffic

"aa" distribution Qakbot (Qbot) infection with DarkVNC traffic
Chain of Events Email --> link --> downloaded zip archive --> extracted Excel file --> enable macros --> HTTPS traffic for Qakbot DLL files --> Qakbot C2 activity --> DarkVNC traffic Images Shown above: Link from an email distributing Qakbot ("aa" distribution tag) in a web browser. Shown above: Downloaded zip archive and extracted spreadsheet. Shown above: Qakbot DLL files saved to an infected Windows host. Shown above: Traffic from the infection filtered in Wireshark. Shown above: TCP streams for DarkVNC traffic on 45.153.241[.]142 over TCP port 443. Shown above: Qakbot traffic on 23.111.114[.]52 over TCP port 65400. Indicators of Compromise (IOCs) Malware from an infected Windows host: SHA256 hash: 685aa1d29540f5b63effec08fdf63f8bc7e995d1f15635cc1fd251bb7fb0dc73 File size: 1,093,506 bytes File name: cocithoueqrta.zip File location: hxxps://conta2000[.]cl/po/cocithoueqrta File location: hxxps://conta2000[.]cl/po/A3105126785.zip File description: zip archive downloaded from link in email SHA256 hash: 236b9d345a9b405c4850f880e1734712967d7cc34b176c270e78dd6f02f9839d File size: 1,215,731 bytes File name: J-233015633.xlsb File description: Excel file with macro for Qakbot SHA256 hash: 74400f2acc98e59ddeba6d55da3ee0ea0c909eefdefeca4f1d3bf817a27b692b File size: 1,385,866 bytes File location: hxxps://debtsolversuk[.]co[.]uk/HLpeQJZi/NbVfNbhn.png File location: C:\Rfgsg\Jefseg.ooccxx File description: Initial Qakbot DLL Run method: regsvr32.exe [filename] SHA256 hash: 29942eb47c0de0415b2507dff8822e3309dd4fcc2ac8d01434b37eb4f75efbe1 File size: 1,385,893 bytes File location: hxxps://pablopereirasilvaluis[.]com[.]br/OHTvXEr9c/NbVfNbhn.png File location: C:\Rfgsg\Jefsega.ooccxx Run method: regsvr32.exe [filename] SHA256 hash: 59fb3927427c68dee4c2f267f3ed4eea82dc07058061e06b3cd9b18d1a84b77f File size: 1,385,920 bytes File location: hxxps://portalregionpuno[.]com/088aFy0Xc8ap/NbVfNbhn.png File location: C:\Rfgsg\Jefsegb.ooccxx Run method: regsvr32.exe [filename] Traffic for zip archive: hxxps://conta2000[.]cl/po/cocithoueqrta hxxps://conta2000[.]cl/po/A3105126785.zip Traffic for Qakbot DLL files: hxxps://debtsolversuk[.]co[.]uk/HLpeQJZi/NbVfNbhn.png hxxps://pablopereirasilvaluis[.]com[.]br/OHTvXEr9c/NbVfNbhn.png hxxps://portalregionpuno[.]com/088aFy0Xc8ap/NbVfNbhn.png Qakbot post-infection traffic: 189.146.73[.]62 port 443 - HTTPS traffic 75.99.168[.]194 port 443 - HTTPS traffic 37.252.0[.]102 port 443 - HTTPS traffic port 443 - www.openssl[.]org - HTTPS traffic (connectivity check, not inherently malicious) 23.111.114[.]52 port 65400 - TCP traffic Dark VNC traffic: 45.153.241[.]142 port 443 - TCP traffic with encoded data. Certificate issuer data for Qakbot HTTPS traffic: Certificate issuer data for HTTPS traffic to 189.146.73[.]62: id-at-countryName=AU id-at-stateOrProvinceName=DA id-at-localityName=Ieiaegim id-at-organizationName=Vuropti Mika Aguaugaf Inc. id-at-commonName=qchzpkuwhuh.org Certificate issuer data for HTTPS traffic to 75.99.168[.]194: id-at-countryName=AU id-at-stateOrProvinceName=WD id-at-localityName=Ntp id-at-organizationName=Venyec Giteg Xgsw Inc. id-at-commonName=onuwbkiz.us Certificate issuer data for HTTPS traffic to 37.252.0[.]102: id-at-countryName=US id-at-stateOrProvinceName=CA id-at-localityName=Los Angeles id-at-organizationName=vipsauna[.]com id-at-commonName=vipsauna[.]com Final words A packet capture (pcap) of the infection traffic and the associated malware samples are available here. The pcap is from an Active Directory (AD) environment. The pcap been sanitized to disguise usernames, hostnames, domains, internal IP addresses, the public IP address used to connect from my test lab to the Internet, and any other information that could identify the environment. --- Brad Duncan brad [at] malware-traffic-analysis.net	Brad 435 Posts ISC Handler Apr 20th 2022
Thread locked Subscribe	Apr 20th 2022 2 months ago
Hi Brad, I received a suspicious email from the same attacker and would love to forward the information to you (context, email, URL hyperlink with .zip, etc.) to investigate. Is there any way we can DM?	Anonymous
Quote	Apr 20th 2022 2 months ago