Astaroth (Guildma) infection

Published: 2022-02-16
Last Updated: 2022-02-16 05:19:44 UTC
by Brad Duncan (Version: 1)
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Introduction

Today's diary is a quick post of an Astaroth (Guildma) malware infection I generated early on Wednesday 2022-02-16 from a malicious email targeting a Brazil-based recipient on Tuesday 2022-02-15.

Images from the infection


Shown above: Screenshot from the email that kicked off the infection.


Shown above:  Downloading a zip archive after clicking link in the email.


Shown above:  Content of the downloaded zip archive is a text-based .cmd file.


Shown above:  Two shortcuts in the Windows Start Menu Startup folder keep this infection persistent.


Shown above: Files used for the Astaroth (Guildma) infection.


Shown above: Traffic from the infection filtered in Wireshark.

Final Words

A packet capture (pcap) of the Astaroth infection traffic with the associated email and malware/artifacts are here.

---

Brad Duncan
brad [at] malware-traffic-analysis.net

 

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ISC Stormcast For Wednesday, February 16th, 2022 https://isc.sans.edu/podcastdetail.html?id=7882

Comments

What's this all about ..?
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Enter comment here... a fake TeamViewer page, and that page led to a different type of malware. This week's infection involved a downloaded JavaScript (.js) file that led to Microsoft Installer packages (.msi files) containing other script that used free or open source programs.
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.
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