Introduction
This diary provides indicators from a Lumma Stealer infection that was followed by Sectop RAT (ArechClient2). I searched for cracked versions of popular copyright-protected software, and I downloaded the initial malware after following the results of one such search. This is a common distribution technique for various families of malware, and I often find Lumma Stealer this way.
In this case, the initial malware for Lumma Stealer was delivered as a password-protected 7-zip archive. The extracted malware is an inflated Windows executable (EXE) file at 806 MB. The EXE is padded with null-bytes (0x00), a technical which increases the EXE size while allowing the compressed archive file to be much smaller. The password-protected archive and inflated EXE file are designed to avoid detection.
Images from the infection
Shown above: Example of a page with instructions to download the initial malware file.
Shown above: Traffic from the infection filtered in Wireshark.
Shown above: Sectop RAT persistent on an infected Windows host.
Indicators of Compromise
Example of download link from the site advertising cracked versions of copyright-protected software:
hxxps[:]//incolorand[.]com/how-visual-patch-enhances-ui-consistency-across-releases/?utm_source={CID}&utm_term=Adobe%20Premiere%20Pro%20(2026)%20Full%20v26.0.2%20Espa%C3%B1ol%20[Mega]&utm_content={SUBID1}&utm_medium={SUBID2}
Example of URL for page with the file download instructions:
hxxps[:]//mega-nz.goldeneagletransport[.]com/Adobe_Premiere_Pro_%282026%29_Full_v26.0.2_Espa%C3%B1ol_%5BMega%5D.zip?c=ABUZ4WkRgQUA_YUCAFVTFwASAAAAAACh&s=360721
Example of URL for file download from site above site impersonating MEGA:
hxxps[:]//arch.primedatahost3[.]cfd/auth/media/JvWcFd5vUoYTrImvtWQAASTh/Adobe_Premiere_Pro_(2026)_Full_v26.0.2_Espa%C3%B1ol_%5BMega%5D.zip
Downloaded file:
Extracted malware:
Deflated malware:
Lumma Stealer command and control (C2) domains from Triage sandbox analysis:
Follow-up malware:
Example of Sectop RAT C2 traffic from an infected Windows host:
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Bradley Duncan
brad [at] malware-traffic-analysis.net
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