Russian organizations have been focused as a part of an ongoing marketing campaign that delivers a beforehand undocumented Home windows adware known as Batavia.
The exercise, per cybersecurity vendor Kaspersky, has been lively since July 2024.
“The focused assault begins with bait emails containing malicious hyperlinks, despatched underneath the pretext of signing a contract,” the Russian firm mentioned. “The primary objective of the assault is to contaminate organizations with the beforehand unknown Batavia adware, which then proceeds to steal inner paperwork.”
The e-mail messages are despatched from the area “oblast-ru[.]com,” which is alleged to be owned by the attackers themselves. The hyperlinks embedded throughout the digital missives result in the obtain of an archive file containing a Visible Fundamental Encoded script (.VBE) file.
When executed, the script profiles the compromised host and exfiltrates the system info to the distant server. That is adopted by the retrieval of a next-stage payload from the identical server, an executable written in Delphi.
The malware seemingly shows a faux contract to the sufferer as a distraction whereas amassing system logs, workplace paperwork (*.doc, *.docx, *.ods, *.odt, *.pdf, *.xls, and *.xlsx), and screenshots within the background. The info gathering additionally extends to detachable gadgets connected to the host.
One other functionality of the Delphi malware is to obtain a binary of its personal from the server, which targets a broader set of file extensions for subsequent assortment. This consists of photos, emails, Microsoft PowerPoint shows, archive recordsdata, and textual content paperwork (*.jpeg, *.jpg, *.cdr, *.csv, *.eml, *.ppt, *.pptx, *.odp, *.rar, *.zip, *.rtf, and *.txt).
The newly collected information is then transmitted to a special area (“ru-exchange[.]com”), from the place an unknown executable is downloaded as a fourth-stage for persevering with the assault chain additional.
Telemetry information from Kaspersky exhibits that greater than 100 customers throughout a number of dozen organizations acquired phishing emails over the previous 12 months.
“Because of the assault, Batavia exfiltrates the sufferer’s paperwork, in addition to info corresponding to a listing of put in packages, drivers, and working system parts,” the corporate mentioned.
The disclosure comes as Fortinet FortiGuard Labs detailed a malicious marketing campaign that delivers a Home windows stealer malware codenamed NordDragonScan. Whereas the precise preliminary entry vector isn’t clear, it is believed to be a phishing e mail that propagates a hyperlink to set off the obtain of an RAR archive.
“As soon as put in, NordDragonScan examines the host and copies paperwork, harvests total Chrome and Firefox profiles, and takes screenshots,” safety researcher Cara Lin mentioned.
Current throughout the archive is a Home windows shortcut (LNK) file that stealthily makes use of “mshta.exe” to execute a remotely hosted HTML Utility (HTA). This step ends in the retrieval of a benign decoy doc, whereas a nefarious .NET payload is quietly dropped onto the system.
NordDragonScan, because the stealer malware is known as, establishes connections with a distant server (“kpuszkiev[.]com”), units up persistence by way of Home windows Registry adjustments, and conducts in depth reconnaissance of the compromised machine to gather delicate information and exfiltrate the knowledge again to the server by way of an HTTP POST request.
“The RAR file incorporates LNK calls that invoke mshta.exe to execute a malicious HTA script, displaying a decoy doc in Ukrainian, Lin mentioned. “Lastly, it quietly installs its payload within the background. NordDragonScan is able to scanning the host, capturing a screenshot, extracting paperwork and PDFs, and sniffing Chrome and Firefox profiles.”
