A Vietnamese-speaking risk actor has been linked to an information-stealing marketing campaign concentrating on authorities and training entities in Europe and Asia with a brand new Python-based malware referred to as PXA Stealer.
The malware “targets victims’ sensitive information, including credentials for various online accounts, VPN and FTP clients, financial information, browser cookies, and data from gaming software,” Cisco Talos researchers Joey Chen, Alex Karkins, and Chetan Raghuprasad stated.
“PXA Stealer has the capability to decrypt the victim’s browser master password and uses it to steal the stored credentials of various online accounts”
The connections to Vietnam stem from the presence of Vietnamese feedback and a hard-coded Telegram account named “Lone None” within the stealer program, the latter of which incorporates an icon of Vietnam’s nationwide flag and an image of the logo for Vietnam’s Ministry of Public Safety.
Cisco Talos stated it noticed the attacker promoting Fb and Zalo account credentials, and SIM playing cards within the Telegram channel “Mua Bán Scan MINI,” which has been beforehand linked to a different risk actor referred to as CoralRaider. Lone None has additionally been discovered to be energetic on one other Vietnamese Telegram group operated by CoralRaider referred to as “Cú Black Adverts – Dropship.”
That stated, it is at the moment not clear if these two intrusion units are associated, if they’re finishing up their campaigns independently of one another.
“The tools shared by the attacker in the group are automated utilities designed to manage several user accounts. These tools include a Hotmail batch creation tool, an email mining tool, and a Hotmail cookie batch modification tool,” the researchers stated.
“The compressed packages provided by the threat actor often contain not only the executable files for these tools but also their source code, allowing users to modify them as needed.”
There may be proof to recommend that such packages are supplied on the market by way of different websites like aehack[.]com that declare to supply free hack and cheat instruments. Tutorials for utilizing these instruments are shared by way of YouTube channels, additional highlighting that there’s a concerted effort to market them.
Assault chains propagating PXA Stealer begin with a phishing e-mail containing a ZIP file attachment, which features a Rust-based loader and a hidden folder that, in flip, packs in a number of Home windows batch scripts and a decoy PDF file.
The execution of the loader triggers the batch scripts, that are answerable for opening the lure doc, a Glassdoor job utility kind, whereas additionally working PowerShell instructions to obtain and run a payload able to disabling antivirus packages working on the host, adopted by deploying the stealer itself.
A noteworthy characteristic of PXA Stealer is its emphasis on stealing Fb cookies, utilizing them to authenticate a session and interacting with Fb Adverts Supervisor and Graph API to collect extra particulars concerning the account and their related ad-related data.
The concentrating on of Fb enterprise and commercial accounts has been a recurring sample amongst Vietnamese risk actors, and PXA Stealer proves to be no totally different.
The disclosure comes as IBM X-Power detailed an ongoing marketing campaign since mid-April 2023 that delivers StrelaStealer to victims throughout Europe, particularly Italy, Spain, Germany, and Ukraine. The exercise has been attributed to a “rapidly maturing” preliminary entry dealer (IAB) it tracks as Hive0145, which is believed to be the only operator of the stealer malware.
“The phishing emails used in these campaigns are real invoice notifications, which have been stolen through previously exfiltrated email credentials,” researchers Golo Mühr, Joe Fasulo, and Charlotte Hammond stated. “StrelaStealer is designed to extract user credentials stored in Microsoft Outlook and Mozilla Thunderbird.”
The recognition of stealer malware is evidenced by the continual evolution of exiting households like RECORDSTEALER (aka RecordBreaker or Raccoon Stealer V2) and Rhadamanthys, and the regular emergence of recent ones like Amnesia Stealer and Glove Stealer, regardless of regulation enforcement efforts to disrupt them.
“Glove Stealer makes use of a devoted supporting module to bypass app-bound encryption by utilizing IElevator service,” Gen Digital researcher Jan Rubín stated. “While observed being spread via phishing emails resembling ClickFix, it itself also tries to mimic a fixing tool which users might use during troubleshooting problems they might have encountered.”
