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This is a silent way to transfer control to the final payload code." "A successful unpacking leads to execution of the payload via user32.CallWindowsProcA API. The unpacked payload in the memory talks to the command and control endpoints," the researchers say. "The unpacker executes the payload by spawning a new process with a name identical to itself, i.e. scr files as executables, which initiates the unpacking of the payload. scr extension is dropped into the C: directory. Next, at the final stage of Inno Setup, a packed file with a. This script execution allows the attacker to disable system protection via Windows Registry, executes WMIC to uninstall security products installed on the target system and elevates privilege via PowerRun to exclude. In the next stage, the child installer windows11-setup_11_14064.tmp executes the malware and the loader creates a new tmp in C: directory and dumps three scripts and one tool, or application. All the files are deleted after the installer exits and the directories created will have the following name convention: IS-XXXX.tmp," the researchers say. This is an internal mechanism used by Inno for Inter-Process Communication and the files that need to be executed are dropped in the Temp users' directory. "The directory path following /SL5 is the path to the parent process.
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The child process will ultimately host the code of the final payload. When running this file, Inno Setup exhibits characteristics such as creating a child process with Windows-specific command-line arguments such as /SL5, /SPAWNWND, /DEBUGWND and /NOTIFYWND. tmp, it is an executable and the loader spawns a new process via the CreateProcess Windows API," they say. Even though the extension of this file is.
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The size of the new file is 3,078 KB and MZP (Mzp file stands for mountable zip file) is the first byte. "Once the file is created, the loader writes data into it. Upon further processing the downloaded malware, it creates a folder inside the Temporary directory named windows1-setup_11_14064.tmp. While debugging the loader, the researchers found that the metadata of the Inno Setup is loaded, which helped them understand the behavior of the loader program. The malware is written in the Delphi programming language, and the developers behind the malware have built the loader using Inno Setup 6.1.0, which is a free installer for Windows, developed in Delphi.
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iso file, falsely advertised as the latest Windows 11 upgrade," Unnikrishnan says.
"On clicking the page in the results, the user is directed to the fake domain and it will prompt users to download. SEO poisoning is an illegitimate technique used to achieve a higher search engine ranking for websites, often performed in an effort to spread malware by prompting visitors to these highly ranked websites to download malicious files (see: How 'SEO Poisoning' Is Used to Deploy Malware). iso file, displayed to the user as an exe file named windows11-setup_11_14064.exe. But the malware loader is shipped inside this. iso file named Windwos11-setup_11_14064.iso. The researchers say that the threat actors use SEO poisoning to lure users to the site, where they are directed to download a malicious. The malware’s infection life cycle (Source: CloudSEK) Initial Attack VectorĪccording to the researchers, this stealer, never before seen in the wild, is distributed using a duplicate of the legitimate Windows 11 website design that tricks users by claiming to provide Windows 11 upgrades.
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26 by installing RedLine Stealer malware (see: Fake Windows 11 Upgrade Installers Add RedLine Malware). Researchers at HP Threat Research team released a similar finding in February, saying that cybercriminals were taking advantage of the final phase of the Windows 11 upgrade announced on Jan. Unnikrishnan says that the team has not attributed this malware to any particular group so far. The CloudSEK Threat Intel coined the unique specimen as 'Inno Stealer,'" Anandeshwar Unnikrishnan, a senior threat researcher at CloudSEK tells Information Security Media Group. Based on the analysis, the malware shows the behavior of a custom-made info stealer which doesn't resemble any commodity stealers.
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"CloudSEK discovered a unique malware specimen disguised as a Win 11 update as part of our campaign tracking activity.
Researchers at the India-based cybersecurity company said they noticed a malicious actor had registered the domain "windows11-upgrade11com," which they then used to spread malware by tricking users into downloading and running a fake installer. See Also: Live Webinar | Remote Employees & the Great Resignation: How Are You Managing Insider Threats? Malicious domain spreading malware (Source: CloudSEK)Ī multistage information stealer malware is targeting Windows users and stealing their data from browsers and crypto wallets using fake domains masquerading as a Windows 11 upgrade, according to CloudSEK researchers.