Analysis
- max time kernel
150s - max time network
132s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
08/08/2026, 19:54
General
- Target avast_secure_browser_setup.exe
- Size 6.8MB
- Sample260808-ymrl4axzaz
- SHA256 798e3802db8a96ec665a3edfdb3a4f14db6db6b5a168685cc16a7230d37e7739
Score
7/10
Malware Config
Signatures
- Executes dropped EXE 1 IoCs
- Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Checks for any installed AV software in registry 1 TTPs 1 IoCs
- Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
- Browser Information Discovery 1 TTPs
Enumerate browser information.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Checks SCSI registry key(s) 3 TTPs 3 IoCs
SCSI information is often read in order to detect sandboxing environments.
- Suspicious behavior: EnumeratesProcesses 20 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\avast_secure_browser_setup.exe"C:\Users\Admin\AppData\Local\Temp\avast_secure_browser_setup.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\nsi7D07.tmp\AvastBrowserInstaller.exe"C:\Users\Admin\AppData\Local\Temp\nsi7D07.tmp\AvastBrowserInstaller.exe" "C:\Users\Admin\AppData\Local\Temp\avast_secure_browser_setup.exe"2⤵
- Executes dropped EXE
- Checks for any installed AV software in registry
- Writes to the Master Boot Record (MBR)
- System Location Discovery: System Language Discovery
- Checks SCSI registry key(s)
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
-
Network
MITRE ATT&CK Enterprise v16
Credential Access
Credentials from Password Stores
1Credentials from Web Browsers
1Unsecured Credentials
1Credentials In Files
1Replay Monitor
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Downloads
AvastBrowserInstaller.exe
AvastBrowserUpdateSetup.exe
sciterui.dll