Analysis
- max time kernel
229s - max time network
294s - platform
windows10-2004_x64 - resource
win10v2004-20220901-en - resource tags
- submitted
16/12/2022, 12:38
General
- Target BraveBrowserSetup.exe
- Size 309.1MB
- Sample221216-pvfecsef97
- SHA256 bd06228669802c5ee2f00c900dd17efd1763780b17f05346d5ddcf6ead24297b
Malware Config
Signatures
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 2 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses 2FA software files, possible credential harvesting 2 TTPs
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 18 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\BraveBrowserSetup.exe"C:\Users\Admin\AppData\Local\Temp\BraveBrowserSetup.exe"1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ENC cwB0AGEAcgB0AC0AcwBsAGUAZQBwACAALQBzAGUAYwBvAG4AZABzACAAMgAwAA==2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Local\Temp\BraveBrowserSetup.exeC:\Users\Admin\AppData\Local\Temp\BraveBrowserSetup.exe2⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\Temp\BraveBrowserSetup.exe" & exit3⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout /t 64⤵
- Delays execution with timeout.exe
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
mozglue.dll
nss3.dll
memory/456-142-0x0000000007D90000-0x000000000840A000-memory.dmp
memory/456-143-0x0000000006C00000-0x0000000006C1A000-memory.dmp
memory/456-137-0x0000000003130000-0x0000000003166000-memory.dmp
memory/456-138-0x0000000005900000-0x0000000005F28000-memory.dmp
memory/456-139-0x0000000005FA0000-0x0000000006006000-memory.dmp
memory/456-140-0x0000000006100000-0x0000000006166000-memory.dmp
memory/456-141-0x0000000006720000-0x000000000673E000-memory.dmp
memory/2044-134-0x0000000005980000-0x0000000005A12000-memory.dmp
memory/2044-132-0x0000000000E20000-0x0000000000EE6000-memory.dmp
memory/2044-135-0x0000000005A20000-0x0000000005A42000-memory.dmp
memory/2044-133-0x0000000005E90000-0x0000000006434000-memory.dmp
memory/4272-145-0x0000000000400000-0x000000000046B000-memory.dmp
memory/4272-146-0x0000000000400000-0x000000000046B000-memory.dmp
memory/4272-147-0x0000000000400000-0x000000000046B000-memory.dmp
memory/4272-148-0x0000000000400000-0x000000000046B000-memory.dmp
memory/4272-149-0x0000000060900000-0x0000000060992000-memory.dmp
memory/4272-171-0x0000000000400000-0x000000000046B000-memory.dmp