Analysis
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max time kernel
143s -
max time network
112s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system -
submitted
26/12/2023, 03:20
Static task
static1
2 signatures
Behavioral task
behavioral1
Sample
4fcd95e4645eac7c9f5687dbbcec2512.exe
Resource
win7-20231129-en
0 signatures
150 seconds
General
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Target
4fcd95e4645eac7c9f5687dbbcec2512.exe
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Size
653KB
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MD5
4fcd95e4645eac7c9f5687dbbcec2512
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SHA1
b64099e7dc392874ba08d31c8f8aeb1e3302603d
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SHA256
f1a1664e0504f5a1575022dbdcfd19c6a5abdda6fb4a841e116b34b263e56495
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SHA512
ddb68ff8e0ac386db6a389018f0cd69e72ad8c822b4dd61978a16c6cdd18af8d6f922957bbe8d3ac62b09ecfc13fbe57f2502b3d1e6c4d6d9826dae18cabe6d0
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SSDEEP
12288:dhkDgouVA2nxKkorvdRgQriDwOIxmxiZnYQE7PJcbNmEh:rRmJkcoQricOIQxiZY1WNmM
Malware Config
Signatures
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description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 4fcd95e4645eac7c9f5687dbbcec2512.exe -
Loads dropped DLL 4 IoCs
pid Process 1184 RegAsm.exe 1184 RegAsm.exe 1184 RegAsm.exe 1184 RegAsm.exe -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 4fcd95e4645eac7c9f5687dbbcec2512.exe -
Installs/modifies Browser Helper Object 2 TTPs 2 IoCs
BHOs are DLL modules which act as plugins for Internet Explorer.
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{8a194578-81ea-4850-9911-13ba2d71efbd}\Alright = "1" RegAsm.exe Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{8a194578-81ea-4850-9911-13ba2d71efbd} RegAsm.exe -
AutoIT Executable 1 IoCs
AutoIT scripts compiled to PE executables.
resource yara_rule behavioral2/memory/5076-0-0x0000000000400000-0x00000000004B5000-memory.dmp autoit_exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Modifies Internet Explorer Phishing Filter 1 TTPs 3 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\Software\Microsoft\Internet Explorer\PhishingFilter 4fcd95e4645eac7c9f5687dbbcec2512.exe Set value (int) \REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\SOFTWARE\Microsoft\Internet Explorer\PhishingFilter\EnabledV8 = "0" 4fcd95e4645eac7c9f5687dbbcec2512.exe Set value (int) \REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\SOFTWARE\Microsoft\Internet Explorer\PhishingFilter\EnabledV9 = "0" 4fcd95e4645eac7c9f5687dbbcec2512.exe -
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\Software\Microsoft\Internet Explorer\Main 4fcd95e4645eac7c9f5687dbbcec2512.exe Set value (str) \REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\SOFTWARE\Microsoft\Internet Explorer\Main\Isolation = "PMIL" 4fcd95e4645eac7c9f5687dbbcec2512.exe Key created \REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\Software\Microsoft\Internet Explorer\Download 4fcd95e4645eac7c9f5687dbbcec2512.exe Set value (str) \REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\SOFTWARE\Microsoft\Internet Explorer\Download\CheckExeSignatures = "no" 4fcd95e4645eac7c9f5687dbbcec2512.exe -
Modifies registry class 23 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Youtube.HD RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\CodeBase = "file:///C:/Users/Admin/AppData/Roaming/YoutubeHD/YoutubeHD.DLL" RegAsm.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\ProgId RegAsm.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\Implemented Categories\{62C8FE65-4EBB-45e7-B440-6E39B2CDBF29} RegAsm.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD} RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\ThreadingModel = "Both" RegAsm.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\1.0.0.0 RegAsm.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\Implemented Categories RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Component Categories\{62C8FE65-4EBB-45E7-B440-6E39B2CDBF29}\0 = ".NET Category" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\ProgId\ = "Youtube.HD" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Youtube.HD\CLSID\ = "{8A194578-81EA-4850-9911-13BA2D71EFBD}" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\ = "Youtube.HD" RegAsm.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32 RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\Assembly = "YoutubeHD, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\1.0.0.0\Class = "Youtube.HD" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\1.0.0.0\Assembly = "YoutubeHD, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\1.0.0.0\CodeBase = "file:///C:/Users/Admin/AppData/Roaming/YoutubeHD/YoutubeHD.DLL" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Youtube.HD\ = "Youtube.HD" RegAsm.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Youtube.HD\CLSID RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\ = "mscoree.dll" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\Class = "Youtube.HD" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\RuntimeVersion = "v4.0.30319" RegAsm.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{8A194578-81EA-4850-9911-13BA2D71EFBD}\InprocServer32\1.0.0.0\RuntimeVersion = "v4.0.30319" RegAsm.exe -
Suspicious behavior: EnumeratesProcesses 2 IoCs
pid Process 5076 4fcd95e4645eac7c9f5687dbbcec2512.exe 5076 4fcd95e4645eac7c9f5687dbbcec2512.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 5076 wrote to memory of 1184 5076 4fcd95e4645eac7c9f5687dbbcec2512.exe 46 PID 5076 wrote to memory of 1184 5076 4fcd95e4645eac7c9f5687dbbcec2512.exe 46 PID 5076 wrote to memory of 1184 5076 4fcd95e4645eac7c9f5687dbbcec2512.exe 46 -
System policy modification 1 TTPs 2 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System 4fcd95e4645eac7c9f5687dbbcec2512.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 4fcd95e4645eac7c9f5687dbbcec2512.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\4fcd95e4645eac7c9f5687dbbcec2512.exe"C:\Users\Admin\AppData\Local\Temp\4fcd95e4645eac7c9f5687dbbcec2512.exe"1⤵
- UAC bypass
- Checks whether UAC is enabled
- Modifies Internet Explorer Phishing Filter
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
- System policy modification
PID:5076 -
C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exeC:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe /codebase "C:\Users\Admin\AppData\Roaming\YoutubeHD\YoutubeHD.dll"2⤵
- Loads dropped DLL
- Installs/modifies Browser Helper Object
- Modifies registry class
PID:1184
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