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Analysis
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max time kernel
120s -
max time network
125s -
platform
windows7_x64 -
resource
win7-20231215-en -
resource tags
arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system -
submitted
30/12/2023, 20:53
Behavioral task
behavioral1
Sample
1c3f983cae9383ce43176eb050ba588c.dll
Resource
win7-20231215-en
4 signatures
150 seconds
General
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Target
1c3f983cae9383ce43176eb050ba588c.dll
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Size
194KB
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MD5
1c3f983cae9383ce43176eb050ba588c
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SHA1
4beea54759f7bac618496921e85644aaf3c30fd5
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SHA256
5c22ccbac370338b99748960a57fb58a0325911f2ccd52649b46693c614fe5d7
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SHA512
2c4111e0c733acc72aaa277640ade762c1225ef933aca0f67a1768e4190f91cbaad64c578dc13f1811dd18f5afd30b563d9342a12f18d23b76cef0116e2ce6e2
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SSDEEP
3072:bbhMAVF6/YjD7BOqV0u37mYsl9SPnjdTKYYOIhB+8Oj2VS+fDAPdfe1l1AVE:6AVNDV9V7q7eR0f/k+bam/1
Malware Config
Signatures
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resource yara_rule behavioral1/memory/2000-0-0x00000000004B0000-0x0000000000534000-memory.dmp upx -
Installs/modifies Browser Helper Object 2 TTPs 1 IoCs
BHOs are DLL modules which act as plugins for Internet Explorer.
description ioc Process Key created \REGISTRY\MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{EA2FCCA9-F44F-43DD-9724-9339950D103C} regsvr32.exe -
Modifies registry class 11 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Classes\1c3f983cae9383ce43176eb050ba588c.Thunder5Helper regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\1c3f983cae9383ce43176eb050ba588c.Thunder5Helper\ = "Thunder5ÏÂÔظ¨Öú" regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{EA2FCCA9-F44F-43DD-9724-9339950D103C}\ProgID regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{EA2FCCA9-F44F-43DD-9724-9339950D103C} regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{EA2FCCA9-F44F-43DD-9724-9339950D103C}\InprocServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\1c3f983cae9383ce43176eb050ba588c.dll" regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{EA2FCCA9-F44F-43DD-9724-9339950D103C}\InprocServer32\ThreadingModel = "Apartment" regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\1c3f983cae9383ce43176eb050ba588c.Thunder5Helper\Clsid\ = "{EA2FCCA9-F44F-43DD-9724-9339950D103C}" regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{EA2FCCA9-F44F-43DD-9724-9339950D103C}\ProgID\ = "1c3f983cae9383ce43176eb050ba588c.Thunder5Helper" regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{EA2FCCA9-F44F-43DD-9724-9339950D103C}\ = "Thunder5ÏÂÔظ¨Öú" regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{EA2FCCA9-F44F-43DD-9724-9339950D103C}\InprocServer32 regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\1c3f983cae9383ce43176eb050ba588c.Thunder5Helper\Clsid regsvr32.exe -
Suspicious use of WriteProcessMemory 7 IoCs
description pid Process procid_target PID 2300 wrote to memory of 2000 2300 regsvr32.exe 28 PID 2300 wrote to memory of 2000 2300 regsvr32.exe 28 PID 2300 wrote to memory of 2000 2300 regsvr32.exe 28 PID 2300 wrote to memory of 2000 2300 regsvr32.exe 28 PID 2300 wrote to memory of 2000 2300 regsvr32.exe 28 PID 2300 wrote to memory of 2000 2300 regsvr32.exe 28 PID 2300 wrote to memory of 2000 2300 regsvr32.exe 28
Processes
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C:\Windows\system32\regsvr32.exeregsvr32 /s C:\Users\Admin\AppData\Local\Temp\1c3f983cae9383ce43176eb050ba588c.dll1⤵
- Suspicious use of WriteProcessMemory
PID:2300 -
C:\Windows\SysWOW64\regsvr32.exe/s C:\Users\Admin\AppData\Local\Temp\1c3f983cae9383ce43176eb050ba588c.dll2⤵
- Installs/modifies Browser Helper Object
- Modifies registry class
PID:2000
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