Analysis
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max time kernel
149s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
21-03-2024 12:45
Static task
static1
1 signatures
Behavioral task
behavioral1
Sample
dba838199351cc0c1ccbf351b32b1fb2.dll
Resource
win7-20240221-en
6 signatures
150 seconds
Behavioral task
behavioral2
Sample
dba838199351cc0c1ccbf351b32b1fb2.dll
Resource
win10v2004-20240226-en
6 signatures
150 seconds
General
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Target
dba838199351cc0c1ccbf351b32b1fb2.dll
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Size
354KB
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MD5
dba838199351cc0c1ccbf351b32b1fb2
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SHA1
677382c9f127839d9a03a21940b9655c4ed16021
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SHA256
2b58c2f317105b85a2a87419f8654e6977aa6369e16c38ee26ce4d177dcb86c7
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SHA512
38c888c75252c3199d95783c6adc3134b93b4809215823e50e42fbb0274bcd8705f1fe9435e9d9858cb17d6f2e2159aa0e278048b36693ed0a6c6796a276c26b
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SSDEEP
6144:4Daa04b6Hx6ZhQuEaJW6wKHKFUOvyrBco8nN9zsy4:6aa04bwghQDUHsB4
Score
8/10
Malware Config
Signatures
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Modifies Shared Task Scheduler registry keys 2 TTPs 2 IoCs
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D} rundll32.exe -
Installs/modifies Browser Helper Object 2 TTPs 2 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\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17} rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\ rundll32.exe -
Drops file in System32 directory 4 IoCs
description ioc Process File created C:\Windows\SysWOW64\DLTBJRZH.dll rundll32.exe File opened for modification C:\Windows\SysWOW64\DLTBJRZH.dll rundll32.exe File created C:\Windows\SysWOW64\JRZHPXFN.dll rundll32.exe File opened for modification C:\Windows\SysWOW64\JRZHPXFN.dll rundll32.exe -
description ioc Process Key created \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\Software\Microsoft\Internet Explorer\New Windows\Allow rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\SOFTWARE\Microsoft\Internet Explorer\New Windows\Allow\www.google.cn rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-399997616-3400990511-967324271-1000\SOFTWARE\Microsoft\Internet Explorer\New Windows\Allow\www.baidu.com rundll32.exe -
Modifies registry class 10 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\InprocServer32\ThreadingModel = "Apartment" rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D}\ rundll32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17} rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\ rundll32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\InprocServer32 rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D}\InprocServer32\ = "C:\\Windows\\SysWow64\\JRZHPXFN.dll" rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D}\InprocServer32\ThreadingModel = "Apartment" rundll32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{D39F5B17-E4A1-9F6C-B17D-4A07D39F5B17}\InprocServer32\ = "C:\\Windows\\SysWow64\\DLTBJRZH.dll" rundll32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D} rundll32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{39F5B17D-4A06-F5B1-17D3-A06C29F5B17D}\InprocServer32 rundll32.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 1068 wrote to memory of 3320 1068 rundll32.exe 87 PID 1068 wrote to memory of 3320 1068 rundll32.exe 87 PID 1068 wrote to memory of 3320 1068 rundll32.exe 87
Processes
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C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\dba838199351cc0c1ccbf351b32b1fb2.dll,#11⤵
- Suspicious use of WriteProcessMemory
PID:1068 -
C:\Windows\SysWOW64\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\dba838199351cc0c1ccbf351b32b1fb2.dll,#12⤵
- Modifies Shared Task Scheduler registry keys
- Installs/modifies Browser Helper Object
- Drops file in System32 directory
- Modifies Internet Explorer settings
- Modifies registry class
PID:3320
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