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Analysis
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max time kernel
120s -
max time network
115s -
platform
windows10-2004_x64 -
resource
win10v2004-20231222-en -
resource tags
arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system -
submitted
25/12/2023, 14:27
Static task
static1
1 signatures
Behavioral task
behavioral1
Sample
258e826eb3f4d85ba43291f7b25e8f39.dll
Resource
win7-20231215-en
3 signatures
150 seconds
General
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Target
258e826eb3f4d85ba43291f7b25e8f39.dll
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Size
590KB
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MD5
258e826eb3f4d85ba43291f7b25e8f39
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SHA1
75d01009eb89dfc7fc92d6398cb66de59c3e5a9c
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SHA256
73aeadadd9d51ea6e6dd7c97fded151b55f44a84298c73dd6391b13ae784a724
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SHA512
6c00e7ae60ef6845f7a2b136eaba8d9441d02014239db50ac5ff9d34ed80cca4dc6bb1a78b08471ebca7c362a366e2be9640ba61312be476d55068306131b502
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SSDEEP
12288:Ds+0UWObHRykUOyDyO1E41o7plqAXMGl9/XxOb+QsGNsgH:Dn0pO7w97DbOxXMg/XxOb+Qbsg
Malware Config
Signatures
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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\{CC01FC6C-772C-2B71-F6BF-2581AB8D1185} regsvr32.exe -
Modifies registry class 11 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CC01FC6C-772C-2B71-F6BF-2581AB8D1185}\InprocServer32\ThreadingModel = "Apartment" regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\258e826eb3f4d85ba43291f7b25e8f39.brm inc\ = "brm inc" regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\258e826eb3f4d85ba43291f7b25e8f39.brm inc\Clsid regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\258e826eb3f4d85ba43291f7b25e8f39.brm inc\Clsid\ = "{CC01FC6C-772C-2B71-F6BF-2581AB8D1185}" regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CC01FC6C-772C-2B71-F6BF-2581AB8D1185}\ProgID regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CC01FC6C-772C-2B71-F6BF-2581AB8D1185} regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CC01FC6C-772C-2B71-F6BF-2581AB8D1185}\ = "brm inc" regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CC01FC6C-772C-2B71-F6BF-2581AB8D1185}\InprocServer32 regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CC01FC6C-772C-2B71-F6BF-2581AB8D1185}\InprocServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\258e826eb3f4d85ba43291f7b25e8f39.dll" regsvr32.exe Key created \REGISTRY\MACHINE\SOFTWARE\Classes\258e826eb3f4d85ba43291f7b25e8f39.brm inc regsvr32.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{CC01FC6C-772C-2B71-F6BF-2581AB8D1185}\ProgID\ = "258e826eb3f4d85ba43291f7b25e8f39.brm inc" regsvr32.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 2952 wrote to memory of 1980 2952 regsvr32.exe 19 PID 2952 wrote to memory of 1980 2952 regsvr32.exe 19 PID 2952 wrote to memory of 1980 2952 regsvr32.exe 19
Processes
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C:\Windows\SysWOW64\regsvr32.exe/s C:\Users\Admin\AppData\Local\Temp\258e826eb3f4d85ba43291f7b25e8f39.dll1⤵
- Installs/modifies Browser Helper Object
- Modifies registry class
PID:1980
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C:\Windows\system32\regsvr32.exeregsvr32 /s C:\Users\Admin\AppData\Local\Temp\258e826eb3f4d85ba43291f7b25e8f39.dll1⤵
- Suspicious use of WriteProcessMemory
PID:2952