Analysis
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max time kernel
166s -
max time network
183s -
platform
windows10-2004_x64 -
resource
win10v2004-20220721-en -
resource tags
arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system -
submitted
31-07-2022 22:23
Static task
static1
Behavioral task
behavioral1
Sample
csrss.exe
Resource
win7-20220715-en
Behavioral task
behavioral2
Sample
csrss.exe
Resource
win10v2004-20220721-en
General
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Target
csrss.exe
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Size
55KB
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MD5
97de24939a69d700be5efbfa388b32ca
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SHA1
10fb3bb9a8060069770272dacb96a3756a536807
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SHA256
6455f22ea582d86f85a968a6623cbb53bd81f1ad0dd22c98f62a07e2b4b73e5d
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SHA512
c04d65684c655af6c33c113291a503437c36bd25fc8ac1694671459065c32c07696c0644ec9cd0cda5abc488e1495365b1f577b42c11a0059b18e0f81d71e74a
Malware Config
Extracted
C:\how_to_back_files.html
Signatures
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GlobeImposter
GlobeImposter is a ransomware first seen in 2017.
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Modifies extensions of user files 12 IoCs
Ransomware generally changes the extension on encrypted files.
Processes:
csrss.exedescription ioc Process File opened for modification C:\Users\Admin\Pictures\ReceivePing.tiff csrss.exe File renamed C:\Users\Admin\Pictures\ReceivePing.tiff => C:\Users\Admin\Pictures\ReceivePing.tiff.DREAM csrss.exe File renamed C:\Users\Admin\Pictures\UnprotectComplete.crw => C:\Users\Admin\Pictures\UnprotectComplete.crw.DREAM csrss.exe File renamed C:\Users\Admin\Pictures\BlockMove.crw => C:\Users\Admin\Pictures\BlockMove.crw.DREAM csrss.exe File renamed C:\Users\Admin\Pictures\CompleteAssert.png => C:\Users\Admin\Pictures\CompleteAssert.png.DREAM csrss.exe File renamed C:\Users\Admin\Pictures\DebugSwitch.crw => C:\Users\Admin\Pictures\DebugSwitch.crw.DREAM csrss.exe File opened for modification C:\Users\Admin\Pictures\DismountSearch.tiff csrss.exe File renamed C:\Users\Admin\Pictures\DismountSearch.tiff => C:\Users\Admin\Pictures\DismountSearch.tiff.DREAM csrss.exe File renamed C:\Users\Admin\Pictures\UpdateUnblock.png => C:\Users\Admin\Pictures\UpdateUnblock.png.DREAM csrss.exe File renamed C:\Users\Admin\Pictures\ClearMove.crw => C:\Users\Admin\Pictures\ClearMove.crw.DREAM csrss.exe File opened for modification C:\Users\Admin\Pictures\EnableConvertFrom.tiff csrss.exe File renamed C:\Users\Admin\Pictures\EnableConvertFrom.tiff => C:\Users\Admin\Pictures\EnableConvertFrom.tiff.DREAM csrss.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application 2 TTPs 2 IoCs
Processes:
csrss.exedescription ioc Process Key created \REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce csrss.exe Set value (str) \REGISTRY\USER\S-1-5-21-1101907861-274115917-2188613224-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\BrowserUpdateCheck = "C:\\Users\\Admin\\AppData\\Local\\csrss.exe" csrss.exe -
Drops desktop.ini file(s) 24 IoCs
Processes:
csrss.exedescription ioc Process File opened for modification C:\Users\Public\Pictures\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Pictures\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Pictures\Saved Pictures\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Documents\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Contacts\desktop.ini csrss.exe File opened for modification C:\Users\Public\desktop.ini csrss.exe File opened for modification C:\Users\Public\Music\desktop.ini csrss.exe File opened for modification C:\Users\Public\Downloads\desktop.ini csrss.exe File opened for modification C:\Users\Public\AccountPictures\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Searches\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Saved Games\desktop.ini csrss.exe File opened for modification C:\Users\Public\Videos\desktop.ini csrss.exe File opened for modification C:\Users\Public\Libraries\desktop.ini csrss.exe File opened for modification C:\Users\Admin\OneDrive\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Favorites\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Desktop\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Favorites\Links\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Downloads\desktop.ini csrss.exe File opened for modification C:\Users\Public\Documents\desktop.ini csrss.exe File opened for modification C:\Users\Public\Desktop\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Videos\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Pictures\Camera Roll\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Music\desktop.ini csrss.exe File opened for modification C:\Users\Admin\Links\desktop.ini csrss.exe