Analysis
- max time kernel
67s - max time network
141s - platform
windows10_x64 - resource
win10v20210410 - submitted
08/06/2021, 19:29
Static task
static1
Behavioral task
behavioral1
Sample
bf45aaa2a719be3100e203b65989f15f.exe
Resource
win7v20210410
Behavioral task
behavioral2
Sample
bf45aaa2a719be3100e203b65989f15f.exe
Resource
win10v20210410
General
- Target bf45aaa2a719be3100e203b65989f15f.exe
- Size 800KB
- Sample210608-2x629ge296
- SHA256 cf0a70e19ceb453b5cc477ec510e6fbd8639ee114d4f182a79e150b23dcd09c2
- MD5 bf45aaa2a719be3100e203b65989f15f
- SHA1 e4cf990864f8fa14f10f96af2413280fbd291529
- SHA512 b03772ef21036d9052342169909d66bc5bb0941af1b73e3a5f71261d8b5889ba7ab8efe1bb703758b484bf5f57740cd3b4dc455845b21a258df5d5fe58c6e8a1
- MD5 SHA1 SHA512
Malware Config
Extracted
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vidar
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39.3
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517
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https://bandakere.tumblr.com
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profile_id
517
Signatures
- Deletes Windows Defender Definitions 2 TTPs 1 IoCs
Uses mpcmdrun utility to delete all AV definitions.
pid Process 3740 mpcmdrun.exe - Djvu Ransomware
Ransomware which is a variant of the STOP family.
- Vidar Stealer 4 IoCs
resource yara_rule behavioral2/memory/3884-147-0x0000000000400000-0x000000000049B000-memory.dmp family_vidar behavioral2/memory/3884-148-0x00000000004680AD-mapping.dmp family_vidar behavioral2/memory/2588-157-0x00000000021B0000-0x0000000002248000-memory.dmp family_vidar behavioral2/memory/3884-158-0x0000000000400000-0x000000000049B000-memory.dmp family_vidar - Disables Task Manager via registry modification
- Downloads MZ/PE file
- Drops file in Drivers directory 1 IoCs
description ioc Process File opened for modification C:\Windows\System32\drivers\etc\hosts updatewin2.exe - Executes dropped EXE 5 IoCs
pid Process 900 updatewin1.exe 3844 updatewin2.exe 2348 updatewin1.exe 2588 5.exe 3884 5.exe - Loads dropped DLL 2 IoCs
pid Process 3884 5.exe 3884 5.exe - Modifies file permissions 1 TTPs 1 IoCs
pid Process 3004 icacls.exe - Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-3686645723-710336880-414668232-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\d27d547b-466c-49bc-a94f-04f72e1150d9\\bf45aaa2a719be3100e203b65989f15f.exe\" --AutoStart" bf45aaa2a719be3100e203b65989f15f.exe - Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Looks up external IP address via web service 3 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 10 api.2ip.ua 11 api.2ip.ua 20 api.2ip.ua - Suspicious use of SetThreadContext 3 IoCs
description pid Process procid_target PID 3892 set thread context of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 1056 set thread context of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 2588 set thread context of 3884 2588 5.exe 90 - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 5.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString 5.exe - Delays execution with timeout.exe 1 IoCs
pid Process 748 timeout.exe - Kills process with taskkill 1 IoCs
pid Process 3128 taskkill.exe -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349 bf45aaa2a719be3100e203b65989f15f.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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 bf45aaa2a719be3100e203b65989f15f.exe - Suspicious behavior: EnumeratesProcesses 22 IoCs
pid Process 2900 bf45aaa2a719be3100e203b65989f15f.exe 2900 bf45aaa2a719be3100e203b65989f15f.exe 1852 bf45aaa2a719be3100e203b65989f15f.exe 1852 bf45aaa2a719be3100e203b65989f15f.exe 3892 powershell.exe 3892 powershell.exe 3892 powershell.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3884 5.exe 3892 powershell.exe 1952 powershell.exe 1952 powershell.exe 1952 powershell.exe 1656 powershell.exe 1656 powershell.exe 1656 powershell.exe - Suspicious use of AdjustPrivilegeToken 4 IoCs
description pid Process Token: SeDebugPrivilege 3892 powershell.exe Token: SeDebugPrivilege 1952 powershell.exe Token: SeDebugPrivilege 1656 powershell.exe Token: SeDebugPrivilege 3128 taskkill.exe - Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 3892 wrote to memory of 2900 3892 bf45aaa2a719be3100e203b65989f15f.exe 78 PID 2900 wrote to memory of 3004 2900 bf45aaa2a719be3100e203b65989f15f.exe 79 PID 2900 wrote to memory of 3004 2900 bf45aaa2a719be3100e203b65989f15f.exe 79 PID 2900 wrote to memory of 3004 2900 bf45aaa2a719be3100e203b65989f15f.exe 79 PID 2900 wrote to memory of 1056 2900 bf45aaa2a719be3100e203b65989f15f.exe 80 PID 2900 wrote to memory of 1056 2900 bf45aaa2a719be3100e203b65989f15f.exe 80 PID 2900 wrote to memory of 1056 2900 bf45aaa2a719be3100e203b65989f15f.exe 80 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1056 wrote to memory of 1852 1056 bf45aaa2a719be3100e203b65989f15f.exe 83 PID 1852 wrote to memory of 900 1852 bf45aaa2a719be3100e203b65989f15f.exe 84 PID 1852 wrote to memory of 900 1852 bf45aaa2a719be3100e203b65989f15f.exe 84 PID 1852 wrote to memory of 900 1852 bf45aaa2a719be3100e203b65989f15f.exe 84 PID 1852 wrote to memory of 3844 1852 bf45aaa2a719be3100e203b65989f15f.exe 85 PID 1852 wrote to memory of 3844 1852 bf45aaa2a719be3100e203b65989f15f.exe 85 PID 1852 wrote to memory of 3844 1852 bf45aaa2a719be3100e203b65989f15f.exe 85 PID 900 wrote to memory of 2348 900 updatewin1.exe 86 PID 900 wrote to memory of 2348 900 updatewin1.exe 86 PID 900 wrote to memory of 2348 900 updatewin1.exe 86 PID 1852 wrote to memory of 2588 1852 bf45aaa2a719be3100e203b65989f15f.exe 87 PID 1852 wrote to memory of 2588 1852 bf45aaa2a719be3100e203b65989f15f.exe 87 PID 1852 wrote to memory of 2588 1852 bf45aaa2a719be3100e203b65989f15f.exe 87 PID 2348 wrote to memory of 3892 2348 updatewin1.exe 88 PID 2348 wrote to memory of 3892 2348 updatewin1.exe 88 PID 2348 wrote to memory of 3892 2348 updatewin1.exe 88 PID 2588 wrote to memory of 3884 2588 5.exe 90 PID 2588 wrote to memory of 3884 2588 5.exe 90 PID 2588 wrote to memory of 3884 2588 5.exe 90 PID 2588 wrote to memory of 3884 2588 5.exe 90 PID 2588 wrote to memory of 3884 2588 5.exe 90 PID 2588 wrote to memory of 3884 2588 5.exe 90 PID 2588 wrote to memory of 3884 2588 5.exe 90 PID 2588 wrote to memory of 3884 2588 5.exe 90 PID 2348 wrote to memory of 1952 2348 updatewin1.exe 91 PID 2348 wrote to memory of 1952 2348 updatewin1.exe 91 PID 2348 wrote to memory of 1952 2348 updatewin1.exe 91 PID 1952 wrote to memory of 1656 1952 powershell.exe 93 PID 1952 wrote to memory of 1656 1952 powershell.exe 93 PID 1952 wrote to memory of 1656 1952 powershell.exe 93 PID 2348 wrote to memory of 3740 2348 updatewin1.exe 95 PID 2348 wrote to memory of 3740 2348 updatewin1.exe 95 PID 2348 wrote to memory of 2056 2348 updatewin1.exe 97 PID 2348 wrote to memory of 2056 2348 updatewin1.exe 97 PID 2348 wrote to memory of 2056 2348 updatewin1.exe 97 PID 3884 wrote to memory of 2684 3884 5.exe 99 PID 3884 wrote to memory of 2684 3884 5.exe 99 PID 3884 wrote to memory of 2684 3884 5.exe 99 PID 2684 wrote to memory of 3128 2684 cmd.exe 101
Processes
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C:\Users\Admin\AppData\Local\Temp\bf45aaa2a719be3100e203b65989f15f.exe"C:\Users\Admin\AppData\Local\Temp\bf45aaa2a719be3100e203b65989f15f.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3892 -
C:\Users\Admin\AppData\Local\Temp\bf45aaa2a719be3100e203b65989f15f.exe"C:\Users\Admin\AppData\Local\Temp\bf45aaa2a719be3100e203b65989f15f.exe"2⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2900 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\d27d547b-466c-49bc-a94f-04f72e1150d9" /deny *S-1-1-0:(OI)(CI)(DE,DC)3⤵
- Modifies file permissions
PID:3004
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C:\Users\Admin\AppData\Local\Temp\bf45aaa2a719be3100e203b65989f15f.exe"C:\Users\Admin\AppData\Local\Temp\bf45aaa2a719be3100e203b65989f15f.exe" --Admin IsNotAutoStart IsNotTask3⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1056 -
C:\Users\Admin\AppData\Local\Temp\bf45aaa2a719be3100e203b65989f15f.exe"C:\Users\Admin\AppData\Local\Temp\bf45aaa2a719be3100e203b65989f15f.exe" --Admin IsNotAutoStart IsNotTask4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:1852 -
C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\updatewin1.exe"C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\updatewin1.exe"5⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:900 -
C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\updatewin1.exe"C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\updatewin1.exe" --Admin6⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:2348 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exepowershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned7⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3892
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C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exepowershell -NoProfile -ExecutionPolicy Bypass -Command "& {Start-Process PowerShell -ArgumentList '-NoProfile -ExecutionPolicy Bypass -File ""C:\Users\Admin\AppData\Local\script.ps1""' -Verb RunAs}"7⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1952 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -File "C:\Users\Admin\AppData\Local\script.ps18⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1656
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C:\Program Files\Windows Defender\mpcmdrun.exe"C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all7⤵
- Deletes Windows Defender Definitions
PID:3740
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""7⤵PID:2056
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C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\updatewin2.exe"C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\updatewin2.exe"5⤵
- Drops file in Drivers directory
- Executes dropped EXE
PID:3844
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C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\5.exe"C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\5.exe"5⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2588 -
C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\5.exe"C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\5.exe"6⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:3884 -
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /im 5.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\3af4a79c-9f54-45b6-98a1-cbeec266b8e9\5.exe" & del C:\ProgramData\*.dll & exit7⤵
- Suspicious use of WriteProcessMemory
PID:2684 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im 5.exe /f8⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:3128
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C:\Windows\SysWOW64\timeout.exetimeout /t 68⤵
- Delays execution with timeout.exe
PID:748
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