Analysis
- max time kernel
67s - max time network
129s - platform
windows10_x64 - resource
win10v20210408 - submitted
05/05/2021, 13:54
Static task
static1
Behavioral task
behavioral1
Sample
build.exe
Resource
win7v20210408
Behavioral task
behavioral2
Sample
build.exe
Resource
win10v20210408
General
- Target build.exe
- Size 831KB
- Sample210505-vce8dr9192
- SHA256 3763170476b8a4c3cb592cbea6c4471ba2ea2463db9f7839fda502ef0a06b092
- MD5 06cc2c58b35393afd830c6d37d22f4e2
- SHA1 f4abeeb4441b7842101c5f907881179cc938f9c7
- SHA512 fc866e39af2d7ddde6e3d6ffd2935077ae20d407aea84ec2e3cfd80f4974719b042408bbc6b1a33b7ab25967119d482098c88f03e867cf9afc61e31d94d03f4c
- MD5 SHA1 SHA512
Malware Config
Signatures
- Deletes Windows Defender Definitions 2 TTPs 1 IoCs
Uses mpcmdrun utility to delete all AV definitions.
pid Process 3176 mpcmdrun.exe - Djvu Ransomware
Ransomware which is a variant of the STOP family.
- 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 4 IoCs
pid Process 3732 updatewin1.exe 2120 updatewin2.exe 3828 5.exe 424 updatewin1.exe - Loads dropped DLL 2 IoCs
pid Process 3828 5.exe 3828 5.exe - Modifies file permissions 1 TTPs 1 IoCs
pid Process 2648 icacls.exe - Reads local data of messenger clients 2 TTPs
Infostealers often target stored data of messaging applications, which can include saved credentials and account information.
- 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-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\4cb66a38-1b75-4297-bece-c43d21a8194b\\build.exe\" --AutoStart" build.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 11 api.2ip.ua 12 api.2ip.ua 20 api.2ip.ua - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Program crash 14 IoCs
pid pid_target Process procid_target 1648 3828 WerFault.exe 83 2644 3828 WerFault.exe 83 2868 3828 WerFault.exe 83 2864 3828 WerFault.exe 83 852 3828 WerFault.exe 83 3880 3828 WerFault.exe 83 2172 3828 WerFault.exe 83 492 3828 WerFault.exe 83 1788 3828 WerFault.exe 83 2316 3828 WerFault.exe 83 1880 3828 WerFault.exe 83 2000 3828 WerFault.exe 83 3264 3828 WerFault.exe 83 188 3828 WerFault.exe 83 - 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 1016 timeout.exe - Kills process with taskkill 1 IoCs
pid Process 1104 taskkill.exe -
description ioc Process Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349 build.exe Set value (data) \REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\D1EB23A46D17D68FD92564C2F1F1601764D8E349\Blob = 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 build.exe - Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 852 build.exe 852 build.exe 196 build.exe 196 build.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 1648 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2644 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2868 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe 2864 WerFault.exe - Suspicious use of AdjustPrivilegeToken 20 IoCs
description pid Process Token: SeRestorePrivilege 1648 WerFault.exe Token: SeBackupPrivilege 1648 WerFault.exe Token: SeDebugPrivilege 1648 WerFault.exe Token: SeDebugPrivilege 2644 WerFault.exe Token: SeDebugPrivilege 2868 WerFault.exe Token: SeDebugPrivilege 2864 WerFault.exe Token: SeDebugPrivilege 852 WerFault.exe Token: SeDebugPrivilege 3880 WerFault.exe Token: SeDebugPrivilege 2172 WerFault.exe Token: SeDebugPrivilege 492 WerFault.exe Token: SeDebugPrivilege 1788 WerFault.exe Token: SeDebugPrivilege 2316 WerFault.exe Token: SeDebugPrivilege 1880 WerFault.exe Token: SeDebugPrivilege 2000 WerFault.exe Token: SeDebugPrivilege 3264 WerFault.exe Token: SeDebugPrivilege 188 WerFault.exe Token: SeDebugPrivilege 1104 taskkill.exe Token: SeDebugPrivilege 2204 powershell.exe Token: SeDebugPrivilege 1368 powershell.exe Token: SeDebugPrivilege 3644 powershell.exe - Suspicious use of WriteProcessMemory 41 IoCs
description pid Process procid_target PID 852 wrote to memory of 2648 852 build.exe 75 PID 852 wrote to memory of 2648 852 build.exe 75 PID 852 wrote to memory of 2648 852 build.exe 75 PID 852 wrote to memory of 196 852 build.exe 76 PID 852 wrote to memory of 196 852 build.exe 76 PID 852 wrote to memory of 196 852 build.exe 76 PID 196 wrote to memory of 3732 196 build.exe 80 PID 196 wrote to memory of 3732 196 build.exe 80 PID 196 wrote to memory of 3732 196 build.exe 80 PID 196 wrote to memory of 2120 196 build.exe 81 PID 196 wrote to memory of 2120 196 build.exe 81 PID 196 wrote to memory of 2120 196 build.exe 81 PID 196 wrote to memory of 3828 196 build.exe 83 PID 196 wrote to memory of 3828 196 build.exe 83 PID 196 wrote to memory of 3828 196 build.exe 83 PID 3732 wrote to memory of 424 3732 updatewin1.exe 96 PID 3732 wrote to memory of 424 3732 updatewin1.exe 96 PID 3732 wrote to memory of 424 3732 updatewin1.exe 96 PID 3828 wrote to memory of 2588 3828 5.exe 100 PID 3828 wrote to memory of 2588 3828 5.exe 100 PID 3828 wrote to memory of 2588 3828 5.exe 100 PID 2588 wrote to memory of 1104 2588 cmd.exe 102 PID 2588 wrote to memory of 1104 2588 cmd.exe 102 PID 2588 wrote to memory of 1104 2588 cmd.exe 102 PID 2588 wrote to memory of 1016 2588 cmd.exe 103 PID 2588 wrote to memory of 1016 2588 cmd.exe 103 PID 2588 wrote to memory of 1016 2588 cmd.exe 103 PID 424 wrote to memory of 2204 424 updatewin1.exe 104 PID 424 wrote to memory of 2204 424 updatewin1.exe 104 PID 424 wrote to memory of 2204 424 updatewin1.exe 104 PID 424 wrote to memory of 1368 424 updatewin1.exe 106 PID 424 wrote to memory of 1368 424 updatewin1.exe 106 PID 424 wrote to memory of 1368 424 updatewin1.exe 106 PID 1368 wrote to memory of 3644 1368 powershell.exe 108 PID 1368 wrote to memory of 3644 1368 powershell.exe 108 PID 1368 wrote to memory of 3644 1368 powershell.exe 108 PID 424 wrote to memory of 3176 424 updatewin1.exe 110 PID 424 wrote to memory of 3176 424 updatewin1.exe 110 PID 424 wrote to memory of 496 424 updatewin1.exe 112 PID 424 wrote to memory of 496 424 updatewin1.exe 112 PID 424 wrote to memory of 496 424 updatewin1.exe 112
Processes
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C:\Users\Admin\AppData\Local\Temp\build.exe"C:\Users\Admin\AppData\Local\Temp\build.exe"1⤵
- Adds Run key to start application
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:852 -
C:\Windows\SysWOW64\icacls.exeicacls "C:\Users\Admin\AppData\Local\4cb66a38-1b75-4297-bece-c43d21a8194b" /deny *S-1-1-0:(OI)(CI)(DE,DC)2⤵
- Modifies file permissions
PID:2648
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C:\Users\Admin\AppData\Local\Temp\build.exe"C:\Users\Admin\AppData\Local\Temp\build.exe" --Admin IsNotAutoStart IsNotTask2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:196 -
C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin1.exe"C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin1.exe"3⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:3732 -
C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin1.exe"C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin1.exe" --Admin4⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
PID:424 -
C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exepowershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned5⤵
- Suspicious use of AdjustPrivilegeToken
PID:2204
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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}"5⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1368 -
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.ps16⤵
- Suspicious use of AdjustPrivilegeToken
PID:3644
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C:\Program Files\Windows Defender\mpcmdrun.exe"C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all5⤵
- Deletes Windows Defender Definitions
PID:3176
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""5⤵PID:496
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C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin2.exe"C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin2.exe"3⤵
- Drops file in Drivers directory
- Executes dropped EXE
PID:2120
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C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\5.exe"C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\5.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
PID:3828 -
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 8404⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1648
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 9164⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2644
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 10764⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2868
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 10524⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2864
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 10884⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:852
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 11524⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:3880
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 14484⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:2172
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 14124⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:492
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 14684⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:1788
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 17124⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:2316
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 17364⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:1880
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 17804⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:2000
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 18244⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:3264
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 14404⤵
- Program crash
- Suspicious use of AdjustPrivilegeToken
PID:188
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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\fae3c7bc-8579-483b-b490-49b16a8fb9d3\5.exe" & del C:\ProgramData\*.dll & exit4⤵
- Suspicious use of WriteProcessMemory
PID:2588 -
C:\Windows\SysWOW64\taskkill.exetaskkill /im 5.exe /f5⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
PID:1104
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C:\Windows\SysWOW64\timeout.exetimeout /t 65⤵
- Delays execution with timeout.exe
PID:1016
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