Analysis
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max time kernel
154s -
max time network
157s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
30/10/2022, 19:46
Static task
static1
Behavioral task
behavioral1
Sample
83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe
Resource
win7-20220901-en
windows7-x64
8 signatures
150 seconds
Behavioral task
behavioral2
Sample
83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe
Resource
win10v2004-20220812-en
windows10-2004-x64
9 signatures
150 seconds
General
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Target
83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe
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Size
288KB
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MD5
a17137bc6390e6cf6647ee0f796383b0
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SHA1
a394b72183c75bf262bb9599ac972a6ff544a19a
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SHA256
83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066
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SHA512
35b15fab9488c97066e7a42fc32f8db8c9baa1ec6e7f0648be05898a4ea961ed0ce65be8a52a1de36ae09c4445dc5e51567a3c84f625a1323bc9d9e2bfed1ba8
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SSDEEP
3072:j6yd9jWW6mPEMM2RIYT5F9bVJxnCRcCOzkfpnBSpv1zGifTA3gt8JJ9Kf5L/S6WF:j6qWnmPEMxIAfxnHC9yqJC5L/u
Score
10/10
Malware Config
Signatures
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Modifies visiblity of hidden/system files in Explorer 2 TTPs 2 IoCs
description ioc Process Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0" yooim.exe Set value (int) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0" 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe -
Executes dropped EXE 1 IoCs
pid Process 4972 yooim.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe -
Adds Run key to start application 2 TTPs 29 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /o" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /m" yooim.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Windows\CurrentVersion\Run\ yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /i" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /z" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /y" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /n" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /q" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /j" yooim.exe Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Software\Microsoft\Windows\CurrentVersion\Run\ 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /t" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /u" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /e" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /w" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /x" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /l" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /g" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /c" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /p" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /f" 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /v" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /s" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /f" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /k" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /d" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /r" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /b" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /a" yooim.exe Set value (str) \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yooim = "C:\\Users\\Admin\\yooim.exe /h" yooim.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000_Classes\Local Settings 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 1200 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe 1200 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe 4972 yooim.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 1200 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe 4972 yooim.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 1200 wrote to memory of 4972 1200 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe 80 PID 1200 wrote to memory of 4972 1200 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe 80 PID 1200 wrote to memory of 4972 1200 83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe 80
Processes
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C:\Users\Admin\AppData\Local\Temp\83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe"C:\Users\Admin\AppData\Local\Temp\83c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066.exe"1⤵
- Modifies visiblity of hidden/system files in Explorer
- Checks computer location settings
- Adds Run key to start application
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1200 -
C:\Users\Admin\yooim.exe"C:\Users\Admin\yooim.exe"2⤵
- Modifies visiblity of hidden/system files in Explorer
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
PID:4972
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵PID:4504
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
288KB
MD5a17137bc6390e6cf6647ee0f796383b0
SHA1a394b72183c75bf262bb9599ac972a6ff544a19a
SHA25683c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066
SHA51235b15fab9488c97066e7a42fc32f8db8c9baa1ec6e7f0648be05898a4ea961ed0ce65be8a52a1de36ae09c4445dc5e51567a3c84f625a1323bc9d9e2bfed1ba8
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Filesize
288KB
MD5a17137bc6390e6cf6647ee0f796383b0
SHA1a394b72183c75bf262bb9599ac972a6ff544a19a
SHA25683c1c4dd39ea0baf92afab8dfc7d589873c270fbbb5358ce0591643c2f020066
SHA51235b15fab9488c97066e7a42fc32f8db8c9baa1ec6e7f0648be05898a4ea961ed0ce65be8a52a1de36ae09c4445dc5e51567a3c84f625a1323bc9d9e2bfed1ba8