Analysis
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max time kernel
147s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20220901-en -
resource tags
arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system -
submitted
30/10/2022, 20:07
Static task
static1
Behavioral task
behavioral1
Sample
3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe
Resource
win7-20220901-en
windows7-x64
10 signatures
150 seconds
Behavioral task
behavioral2
Sample
3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe
Resource
win10v2004-20220901-en
windows10-2004-x64
10 signatures
150 seconds
General
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Target
3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe
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Size
262KB
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MD5
a0ab1c05677ac2ea5841128669c03400
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SHA1
796ad804fd080d0e4242fd7cc4cbf09d26e5bf31
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SHA256
3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4
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SHA512
04b49dfd7e4c0eeb7aa73756e3ff7129d160a9cdb9f74fb3f31fcd7155aaad8c4edb8862e25850e770093c83225d88e17b250f118432927e0d987356a53506d3
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SSDEEP
6144:5xuthxNhVpcVmcOClV7cN1kyymJuc4E8O:5xcPiIAZdO
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-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0" 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe Set value (int) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\ShowSuperHidden = "0" yuamod.exe -
Executes dropped EXE 1 IoCs
pid Process 932 yuamod.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe -
Adds Run key to start application 2 TTPs 13 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /k" yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /i" yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /v" yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /c" 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /p" yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /o" yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /j" yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /a" yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /t" yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /h" yuamod.exe Key created \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Windows\CurrentVersion\Run\ 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe Key created \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Software\Microsoft\Windows\CurrentVersion\Run\ yuamod.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\yuamod = "C:\\Users\\Admin\\yuamod.exe /b" yuamod.exe -
Maps connected drives based on registry 3 TTPs 4 IoCs
Disk information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum yuamod.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0 yuamod.exe -
Drops autorun.inf file 1 TTPs 1 IoCs
Malware can abuse Windows Autorun to spread further via attached volumes.
description ioc Process File opened for modification C:\Users\Admin\c\autorun.inf yuamod.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe 932 yuamod.exe -
Suspicious use of SetWindowsHookEx 2 IoCs
pid Process 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 932 yuamod.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 1352 wrote to memory of 932 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 80 PID 1352 wrote to memory of 932 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 80 PID 1352 wrote to memory of 932 1352 3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe 80
Processes
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C:\Users\Admin\AppData\Local\Temp\3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe"C:\Users\Admin\AppData\Local\Temp\3c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4.exe"1⤵
- Modifies visiblity of hidden/system files in Explorer
- Checks computer location settings
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1352 -
C:\Users\Admin\yuamod.exe"C:\Users\Admin\yuamod.exe"2⤵
- Modifies visiblity of hidden/system files in Explorer
- Executes dropped EXE
- Adds Run key to start application
- Maps connected drives based on registry
- Drops autorun.inf file
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
PID:932
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
262KB
MD5a0ab1c05677ac2ea5841128669c03400
SHA1796ad804fd080d0e4242fd7cc4cbf09d26e5bf31
SHA2563c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4
SHA51204b49dfd7e4c0eeb7aa73756e3ff7129d160a9cdb9f74fb3f31fcd7155aaad8c4edb8862e25850e770093c83225d88e17b250f118432927e0d987356a53506d3
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Filesize
262KB
MD5a0ab1c05677ac2ea5841128669c03400
SHA1796ad804fd080d0e4242fd7cc4cbf09d26e5bf31
SHA2563c88b9ff5818231a495231b7a906ff6c285a377e3ba16e95026fbe59fcd3e5a4
SHA51204b49dfd7e4c0eeb7aa73756e3ff7129d160a9cdb9f74fb3f31fcd7155aaad8c4edb8862e25850e770093c83225d88e17b250f118432927e0d987356a53506d3