Analysis
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max time kernel
67s -
max time network
148s -
platform
windows10-2004_x64 -
resource
win10v2004-20220812-en -
resource tags
arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system -
submitted
26-11-2022 23:03
Static task
static1
Behavioral task
behavioral1
Sample
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
Resource
win7-20221111-en
Behavioral task
behavioral2
Sample
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
Resource
win10v2004-20220812-en
General
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Target
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe
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Size
194KB
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MD5
1c754baf64c146c547328ac845238ab9
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SHA1
c5069a7506c80831d91f2fadae11a3b6586c9e5e
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SHA256
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b
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SHA512
8585d2d1fb0d16f9f5f9478fb100ef8d1826fe600f95f700261977d3e0d237fb425abfc8dd28d84fe53ed9d73527b6363f681c5bce74dbd559ae7f8e110cd393
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SSDEEP
6144:HDHyVG/j8MmXN6DV5sPYOI+oZCSaRpJ/mir:jSs/AMmXoD3uYOImSaRHuir
Malware Config
Signatures
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Executes dropped EXE 1 IoCs
Processes:
steamwebhelper.exepid process 3108 steamwebhelper.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation 90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe -
Adds Run key to start application 2 TTPs 2 IoCs
Processes:
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exesteamwebhelper.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\steamwebhelper = "C:\\Users\\Admin\\AppData\\Roaming\\steamwebhelper2\\steamwebhelper.exe" 90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\steamwebhelper = "C:\\Users\\Admin\\AppData\\Roaming\\steamwebhelper2\\steamwebhelper.exe" steamwebhelper.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 2 IoCs
Processes:
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exesteamwebhelper.exepid process 4232 90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe 3108 steamwebhelper.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exesteamwebhelper.exedescription pid process Token: SeDebugPrivilege 4232 90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe Token: SeDebugPrivilege 3108 steamwebhelper.exe -
Suspicious use of WriteProcessMemory 2 IoCs
Processes:
90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exedescription pid process target process PID 4232 wrote to memory of 3108 4232 90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe steamwebhelper.exe PID 4232 wrote to memory of 3108 4232 90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe steamwebhelper.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe"C:\Users\Admin\AppData\Local\Temp\90d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b.exe"1⤵
- Checks computer location settings
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe"C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Matrix ATT&CK v6
Replay Monitor
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Downloads
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C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exeFilesize
194KB
MD51c754baf64c146c547328ac845238ab9
SHA1c5069a7506c80831d91f2fadae11a3b6586c9e5e
SHA25690d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b
SHA5128585d2d1fb0d16f9f5f9478fb100ef8d1826fe600f95f700261977d3e0d237fb425abfc8dd28d84fe53ed9d73527b6363f681c5bce74dbd559ae7f8e110cd393
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C:\Users\Admin\AppData\Roaming\steamwebhelper2\steamwebhelper.exeFilesize
194KB
MD51c754baf64c146c547328ac845238ab9
SHA1c5069a7506c80831d91f2fadae11a3b6586c9e5e
SHA25690d6640dbe7472d2f1407157928adc1a33e932421479b47fc1458f7b98211e9b
SHA5128585d2d1fb0d16f9f5f9478fb100ef8d1826fe600f95f700261977d3e0d237fb425abfc8dd28d84fe53ed9d73527b6363f681c5bce74dbd559ae7f8e110cd393
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memory/3108-134-0x0000000000000000-mapping.dmp
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memory/3108-138-0x00007FFE84DB0000-0x00007FFE85871000-memory.dmpFilesize
10.8MB
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memory/3108-139-0x00007FFE84DB0000-0x00007FFE85871000-memory.dmpFilesize
10.8MB
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memory/4232-132-0x0000000000D40000-0x0000000000D76000-memory.dmpFilesize
216KB
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memory/4232-133-0x00007FFE84DB0000-0x00007FFE85871000-memory.dmpFilesize
10.8MB
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memory/4232-137-0x00007FFE84DB0000-0x00007FFE85871000-memory.dmpFilesize
10.8MB