General
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Target
nos_setup.exe
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Size
27.0MB
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Sample
240312-1vc5sabg3t
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MD5
d58531ddd40daa8ca1c3569ac1c0c4d3
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SHA1
07f4c058658f085d434e78febc2365f0b8f25802
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SHA256
5051edf86f5e10baca635c7319b42e0cd2395c1293a9de6b0d45a8236f689207
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SHA512
ee8168434b31dc9d3e708f182af33a59f29fdff706a63947ad78331e15e1fa0e10d048c7c93ef5c6edd1186bece840670fafb951ca496128814d7f3761e774c1
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SSDEEP
786432:GhvmTZFh0juDs1OQc3KsHuuDH3Y4+I6Iao1:evG4uDs1OT3bHDL3Y4aro1
Behavioral task
behavioral1
Sample
nos_setup.exe
Resource
win7-20240221-en
Malware Config
Targets
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Target
nos_setup.exe
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Size
27.0MB
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MD5
d58531ddd40daa8ca1c3569ac1c0c4d3
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SHA1
07f4c058658f085d434e78febc2365f0b8f25802
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SHA256
5051edf86f5e10baca635c7319b42e0cd2395c1293a9de6b0d45a8236f689207
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SHA512
ee8168434b31dc9d3e708f182af33a59f29fdff706a63947ad78331e15e1fa0e10d048c7c93ef5c6edd1186bece840670fafb951ca496128814d7f3761e774c1
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SSDEEP
786432:GhvmTZFh0juDs1OQc3KsHuuDH3Y4+I6Iao1:evG4uDs1OT3bHDL3Y4aro1
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Identifies VirtualBox via ACPI registry values (likely anti-VM)
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Creates new service(s)
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Sets service image path in registry
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ACProtect 1.3x - 1.4x DLL software
Detects file using ACProtect software.
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Checks BIOS information in registry
BIOS information is often read in order to detect sandboxing environments.
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Identifies Wine through registry keys
Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.
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Modifies Windows Firewall
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Writes to the Master Boot Record (MBR)
Bootkits write to the MBR to gain persistence at a level below the operating system.
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Drops file in System32 directory
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Create or Modify System Process
2Windows Service
2Pre-OS Boot
1Bootkit
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Create or Modify System Process
2Windows Service
2Defense Evasion
Impair Defenses
1Disable or Modify System Firewall
1Modify Registry
2Pre-OS Boot
1Bootkit
1Subvert Trust Controls
1Install Root Certificate
1Virtualization/Sandbox Evasion
2