General
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Target
Chernobyl.exe
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Size
424KB
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Sample
240303-z5rv9agg4w
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MD5
6e89ee0b1441568348ccfd8ba90ad469
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SHA1
f0c5ae9da26471c08ffd959a86ee62e275423031
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SHA256
4f5f39615e8606648cf5c3d39984da911e1cab5326241185503dc980b51ed1cc
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SHA512
43a8cbc19ebbc289ef40113fd075485332643a8b15d4826cdeb7ec1f128e6c1f9d366b552bfece854a74805101362267615e2fbd13b929e423e3ab431e52d74a
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SSDEEP
6144:cfJzhBb/Lo02222222222222222222222222222222222222222222222222222F:cfJzhqtH05OZzv4TatsNqaJR
Static task
static1
Behavioral task
behavioral1
Sample
Chernobyl.exe
Resource
win7-20240221-en
Malware Config
Targets
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Target
Chernobyl.exe
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Size
424KB
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MD5
6e89ee0b1441568348ccfd8ba90ad469
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SHA1
f0c5ae9da26471c08ffd959a86ee62e275423031
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SHA256
4f5f39615e8606648cf5c3d39984da911e1cab5326241185503dc980b51ed1cc
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SHA512
43a8cbc19ebbc289ef40113fd075485332643a8b15d4826cdeb7ec1f128e6c1f9d366b552bfece854a74805101362267615e2fbd13b929e423e3ab431e52d74a
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SSDEEP
6144:cfJzhBb/Lo02222222222222222222222222222222222222222222222222222F:cfJzhqtH05OZzv4TatsNqaJR
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Contains code to disable Windows Defender
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
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Modifies WinLogon for persistence
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Disables RegEdit via registry modification
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Disables Task Manager via registry modification
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Possible privilege escalation attempt
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Modifies file permissions
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Modifies system executable filetype association
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Modifies WinLogon
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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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Drops file in System32 directory
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Sets desktop wallpaper using registry
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Winlogon Helper DLL
2Event Triggered Execution
1Change Default File Association
1Pre-OS Boot
1Bootkit
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
2Winlogon Helper DLL
2Event Triggered Execution
1Change Default File Association
1