General
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Target
nurpukan.exe
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Size
3.6MB
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Sample
240622-zp1hfstfjf
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MD5
2e63d31a224b50b20cc132d3328b72c4
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SHA1
fa6ee7388b562e31e61e95083efa336352400301
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SHA256
40e30696d6ad195bd0b098a4fca8ef28b8853a5dee92a38d65dc39d90e940aeb
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SHA512
e2b7b43d61fe831af7994827a1374d29f71cc2aa505978448b074755b8252339ce38c4908de6727be6e40accca00b87c182fdeb9fea5733c839c2041b1a5ebf4
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SSDEEP
98304:Ub/suheUpJ461ABv8OqVGHnodeXuP+Nn5kefW7nLu:UDXZpDo0OqeodeXy+Nn2QWe
Behavioral task
behavioral1
Sample
nurpukan.exe
Resource
win7-20240419-en
Behavioral task
behavioral2
Sample
nurpukan.exe
Resource
win10-20240611-en
Behavioral task
behavioral3
Sample
nurpukan.exe
Resource
win10v2004-20240508-en
Behavioral task
behavioral4
Sample
nurpukan.exe
Resource
win11-20240508-en
Malware Config
Targets
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Target
nurpukan.exe
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Size
3.6MB
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MD5
2e63d31a224b50b20cc132d3328b72c4
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SHA1
fa6ee7388b562e31e61e95083efa336352400301
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SHA256
40e30696d6ad195bd0b098a4fca8ef28b8853a5dee92a38d65dc39d90e940aeb
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SHA512
e2b7b43d61fe831af7994827a1374d29f71cc2aa505978448b074755b8252339ce38c4908de6727be6e40accca00b87c182fdeb9fea5733c839c2041b1a5ebf4
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SSDEEP
98304:Ub/suheUpJ461ABv8OqVGHnodeXuP+Nn5kefW7nLu:UDXZpDo0OqeodeXy+Nn2QWe
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DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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Modifies WinLogon for persistence
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Process spawned unexpected child process
This typically indicates the parent process was compromised via an exploit or macro.
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Disables Task Manager via registry modification
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE
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Loads dropped DLL
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Adds Run key to start application
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Drops file in System32 directory
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1