General
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Target
PianoScrap.exe
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Size
84KB
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Sample
210627-b5l3ms3lss
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MD5
7bca14e2fe5de5d8b6008d5136b3836a
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SHA1
dc3fa497624ec58cd1e2f687b8246e817201b4d5
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SHA256
6145b4b0d7c1cd9f2fb4e5af83194c149867abff5808ed7b185077b75dc05166
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SHA512
1ba56070522c9ec0200e6a35b4365847f176892f82cdb49af650a16f22d385962672acdc248a5cebb21598381c239544db86363e79c88c096638d5075b22ca63
Static task
static1
Behavioral task
behavioral1
Sample
PianoScrap.exe
Resource
win7v20210410
Malware Config
Targets
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Target
PianoScrap.exe
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Size
84KB
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MD5
7bca14e2fe5de5d8b6008d5136b3836a
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SHA1
dc3fa497624ec58cd1e2f687b8246e817201b4d5
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SHA256
6145b4b0d7c1cd9f2fb4e5af83194c149867abff5808ed7b185077b75dc05166
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SHA512
1ba56070522c9ec0200e6a35b4365847f176892f82cdb49af650a16f22d385962672acdc248a5cebb21598381c239544db86363e79c88c096638d5075b22ca63
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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 system executable filetype association
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Registers COM server for autorun
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Creates new service(s)
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Downloads MZ/PE file
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Executes dropped EXE
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Modifies Windows Firewall
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Sets DLL path for service in the registry
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Loads dropped DLL
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Adds Run key to start application
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Checks installed software on the system
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Drops Chrome extension
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Maps connected drives based on registry
Disk information is often read in order to detect sandboxing environments.
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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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