General
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Target
EIS.7z
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Size
4.5MB
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Sample
210901-1825s4jkrx
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MD5
e1dac45d856eb4f1752296bb575f499a
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SHA1
b4a724f4b840cc1b6a252aa2f6343843e4a837c0
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SHA256
71cce9f320438c262364504a1b0f735f312a399063cce4336d9606ff5950b336
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SHA512
537c4f54226e44a572a844e522a24d436c729a2ca8455d0eb03d84c3febcbe6c440dd64c48537024ea68b3a2607f0cec3520e6aa3748b508184af260c4955a69
Static task
static1
Behavioral task
behavioral1
Sample
EIS.exe
Resource
win7v20210408
Behavioral task
behavioral2
Sample
EIS.exe
Resource
win10v20210410
Malware Config
Extracted
C:\1rWCqamCt.README.txt
blackmatter
http://supp24maprinktc7uizgfyqhisx7lkszb6ogh6lwdzpac23w3mh4tvyd.onion/5PBOYRSETHVDBDPTL
Extracted
blackmatter
2.0
b8726db5d916731db5625cfc30c4f7d9
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attempt_auth
false
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create_mutex
false
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encrypt_network_shares
true
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exfiltrate
false
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mount_volumes
true
Targets
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Target
EIS.exe
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Size
4.8MB
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MD5
3df675b0800e6fc57c81271c440327c4
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SHA1
361aaa051121753358ea49bfd05716cdd38fe492
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SHA256
c3cc8efd60b85139c9b9f4c62c56ffbafde26c1b22cd7b339a371afde7fc513b
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SHA512
321f4b2e5dda2b39268ea057df02f49e96a6ab8461fa9e0ed970202b9a934e816f4885c33534dad35f0301fb1046303a9d2b2207293947997db54e307cc4f06b
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BlackMatter Ransomware
BlackMatter ransomware group claims to be Darkside and REvil succesor.
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Modifies extensions of user files
Ransomware generally changes the extension on encrypted files.
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Enumerates connected drives
Attempts to read the root path of hard drives other than the default C: drive.
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Sets desktop wallpaper using registry
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Suspicious use of NtSetInformationThreadHideFromDebugger
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