MALICIOUS — crypto.dll

MALICIOUS — crypto.dll is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (98/100), attributed to the Somhoveran family. 6 of 55 detection engines flagged it, exhibiting 3 ATT&CK techniques.

Identification

SHA-256: ad26bc281fee3d7224db6126b63bb16bf3a9426ca22f48f0c09adc504348fab0
SHA-1: 864e17b856f7b3a04c25b26d28c53862f2a7493f
MD5: 498b349826a333e5f4824f102191bef4
imphash: e60d0e6577962a1096407913ed128742
ssdeep: 6144:Nh9wv1Ut3nh9wv1U7LRzMBdhkF5E9yCEL4wWRvds:Nh9wtah9wtGida5E9OL4hHs
TLSH: T13743129226D3C864C1D6FD507D74CA2EBEA28E3019375A400A436BAB745CB135A70BED
Submitted as: crypto.dll
File type: pe · Size: 231936 bytes
Verdict: malicious (98/100) · Family: Somhoveran

Detections (6 of 55 engines)

MalwareAnalyser heuristics (entropy/packer): UPX
ClamAV (daily): Win.Ransomware.Somhoveran-9870372-0
Detect It Easy (packer/type): DIE:Turbo Linker
Microsoft Defender: Trojan:Win32/Vindor!pz
Emsisoft (Emergency Kit): Gen:Trojan.ShellHook.omJfa4pdRVd
Kaspersky (KVRT): Worm.Win32.Wenper.b

MITRE ATT&CK

Why this verdict

The malicious score of 98/100 is the fusion of 8 weighted signals:

ClamAV (daily) flagged Win.Ransomware.Somhoveran-9870372-0 (rule Win.Ransomware.Somhoveran-9870372-0) - engine signal, weight 0.90, confidence 0.95
Observed at runtime: Windows Service (T1543.003) (rule Windows Service) - dynamic signal, weight 0.40, confidence 0.90
1 behavioral detection(s): Windows Service Installation [medium] (rule tl-service-install) - dynamic signal, weight 0.40, confidence 0.90
Contacted 19 external host(s) at runtime (16 HTTP) - network signal, weight 0.40, confidence 0.80
Detect It Easy (packer/type) flagged DIE:Turbo Linker (rule DIE:Turbo Linker) - engine signal, weight 0.35, confidence 0.70
Packing/obfuscation: UPX, high-entropy-sections:UPX1, Turbo Linker - static signal, weight 0.25, confidence 0.55
Dropped 3 executable file(s) at runtime - dynamic signal, weight 0.20, confidence 0.60
Observed at runtime: Modify Registry (T1112) (rule Modify Registry) - dynamic signal, weight 0.12, confidence 0.90

Dynamic analysis (windows)

314 behavior events · 2 ATT&CK techniques · 4 dropped files.

Dropped files

C:\Windows\System32\lcss.exe - bd47df541cf6ad5925bd9142872d5228d1ae7c1e91055f7cfc7072bd98f572cf
C:\Windows\System32\crypto.dll - f355fe63b4b5c2c07106ec2b476b55fb903e6265383fbb0e1bf5d60bc888ba86
C:\Windows\System32\wlogon.dll - c499860503a8883a07218180296b99c82576fb159ecab22ff0bf678db0d76712
C:\Windows\System32\net.cpl - ba0e492d24579f80a32440859014710e25ab3445db14899233a3e94c444e50f8

Embedded URLs

http://www.msftconnecttest.com/connecttest.txt
http://rb.symcd.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTDRSYViRCZTxmZjLENmnwVjLly9QQU1MAGIknrOUvdk%2BJcobhHdglyA1gCEF0QyxjrOnkAh4OrdHf50xk%3D
http://rb.symcb.com/rb.crl
http://203.26.79.13/filestreamingservice//files/753bb2df-a166-494f-aa7d-5678b1ef0c56/pieceshash?cacheHostOrigin=dl.delivery.mp.microsoft.com
http://203.26.79.13/filestreamingservice/files/753bb2df-a166-494f-aa7d-5678b1ef0c56?P1=1787654021&P2=404&P3=2&P4=OJD8Gi931z94sztwU5gCJDl7Hu7a8UJ7k0qfgZOqMeuNd9Y79JUb%2fY2bj6cX%2bwfQIZtC9p261uM%2f99eG7fnuXg%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com

Embedded IP addresses

4.150.223.96
52.253.84.76
57.155.104.224
4.230.171.124
135.232.92.137
74.178.240.51
20.236.44.162
52.123.129.14
40.99.134.2
4.207.44.75
52.123.252.213
203.26.79.13
92.223.78.30
135.234.160.244
72.154.7.97
74.178.76.44
52.110.12.33
52.148.114.188
52.110.12.5

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report