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: 2c4aa7cb34f75764a8a6ca2f7210e1b73d59050a2c3a18abcc11a6ec30de785c
SHA-1: 6d403cbd46faf516e02218ed7b25fe1699a0b261
MD5: bf67682d76203bc8ac1634cf59d22f51
imphash: e60d0e6577962a1096407913ed128742
ssdeep: 3072:IyrN/sVywaEj1UsEOBYJwyrN/sVywaEj1UsZB4Q0zEMa:Nh9wv1Ut3nh9wv1UKB6a
TLSH: T1C83D120B6542E575E6F3BE952C18D25DF8435F1849259DC018022FEBA048B27A9F4FCE
Submitted as: crypto.dll
File type: pe · Size: 130048 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.hmJfa4pdRVd
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 21 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\crypto.dll - b6432dc4f9c0a778b7d171560cf7350415eb54533a02b7fd18bac9a39bac97d6
C:\Windows\System32\net.cpl - b83ccbc7d34ad74f7148bda3fb8a7918207e31a2fdf141d188009167527fe19a
C:\Windows\System32\wlogon.dll - 29bb998dec0b32b7e5bb7cdf00772cc665de30b5b34055c75811b66ac12f9b5a
C:\Windows\System32\lcss.exe - 34abd0af711790c3ab8370d0253bbc99be75af88c0c6b58cd7012f6a115134b3

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=1787660270&P2=404&P3=2&P4=Qb5f%2b%2f7nKqoKTkp9awpvMsObOee%2bCxf4uPBNMjUwvj47H57zIb4Q2eSK9x1bJn7W0IkJiyRub%2bsXDv%2b0xIblRA%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com

Embedded IP addresses

13.89.179.15
52.123.252.232
57.155.104.224
4.230.171.124
4.144.132.223
135.233.95.144
135.232.92.97
20.42.73.24
20.236.44.162
52.123.129.14
52.123.128.14
4.150.223.109
135.234.160.244
52.110.12.51
172.178.240.163
203.26.79.13
52.148.114.188
52.110.12.53
72.153.5.128
20.165.94.46
52.110.12.18

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report