MALICIOUS — lcss.exe

MALICIOUS — lcss.exe is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (99/100), attributed to the JmJfa4pdRVd family. 6 of 55 detection engines flagged it, exhibiting 3 ATT&CK techniques.

Identification

SHA-256: d7a3adc78a92a25d4a6bea049c58b5ef5b94f9918c96a7152c9f47cccc0c629f
SHA-1: a4d023ea188e6282efb8688b3b09726d9107565b
MD5: be3ecad1e4b2a17940b9ab2649a7d684
imphash: e60d0e6577962a1096407913ed128742
ssdeep: 3072:IyrN/sVywaEj1UsPyrN/sVywaEj1Us10nfNhUwwt3n2J9FWO:Nh9wv1U7h9wv1Uv4wwt3nWFT
TLSH: T18D3F020AB591D0BDE9C679EC0C58E32DB8061A2C52354AC0B9423B5F902D7B768CCB9D
Submitted as: lcss.exe
File type: pe · Size: 155648 bytes
Verdict: malicious (99/100) · Family: JmJfa4pdRVd

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.jmJfa4pdRVd
Kaspersky (KVRT): Worm.Win32.Wenper.b

MITRE ATT&CK

Why this verdict

The malicious score of 99/100 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
Dropped a malicious payload (Somhoveran): lcss.exe - dynamic signal, weight 0.62, confidence 0.90
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
Observed at runtime: Modify Registry (T1112) (rule Modify Registry) - dynamic signal, weight 0.12, confidence 0.90

Dynamic analysis (windows)

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

Dropped files

C:\Windows\System32\lcss.exe - 6409fbf67f3d67fe6d1d38ba3ee2a14d2cbd90e79b489055032b3168cbfb488a
C:\Windows\System32\wlogon.dll - d6eb0d4d9fc61e19456292bcaac494a2d3201a22d8a8826089c758c78a53b009
C:\Windows\System32\crypto.dll - fe2d75ebc10297f29d50b112b313fd719f6788031972ec76db60282828a33bc7
C:\Windows\System32\net.cpl - 3f820f5eeea4052ad7817e29b3be4f9536f2421ee390508b134a6aa38f1727fe

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=1787647207&P2=404&P3=2&P4=VWTLd15j8YIcrgtpzITpbpzygBhUQ6uZ2azdq3QRfW1Yao2yMAf4Dqe%2f0KgkegjgsTA96W8oZ4Y05Ak2NSs9OQ%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com

Embedded IP addresses

203.26.79.13
51.104.15.253
4.144.132.223
4.230.171.124
74.178.240.61
51.116.246.104
40.84.97.4
74.178.240.51
52.123.128.14
20.76.201.171
52.123.129.14
51.132.193.105
135.233.95.80
172.178.240.161
52.123.252.212
52.148.114.188
72.154.7.104
52.110.12.28
52.110.12.47

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report