MALICIOUS — lcss.exe

MALICIOUS — lcss.exe is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (99/100), attributed to the MmJfa4pdRVd family. 6 of 55 detection engines flagged it, exhibiting 3 ATT&CK techniques.

Identification

SHA-256: 42431bd7f6a7a5492f5ff8735c3a319c324647b778ff8ea265f16e8b9f0a4b66
SHA-1: 2846f731f7a10fd20f4a0706d12e661f70a5365f
MD5: 9fac7f69f2e8d9081bbee6390e353431
imphash: e60d0e6577962a1096407913ed128742
ssdeep: 6144:Nh9wv1U7h9wv1Ut30jj6309RNy7DqGXUfs:Nh9wtMh9wtZjj1No51
TLSH: T1794212077641D5BCD4D3B4697C59A34CECA19F24043979803A066FDEA01CBAFE294E8E
Submitted as: lcss.exe
File type: pe · Size: 203264 bytes
Verdict: malicious (99/100) · Family: MmJfa4pdRVd

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.mmJfa4pdRVd
Kaspersky (KVRT): Worm.Win32.Wenper.b

MITRE ATT&CK

Why this verdict

The malicious score of 99/100 is the fusion of 9 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): crypto.dll - dynamic signal, weight 0.62, confidence 0.90
Memory forensics: 6 finding(s), e.g. RWX/private injected region in powershell.exe (pid 2568) (rule windows.malfind.Malfind) - memory signal, weight 0.60, confidence 0.85
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 20 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)

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

Dropped files

C:\Windows\System32\crypto.dll - 22ba380cd6a002dade8bfe8b2772bade716e05a40b4d89970a031d363b0b97c3
C:\Windows\System32\lcss.exe - d301572e3b370c72b2fc67ccd8df5924d5cabc3d09aff098930d641a80493bb7
C:\Windows\System32\wlogon.dll - 858d3ec0a74b2e1569e9a4d80ec7a3c4f9b2a02d9b5b47b225a1a393e1602db7
C:\Windows\System32\net.cpl - eae01d4b401bb214972e5773e9087f8c63cf7ac77dfda4f81e6c8fa9ee971785

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=1787637647&P2=404&P3=2&P4=TrkKz%2bI5PH%2bzLpBtXT8aV1MBLBTUqXmZAm%2fNc2xjndpvcl9ye1OPL%2bhhqdgZugsd3z8bJong9%2fb3PNdHDCZVzw%3d%3d&cacheHostOrigin=msedge.b.tlu.dl.delivery.mp.microsoft.com

Embedded IP addresses

20.42.65.84
20.247.184.197
4.230.171.124
20.42.179.192
20.165.94.63
135.232.92.97
51.104.15.252
52.123.128.14
20.231.239.246
52.123.129.14
20.50.73.14
52.123.252.231
172.178.240.163
203.26.79.13
92.223.78.30
74.179.71.159
52.148.114.188
72.145.35.100
52.110.12.56
52.110.12.48

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report