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: b0a08ebc479c53c52098057b8465266bae9294247b785b8df86c93cdbb0f8742
SHA-1: 77015f43f78cb98ca9390310ca07fdbf1398118a
MD5: 769dad800b1d5b1f32de6f250766f8c4
imphash: e60d0e6577962a1096407913ed128742
ssdeep: 3072:IyrN/sVywaEj1UsPyrN/sVywaEj1UsEOBYJIpLhI8YV76FU:Nh9wv1U7h9wv1Ut3KLhIH70U
TLSH: T17E3E120B2542E4B9D6E3BC640C18C25DE8111F64093A198059037FFF512EB9B69A4EDE
Submitted as: lcss.exe
File type: pe · Size: 147456 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): crypto.dll - 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 20 external host(s) at runtime (14 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)

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

Dropped files

C:\Windows\System32\crypto.dll - f51f2258313336b37a36f4bcee2e4782a1d235bfe398c59d17e5ec211b77d86d
C:\Windows\System32\lcss.exe - 6c4e85bcf429c2edcb2db34112f730f0543f7dc2af8e8d7075e81ed3fe70b657
C:\Windows\System32\wlogon.dll - 584db1d3dd8d41bb4c19370467950b6aea13b567f8637fe5817ce8fff795b887
C:\Windows\System32\net.cpl - b292ea8f23a188c61a445c3ae32a762944603add3f8029db4c6adc63b007f855

Embedded URLs

http://www.msftconnecttest.com/connecttest.txt
http://rb.symcd.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTDRSYViRCZTxmZjLENmnwVjLly9QQU1MAGIknrOUvdk%2BJcobhHdglyA1gCEF0QyxjrOnkAh4OrdHf50xk%3D
http://rb.symcb.com/rb.crl

Embedded IP addresses

52.123.252.215
52.168.117.171
4.230.171.124
20.42.179.204
52.230.59.222
74.178.76.128
135.232.92.97
52.182.141.63
135.232.92.137
20.231.239.246
52.123.129.14
40.99.134.2
52.123.128.14
135.233.45.222
72.154.7.100
52.123.252.192
20.165.94.46
52.110.12.30
52.148.114.188
52.110.12.37

More JmJfa4pdRVd samples · Latest analyzed threats · ATT&CK coverage

Analyzed on MalwareAnalyzer by Cyble · Open interactive report