MALICIOUS — libwinpthread-1.dll

MALICIOUS — libwinpthread-1.dll is a pe sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (99/100), attributed to the HUILoader family. 4 of 26 detection engines flagged it, exhibiting 2 ATT&CK techniques.

Identification

• SHA-256: 6afb2014d4bf787cc1be6ab92971762b183bb6a2085f6541a27621af8ac34816
• SHA-1: b2852912d7b36bea65221072937daf29c5ff0f4b
• MD5: 923545ac1dd8fd372863a02cf14f4308
• imphash: 449963a8ef999a3396eb6fa434920cbb
• ssdeep: 98304:3FkXEvsPQTUVCd4qf7XqnUK7rbsr4CNj:3KXEvqCaqf7XPwbsDh
• TLSH: T1E7757CB502263090ECBB59B06F4C5A8CF0937169DB33DBD84103EA7E5852537FAA116E
• Submitted as: libwinpthread-1.dll
• File type: pe · Size: 27204608 bytes
• Verdict: malicious (99/100) · Family: HUILoader

Detections (4 of 26 engines)

• YARA: JPCERT/CC: JPCERT_HUILoader_PlugX_SideLoad
• Microsoft Defender: Trojan:Win32/Ravartar!rfn
• Emsisoft (Emergency Kit): Gen:Variant.Yogi.26138
• Kaspersky (KVRT): Trojan.Win64.Agent.smgqti

MITRE ATT&CK

• T1112
• T1218.011

Why this verdict

The malicious score of 99/100 is the fusion of 13 weighted signals:

• Microsoft Defender flagged Trojan:Win32/Ravartar!rfn (rule Trojan:Win32/Ravartar!rfn) - engine signal, weight 0.55, confidence 0.85
• Emsisoft (Emergency Kit) flagged Gen:Variant.Yogi.26138 (rule Gen:Variant.Yogi.26138) - engine signal, weight 0.55, confidence 0.85
• Memory forensics: 2 finding(s), e.g. SSDT hook (rule windows.ssdt.SSDT) - memory signal, weight 0.50, confidence 0.85
• 1 behavioral detection(s): LOLBin: rundll32 suspicious invocation [medium] (rule tl-lolbin-rundll32) - dynamic signal, weight 0.40, confidence 0.90
• 1 behavioral detection(s): LOLBin: rundll32 suspicious invocation [medium] (rule tl-lolbin-rundll32) - dynamic signal, weight 0.40, confidence 0.90
• Contacted 46 external host(s) at runtime (6 HTTP) - network signal, weight 0.40, confidence 0.80
• Contacted 46 external host(s) at runtime (6 HTTP) - network signal, weight 0.40, confidence 0.80
• YARA: JPCERT/CC flagged JPCERT_HUILoader_PlugX_SideLoad (rule JPCERT_HUILoader_PlugX_SideLoad) - engine signal, weight 0.35, confidence 0.70
• Embedded network infrastructure: 4.2.1.0 - static signal, weight 0.35, confidence 0.60
• Observed at runtime: Modify Registry (T1112) (rule Modify Registry) - dynamic signal, weight 0.12, confidence 0.90
• Observed at runtime: Modify Registry (T1112) (rule Modify Registry) - dynamic signal, weight 0.12, confidence 0.90
• Extracted generic config (1 C2) (generic/advisory) - engine signal, weight 0.15, confidence 0.30
• Extracted generic config (1 C2) (generic/advisory) - engine signal, weight 0.15, confidence 0.30

Dynamic analysis (windows)

14280 behavior events · 1 ATT&CK techniques · 0 dropped files.

Runtime network

• 252.0.0.224.in-addr.arpa.
• 3.0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.f.f.ip6.arpa.
• 2.0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.f.f.ip6.arpa.
• wpad
• tas02.sls.update.microsoft.com
• settings-win.data.microsoft.com
• 250.255.255.239.in-addr.arpa
• b.f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.f.f.ip6.arpa
• 3.0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.f.f.ip6.arpa
• 252.0.0.224.in-addr.arpa
• www.msftconnecttest.com
• 2.0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.f.f.ip6.arpa
• login.live.com
• ctldl.windowsupdate.com
• time.windows.com
• ocsp.digicert.com
• v10.events.data.microsoft.com
• desktop-hsgcbep
• 251.0.0.224.in-addr.arpa
• 22.175.184.20.in-addr.arpa

Embedded IP addresses

• 4.2.1.0
• 199.232.138.172
• 23.11.37.157
• 23.40.52.85
• 135.233.45.221
• 135.232.92.137
• 85.210.196.11
• 52.168.112.67
• 20.184.175.22
• 72.145.35.111
• 52.148.114.188
• 23.221.133.182
• 40.126.14.163
• 13.69.116.107
• 135.233.95.80
• 72.153.5.128
• 23.221.133.123
• 23.214.54.132
• 57.155.101.212
• 74.178.76.128
• 203.26.79.13
• 20.42.179.204
• 172.172.255.217
• 74.179.77.204
• 40.84.97.4

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report