MALICIOUS — 91e8f8c35975db6df82e0a3996ae89ed1af6810179f018e4d131ac4ae654116f

MALICIOUS — 91e8f8c35975db6df82e0a3996ae89ed1af6810179f018e4d131ac4ae654116f is a script sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (92/100), attributed to the Base64 family. 4 of 50 detection engines flagged it, exhibiting 1 ATT&CK technique.

Identification

• SHA-256: 91e8f8c35975db6df82e0a3996ae89ed1af6810179f018e4d131ac4ae654116f
• SHA-1: 73bf4a000fa72a50ec965b91d90f0cf4dc85aa98
• MD5: 109f9e8563fdb23cad50bc3b9d600856
• ssdeep: 96:wGjsGPW0aKUuCqVQwODKB57JojU8jSc49SCREnTiw0jG:jtPQKuqVLOD6LwJjS/9SCREnTipG
• TLSH: T1E31832AA3E5261890187733688A712C4C56C7A5E98A6F2A323E3F3691D71F3371093D0
• Submitted as: 91e8f8c35975db6df82e0a3996ae89ed1af6810179f018e4d131ac4ae654116f
• File type: script · Size: 3931 bytes
• Verdict: malicious (92/100) · Family: Base64

Detections (4 of 50 engines)

• capa (capabilities): capability:execution/powershell
• YARA: MalwareAnalyser community pack: TL_Base64_EncodedCommand
• Microsoft Defender: VirTool:PowerShell/Empire.MM!MTB
• Kaspersky (KVRT): HEUR:Trojan.PowerShell.Generic

MITRE ATT&CK

• T1059.001

Why this verdict

The malicious score of 92/100 is the fusion of 6 weighted signals:

• Microsoft Defender flagged VirTool:PowerShell/Empire.MM!MTB (rule VirTool:PowerShell/Empire.MM!MTB) - engine signal, weight 0.55, confidence 0.85
• Kaspersky (KVRT) flagged HEUR:Trojan.PowerShell.Generic (rule HEUR:Trojan.PowerShell.Generic) - engine signal, weight 0.55, confidence 0.85
• Obfuscated powershell script: download, dynamic-exec, encoded-command, defense-evasion (layers: powershell-encodedcommand+base64) (rule script-deobfuscation) - static signal, weight 0.55, confidence 0.75
• execute via PowerShell (rule execute via PowerShell) - capa signal, weight 0.40, confidence 0.80
• YARA: MalwareAnalyser community pack flagged TL_Base64_EncodedCommand (rule TL_Base64_EncodedCommand) - engine signal, weight 0.35, confidence 0.70
• Contacted 1 external host(s) at runtime - network signal, weight 0.12, confidence 0.55

Dynamic analysis (linux)

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

Runtime network

• 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
• desktop-hsgcbep
• 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
• 169.254.255.255
• ff02::1:3
• 224.0.0.252
• ff02::fb
• 224.0.0.251
• 10.240.0.255
• ff02::16
• 10.240.0.1
• ff02::2
• ff02::1
• 239.255.255.250
• 20.165.94.63 US · San Antonio · AS8075 Microsoft Corporation
• 255.255.255.255
• ff02::1:2

Dropped files

• tmp_tmp.8m3eXgcdx6 - 5a0a91ba42575f1e1971fe7190166bb85f137fbc7f8cc7dab166f1b63212f11d

Embedded IP addresses

• 20.165.94.63

File paths

• C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report