MALICIOUS — aa54be78a4d7d8c49138b5d4de8b7bbab3e739ede5a557109a15e301c4e5ad28

MALICIOUS — aa54be78a4d7d8c49138b5d4de8b7bbab3e739ede5a557109a15e301c4e5ad28 is a script sample analyzed by MalwareAnalyzer by Cyble with a malicious verdict (94/100), attributed to the Base64 family. 4 of 54 detection engines flagged it, exhibiting 1 ATT&CK technique.

Identification

• SHA-256: aa54be78a4d7d8c49138b5d4de8b7bbab3e739ede5a557109a15e301c4e5ad28
• SHA-1: b0b93529d2922bcb170e2dbadcb752aa0a497d91
• MD5: 883e199b2473690fa745ca1607a7a1f6
• ssdeep: 96:xXjT6T/vXhDGR8jyhwjVNL/w+kKzdTw35AA6/nG/SVO4fdmXEmDtb:NjqvXhjyhwhJ9sdjDtb
• TLSH: T1321F5E095E71BFA60C51AF21425F36CAC2E161648102F0D0F9D8907DEE7AFB13965BE2
• Submitted as: aa54be78a4d7d8c49138b5d4de8b7bbab3e739ede5a557109a15e301c4e5ad28
• File type: script · Size: 7248 bytes
• Verdict: malicious (94/100) · Family: Base64

Detections (4 of 54 engines)

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

MITRE ATT&CK

• T1059.001

Why this verdict

The malicious score of 94/100 is the fusion of 6 weighted signals:

• Microsoft Defender flagged Trojan:PowerShell/Rozena.HNAB!MTB (rule Trojan:PowerShell/Rozena.HNAB!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: encoded-command, shellcode-injection (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 0.45, confidence 0.70
• capa (capabilities) flagged capability:execution/powershell (rule capability:execution/powershell) - engine signal, weight 0.35, confidence 0.70

Dynamic analysis (windows)

1170 behavior events · 0 ATT&CK techniques · 0 dropped files.

Runtime network

• www.msftconnecttest.com
• rb.symcd.com
• rb.symcb.com
• inference.location.live.net
• c.pki.goog
• x2.c.lencr.org
• ye.c.lencr.org
• yr.c.lencr.org
• 250.255.255.239.in-addr.arpa
• ntp.ubuntu.com
• desktop-hsgcbep._dosvc._tcp.local
• desktop-hsgcbep(1)._dosvc._tcp.local
• http://www.msftconnecttest.com/connecttest.txt
• http://rb.symcd.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTDRSYViRCZTxmZjLENmnwVjLly9QQU1MAGIknrOUvdk%2BJcobhHdglyA1gCEF0QyxjrOnkAh4OrdHf50xk%3D
• http://rb.symcb.com/rb.crl
• http://c.pki.goog/r/r1.crl
• http://x2.c.lencr.org/
• http://ye.c.lencr.org/
• http://c.pki.goog/wr2/9UVbN0w5E6Y.crl
• http://yr.c.lencr.org/

Embedded URLs

• http://www.msftconnecttest.com/connecttest.txt
• http://rb.symcd.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTDRSYViRCZTxmZjLENmnwVjLly9QQU1MAGIknrOUvdk%2BJcobhHdglyA1gCEF0QyxjrOnkAh4OrdHf50xk%3D
• http://rb.symcb.com/rb.crl
• http://c.pki.goog/r/r1.crl
• http://x2.c.lencr.org/
• http://ye.c.lencr.org/
• http://c.pki.goog/wr2/9UVbN0w5E6Y.crl
• http://yr.c.lencr.org/

Embedded domains

• x2.c.lencr.org
• ye.c.lencr.org
• yr.c.lencr.org

Embedded IP addresses

• 72.145.35.97
• 72.153.5.138
• 20.50.201.201
• 40.84.97.4
• 52.123.252.245
• 52.110.12.52
• 57.155.104.224
• 4.230.171.124
• 74.178.240.61
• 51.116.246.104
• 74.179.77.204
• 4.150.223.98

File paths

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

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Analyzed on MalwareAnalyzer by Cyble · Open interactive report