Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 58c8a1aa346d5b28…

MALICIOUS

Office (OLE) / .XLSX

33.5 KB
MD5: cfef1403eddcdabca787778200de76b7 SHA-1: f5e1c29784923284ef1c19e41a12440860cf9537 SHA-256: 58c8a1aa346d5b28556be7749d413e8c0abd7df601c2aa4ec48c9a3b30c7ee4e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model

The OOXML document is encrypted with a default password and contains an embedded OLE object, indicating it's likely an exploit carrier. The presence of an embedded OLE object suggests an attempt to deliver a secondary payload. Further analysis would be required to determine the exact nature of the exploit.

Heuristics 2

  • Default-encrypted OOXML exploit carrier layout high OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPE
    Default-password encrypted OOXML package contains embedded OLE object parts and additional activation/decoy parts. This layout is common in malicious Excel exploit delivery and requires inspecting the decrypted package.
  • Office OOXML encrypted with default VelvetSweatshop password medium OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXML
    OLE EncryptedPackage decrypts with Excel's built-in VelvetSweatshop password. Office opens this transparently, and malware uses it to hide OOXML exploit parts from scanners that only inspect the outer OLE container.