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

Static analysis result for SHA-256 8210cd364c09b5b7…

MALICIOUS

Office (OLE) / .XLSX

1.31 MB
MD5: c0cfbf27ea18763fdeeb82404904af23 SHA-1: 627b70f25b9f9ba5cacf1a1175c7e05afb3ee2a2 SHA-256: 8210cd364c09b5b7665d75a29ec56177dadd124e374db975a09d3e85253b4ce8
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an encrypted OOXML document that utilizes a default password, indicating an attempt to obscure its malicious contents. High-severity heuristics indicate the presence of an Equation Editor OLE object, which is a known carrier for exploits. The 'OLE_EQUATION_EDITOR' and 'OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY' firings strongly suggest that this object contains a malicious payload, likely exploiting a vulnerability within the Equation Editor to execute arbitrary code. The embedded OLE objects are the primary indicators of the attack vector.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Default-encrypted OOXML embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Default-encrypted OOXML embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is exploit-shaped Equation/OLE payload evidence.
  • 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.

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