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

Static analysis result for SHA-256 93e0b4dab465ea87…

MALICIOUS

Office (OLE) / .XLSX

201.6 KB
MD5: add7fa9119e32bf7b846fff3a6b9ed0d SHA-1: 2b07908e42a9f5dfcf6aeca60676bdb477d056b1 SHA-256: 93e0b4dab465ea87342e42a866572fa7446ec240f1f93b0e723133d871e80554
220 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

This Office document is password-encrypted and contains an embedded Equation Editor OLE object. High-severity heuristics indicate this object is anomalous and exploits CVE-2018-0798, a known vulnerability in Equation Editor. The document is structured as an exploit carrier, suggesting it is designed to execute arbitrary code upon opening. No scripts were extracted, but the presence of the exploit carrier and the specific CVE points to a delivery mechanism for a secondary payload.

Heuristics 6

  • 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.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Default-encrypted OOXML contains embedded Equation Editor data with anomalous native stream bytes consistent with a CVE-2018-0798-style exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like.
  • Encrypted Office package with CFB FAT corruption critical OLE_ENCRYPTED_AND_MALFORMED
    Encrypted-package shape co-occurs with FAT-chain corruption — the documented combined evasion form.
  • 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 document is password-encrypted medium OFFICE_ENCRYPTED_PACKAGE
    OLE container holds MS-OFFCRYPTO encrypted package (Standard Encryption (Office 2007, AES)).
  • 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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