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

Static analysis result for SHA-256 30a180699fc63fc1…

MALICIOUS

Office (OLE) / .XLSX

229.2 KB
MD5: fb507b7af63aa439ee18c41542394023 SHA-1: 9b84b2a59176b86533991ce6fdb9e63c32775262 SHA-256: 30a180699fc63fc1b19ce303be1f1e3c4c6e08c5b268499ae954074ebe6781a3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.001 Component Object Model Hijacking

The file is a password-encrypted XLSX document. Heuristics indicate it contains an embedded Equation Editor OLE object, specifically triggering the CVE-2018-0798 detection. This suggests the document is designed as an exploit carrier, likely leveraging a vulnerability within the Equation Editor to execute arbitrary code. No document body or scripts were extractable due to encryption, but the presence of the exploit carrier is a strong indicator of malicious intent.

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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