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

Static analysis result for SHA-256 e7a5f1c37a043773…

MALICIOUS

Office (OLE) / .XLSX

297.1 KB
MD5: 552f043a7c752ec7e8dddbdf0b36c4d8 SHA-1: cfb4a5bea12cab9a47d3ff1ee1210d444b9a92a4 SHA-256: e7a5f1c37a043773027f4937afb63d3178362113132066c7435b6d716eda6cf2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1559.001 Component Object Model Hijacking: Component and Control Hijacking

The sample is an encrypted Office document, identified as an exploit carrier due to its embedded Equation Editor OLE object. The presence of the 'CVE_2018_0798_EQUATION_NATIVE_ANOMALY' heuristic strongly suggests exploitation of this CVE. The document's encrypted nature and the specific OLE object indicate it's designed to deliver a secondary payload, likely through the Equation Editor vulnerability.

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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