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

Static analysis result for SHA-256 970bc87a3f8d21fb…

MALICIOUS

Office (OLE) / .XLSX

201.6 KB
MD5: c4a0c534b60c9f85ff331377eb2742d9 SHA-1: 6ceded8fb017692c5b1b7114174b13bc6ad1454a SHA-256: 970bc87a3f8d21fbff53165a5b9eb82707da24f88d67c14a0b3059d80bf47456
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Exploitation for Public-Facing Application T1559.001 Component Object Model Hijacking

The sample is a password-encrypted Excel spreadsheet. Static analysis identified an embedded Equation Editor OLE object, a common technique for delivering exploits. Specifically, the heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous Equation Editor native stream properties. No scripts were extracted, and the document body was not available, limiting further analysis of the specific lure or 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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