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

Static analysis result for SHA-256 46c496a3a0e6da54…

MALICIOUS

Office (OLE) / .XLSX

119.0 KB First seen: 2022-04-28
MD5: c50507cb9fa7a7450d39598c9fcd9c61 SHA-1: d1b1144cf3de9b49fa7dc502939be2a43fba34b2 SHA-256: 46c496a3a0e6da54292443a804f9122d660a6860c922341a2056ee48de0a269b
160 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 T1059 Command and Scripting Interpreter

The file is an encrypted Office document containing OLE objects, specifically identified as an Equation Editor exploit carrier. The presence of the 'CVE_2018_0798_EQUATION_NATIVE_ANOMALY' heuristic strongly indicates exploitation of CVE-2018-0798 via the Equation Editor. This suggests the document is designed to exploit this vulnerability upon opening, likely leading to the execution of a secondary payload. No document body or scripts were extractable due to encryption.

Heuristics 5

  • 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.
  • 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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