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

Static analysis result for SHA-256 f086531ae9931873…

MALICIOUS

Office (OLE) / .XLSX

94.0 KB First seen: 2022-08-15
MD5: 524063e0665ca2d7675436450f4069b1 SHA-1: 1798fcf4a9a50b204d2ba835e39aedd1cb0318bd SHA-256: f086531ae99318739011645488c4e5adb5b433a4ce37ecdca7941268b70fa3f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559.001 Component Object Model Hijacking T1059 Command and Scripting Interpreter

The sample is an encrypted Office document, identified as an exploit carrier due to its use of an Equation Editor OLE object. The presence of an anomalous Equation Editor native stream and the CVE-2018-0798 heuristic strongly suggest exploitation of this vulnerability. The document's encrypted nature prevents direct analysis of its content, but the exploit carrier structure points to a malicious payload delivery mechanism.

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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