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

Static analysis result for SHA-256 2578d187c43d9b1f…

MALICIOUS

Office (OLE) / .XLSX

2.08 MB
MD5: 863e28403b56e2a01cdb052ee07c7ad1 SHA-1: 7d0c3ad4a25bb5b3ef0827ca4214b7816b597c7a SHA-256: 2578d187c43d9b1f7e8afaf322a472c4b73c8b4b4c35c22047932f676ee5902f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1566 Phishing T1059 Command and Scripting Interpreter

The file is an encrypted OOXML document that contains an embedded Equation Editor OLE object. Heuristics indicate this object is anomalous and likely carries a malicious payload, exploiting CVE-2018-0798. The encryption and the use of the Equation Editor suggest a delivery mechanism for a second-stage exploit or malware. No specific family could be identified, but the attack pattern is consistent with exploit-laden documents.

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.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Default-encrypted OOXML embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is exploit-shaped Equation/OLE payload evidence.
  • 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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