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

Static analysis result for SHA-256 20b392ea584a0ad3…

MALICIOUS

Office (OOXML) / .XLSX

517.4 KB Created: 2020-01-20 17:22:23 UTC Authoring application: Microsoft Excel 15.0300
MD5: 43452b31c8f002c92dfa6a2e22c21077 SHA-1: 427725332cfd778a5ff6e1704c1347cbf4f63b38 SHA-256: 20b392ea584a0ad388e394b3f0c0b3c67ec080fb5b49c6ee7421e85e8ca7a68a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1559 Component Object Model Hijacking

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798 due to anomalous Equation Editor native stream data. This suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely leading to the download or execution of a secondary payload. No specific malware family could be identified.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    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
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
41e5aa0118d2e989eae0e5737a7dc44ff5f34d306cf582a0884b057158b6ae43		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
8ca1a59ac653f1c2b359539e7ac36da1de3b280c735d7bf2e0ab91fdaea1f0f9		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10Native 1651 bytes

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