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

Static analysis result for SHA-256 9d13ac84ad63d41c…

MALICIOUS

Office (OOXML) / .XLSX

11.1 KB Created: 2019-01-14 17:17:08 UTC Authoring application: Microsoft Excel 16.0300
MD5: 636cb36c1f8ebb57adc883fdcce864d1 SHA-1: d6c562c165809438d1b9d87d74e1372d9e741ac9 SHA-256: 9d13ac84ad63d41cfe44d18740193af498ac345ea1332d2759d4f4bc424b12b3
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.001 Component Object Model Hijacking

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream. This strongly suggests the file is designed to exploit this vulnerability to execute arbitrary code. No document body text or scripts were extracted, but the OLE object and exploit heuristic are sufficient to infer the attack pattern.

Heuristics 4

  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
53a428f90bbe46af6b674ab8bfb01bfc92db3ce2facaf6e448f6b74e374f137a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
d3a2f5b68ffbad5ef70db36e50fcfbe45f82a94ef828fd27f5a1dcb275ed1083		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NaTIVe 1842 bytes

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