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

Static analysis result for SHA-256 b68876f81b03e4a5…

MALICIOUS

Office (OOXML) / .XLSX

65.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 9327ec628f53b685e8056dd4668efe79 SHA-1: bafc09cb1ebcddc9adaf41209c544c88b05cabcd SHA-256: b68876f81b03e4a504742ce0b1892448fff9fb15c37f57625baac14131fa07bd
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document 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, which is a known vulnerability for arbitrary code execution. This suggests the document is designed to exploit this vulnerability upon opening.

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
a046af32579f4b70861533670566c7026893d56265fca42f270c3274789550f8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
94ade492057f4c0401b8f74a20b7d7610ae6c74aad5edc3458109afd67b60bc7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NatIve 2134 bytes

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