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

Static analysis result for SHA-256 94394fa78d1f2a54…

MALICIOUS

Office (OOXML) / .XLSX

19.4 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: df00b79f4df4660b7980895f35d0a101 SHA-1: 449c6a604330c1e5a94ae2963097a5f93011c332 SHA-256: 94394fa78d1f2a54235bb0f43f81baaffab9ccc464ec089148d1cf08edcd71a1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly within the Equation Editor's native stream, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for arbitrary code execution upon opening the document.

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
080e58b9af4a50cfec7900807a62f92b380fdf646fd91f17b8e237ed338b6b27		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
8e8559d5d2f1cd5cc8200a944738eb8446e5418a83f3cab944c4112d2b52b54a		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10nAtIvE 1779 bytes

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