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

Static analysis result for SHA-256 d217b5c8d076eafa…

MALICIOUS

Office (OOXML) / .XLSX

823.0 KB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: a6e9c677de099edcb53e6e5b1b618e68 SHA-1: 78a6e7ff6a7f584481d99919458b990a6945fa0c SHA-256: d217b5c8d076eafa8a8cde6b80fe27a2cb79c27e52ea1d1cd26a27d6159c0b1c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798, a vulnerability in Equation Editor that allows for arbitrary code execution. This suggests the file is designed to exploit this vulnerability to deliver a malicious payload.

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
7a4a3cfbd1e93666116428c4e327c7ab34ab37e59735377f1f42de936c7b4338		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
06b13b02acc52ac0e0c19b0a9ec81f00c0205f6cc3f1607c09b9404882f283ac		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10nATivE 1439 bytes

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