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

Static analysis result for SHA-256 cb851eb427966a44…

MALICIOUS

Office (OOXML) / .XLSX

12.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: e95a18559460ec50cdf5fb596ad17b02 SHA-1: c70ad85fcdc12409591ace5bf90f23ca34471a84 SHA-256: cb851eb427966a445e26aee1c413281408cea21e65525b412aa4eba828f7f17b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The sample is an Office document containing an embedded Equation Editor OLE object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, a vulnerability in the Equation Editor component. This suggests the document is designed to exploit this vulnerability to achieve arbitrary code execution, likely for downloading and executing a second-stage payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the provided evidence.

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
c71e237b80230ac44a537e20c2a5a3193b53b9b4efb440939adc546b32059c23		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
dde77436b9be80f8ac07f67467e13316f6fd9755086e38264b9d2aa5833d7a9c		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10nATIve 1550 bytes

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