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

Static analysis result for SHA-256 411381d397c99aab…

MALICIOUS

Office (OOXML) / .XLSX

8.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: c929bbead4a57e17f8f94f1664d76591 SHA-1: f5de741cf54cbb42646f14e80afcf2cc576f2a11 SHA-256: 411381d397c99aabf836fa423157ade3a9862b46795816892b413e8e481593be
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the file is designed to execute arbitrary code upon opening, likely as a dropper or initial access vector.

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
f4ad29006a39f18a85abf85c9882d79d690955023cd5ead03c49490b381df37d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
6bdb270f5a5971c4805e8594121b0c1cbb1833f0bd048d99be2847d02f1b0bfe		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NatIVe 2041 bytes

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