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

Static analysis result for SHA-256 db795fc96bfafe67…

MALICIOUS

Office (OOXML) / .XLSX

749.7 KB Authoring application: LibreOffice/7.1.0.3$Windows_X86_64 LibreOffice_project/f6099ecf3d29644b5008cc8f48f42f4a40986e4c 12.0000
MD5: 361d84f816fddc46fe1952adbac3f8b6 SHA-1: 57aa8a8cbbd8cb900fc8deb17772ea995cb2178a SHA-256: db795fc96bfafe676baff4982020bf414a611c332e879dd49e140b6a1dac5750
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation. This points to a delivery mechanism leveraging a known vulnerability within the Equation Editor component, likely to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dkHDJx.og contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
b9b6ad5d74a59b14ac5bf5e5a4caf99e94f61595d92c7c0a402a0977e77e8042		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dkHDJx.og 1059840 bytes
ooxml_oleobject_00_ole10native_00.bin
c0f27ef0d55c0639750b817ae865159918753d842341c08d90d8b544186a157c		 ole-package OOXML xl/embeddings/dkHDJx.og Ole10Native stream: OlE10naTIVE 1048705 bytes

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