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

Static analysis result for SHA-256 167176baabd95ebe…

MALICIOUS

Office (OOXML) / .XLSX

687.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-16
MD5: 26fdae547a26cd49e1f9cf665560edf0 SHA-1: 12004f784d16dd53746f072bf63ec26734f10db7 SHA-256: 167176baabd95ebef19c6b028f1d87ccee80b9339585792c65e3a1318713f73a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The XLSX file contains an embedded OLE object identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload within its Ole10Native stream, with a declared inner size significantly larger than the actual stream size, suggesting obfuscation or a packed payload. This technique is commonly used to deliver second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fczaK.5VDAA 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
53ad309c0d9c107f1ab0fc199095eacbc9d3341912e59ee713cbd433ff4b0f08		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fczaK.5VDAA 946688 bytes
ooxml_oleobject_00_ole10native_00.bin
a663e590d1f3df3a2282c0ae4de52b9348ee89416fa66c4b746692745dce1792		 ole-package OOXML xl/embeddings/fczaK.5VDAA Ole10Native stream: OLe10NaTiVE 936581 bytes

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