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

Static analysis result for SHA-256 8c8fe2b645a20fbc…

MALICIOUS

Office (OOXML) / .XLSX

682.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-26
MD5: 7bba0f1e8224ca144ddec627bfb93a88 SHA-1: 343f261135b7be5b29329fa2a22743ee89317ea7 SHA-256: 8c8fe2b645a20fbc47b3664fc17653956c24a389d262e646a4ade7c068140fe0
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Office document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability. The embedded OLE object's path and stream name are noted as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/aI.ICf8j 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
87285280fb09cca26cab8cd7da6287a1260e1f215ef61e4c53ed0d33b3c48bfa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/aI.ICf8j 971264 bytes
ooxml_oleobject_00_ole10native_00.bin
028c006410da5cb4a72f4e733b12ae6ec80ee8b509af6ff0e15bd44d6f541353		 ole-package OOXML xl/embeddings/aI.ICf8j Ole10Native stream: oLe10NatIvE 961380 bytes

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