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

Static analysis result for SHA-256 fedff7988c603667…

MALICIOUS

Office (OOXML) / .XLSX

605.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-24
MD5: f3b45175c39631633a76b503a5143942 SHA-1: 50034093869509d7a1629f93f8d321f2a2676765 SHA-256: fedff7988c6036671ab6472719d4d5bc1144a7cf2e9faf97031ac13f03e5b30f
100 Risk Score

Malware Insights

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

The file is an Excel 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, suggesting it's designed to exploit a vulnerability. The anomaly in the Ole10Native header and the size discrepancy further support this, pointing towards an exploit attempting to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/n8gplij.xeews 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
52848ea24738c13e5fa74e382ce68e9b097286981894186cd29bbe2b9a25f149		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/n8gplij.xeews 817152 bytes
ooxml_oleobject_00_ole10native_00.bin
e3bd3b2d747a3b885448231663480af1747977f7020552ca8a0b4d5497189f80		 ole-package OOXML xl/embeddings/n8gplij.xeews Ole10Native stream: Ole10nAtIVe 808258 bytes

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