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

Static analysis result for SHA-256 62e5c9828c17bbd1…

MALICIOUS

Office (OOXML) / .XLSX

698.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-16
MD5: c399e483f4b00c95e7d47d6ddbc4a476 SHA-1: da228b22fcc07fd2a4e62f2ddcf5b32b3ab31d87 SHA-256: 62e5c9828c17bbd1b16d8c5c0276467c9f4f2e443c64c3d647c2d01f8e27e05f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated by a user opening a malicious attachment.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/XeKloSKol.lNh 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
a5a67f9e5a7245b6bd48c4ad8bcfd7a62f77928a7bc437468b3e007f76b5947c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/XeKloSKol.lNh 1009152 bytes
ooxml_oleobject_00_ole10native_00.bin
fadaed6a92fc689ef1e17a6fc650b655f8e22a1f7077c251c4b716d7efc57dcd		 ole-package OOXML xl/embeddings/XeKloSKol.lNh Ole10Native stream: OLe10natIve 998897 bytes

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