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

Static analysis result for SHA-256 4a7936d2046d9b11…

MALICIOUS

Office (OOXML) / .XLSX

737.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-01
MD5: 046ab12e0019f04edc6c0985341cfeac SHA-1: 2209f2e9720de83af0b93672642ebef7e36a6102 SHA-256: 4a7936d2046d9b11e44b82f8a8870599504caeb5d65ecd4a0ac2c39d7c3c8a93
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft 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 designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vIsH0jo.jOSOjxT 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
49e0d211ff33fc42156a0bcd0613d5a94b5bd0e545a69be1b18b9d0936c66987		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vIsH0jo.jOSOjxT 1030656 bytes
ooxml_oleobject_00_ole10native_00.bin
ccf8549971364bed57d5bc75b325f5246d0b9c841c426c0db661fcd49b40ac7d		 ole-package OOXML xl/embeddings/vIsH0jo.jOSOjxT Ole10Native stream: OlE10NATIve 1020012 bytes

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