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

Static analysis result for SHA-256 d230e72c97b5441c…

MALICIOUS

Office (OOXML) / .XLSX

730.7 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-20
MD5: 946d8e7f1e43898ba7fb6a16576bebc5 SHA-1: fad1dab9bc0885b33f746c930bc77fe1a927a28d SHA-256: d230e72c97b5441cd8ecd184b7c058f1da5f20df317eea274cab3a0d05fd5b7a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel 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 and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/43VO.AG 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
30829a27f540e1979d9a29d43b296c45405c8938d52289ca687b47ff3fd09fcc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/43VO.AG 1069568 bytes
ooxml_oleobject_00_ole10native_00.bin
3a09a0b8f4c14c041e3fbe3e298249d493266a8b60384d482b8b6c4297727dbf		 ole-package OOXML xl/embeddings/43VO.AG Ole10Native stream: ole10nATIVe 1058771 bytes

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