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

Static analysis result for SHA-256 e30d9e7a4c81d795…

MALICIOUS

Office (OOXML) / .XLSX

684.1 KB Created: 2023-09-19 06:25:18 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-21
MD5: d37bb75755ac7c989918952c111bca81 SHA-1: 52ec6c9077f32f3f17ae3220d294892363c55116 SHA-256: e30d9e7a4c81d79525ef2d53754180ed97a0c14b6e878ec0679841eb1443dc68
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 presence of an embedded OLE object and the nature of the heuristics strongly point towards an exploit delivery mechanism, likely initiated by a user opening the document.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NgUuNGMeA.gYEge 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
a91efb88ad41358c604210b7f4d615e65b588a03873168c829cd07f951f24167		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NgUuNGMeA.gYEge 975360 bytes
ooxml_oleobject_00_ole10native_00.bin
018d0baae10a75bbc13cdefd90fc47363b29c5551bcac9a50cae075a6f64b90c		 ole-package OOXML xl/embeddings/NgUuNGMeA.gYEge Ole10Native stream: olE10NatIve 965387 bytes

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