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

Static analysis result for SHA-256 472ffc06e36a6394…

MALICIOUS

Office (OOXML) / .XLSX

600.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 623c07b9e311f32221cee346054398a8 SHA-1: 1af8a2a738d81e0f128dd5f2bf249cea1d744122 SHA-256: 472ffc06e36a63944f300ec881ac6288b5712e5866c453b91e99134f875b758f
100 Risk Score

Malware Insights

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

The sample is an OOXML file 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 being used 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/K6vBeFSv.dO8 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
45fa3909ecd8bab73e2ad9261f2168c3740becb9c588d4afb42588a5e03fcdbd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/K6vBeFSv.dO8 906240 bytes
ooxml_oleobject_00_ole10native_00.bin
60fe7b331f6a6e773dbf729154a48b7a8cec545961b40ce23366dd0037cf4c30		 ole-package OOXML xl/embeddings/K6vBeFSv.dO8 Ole10Native stream: ole10native 896577 bytes

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