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

Static analysis result for SHA-256 6dbccb15517b7916…

MALICIOUS

Office (OOXML) / .XLSX

686.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-01
MD5: 2948c06ead3f0348fcf37ef00020a8f0 SHA-1: c31e61aa6dbf0e0c7c5221bbf6f7323e8dc3247d SHA-256: 6dbccb15517b791648d8c1aed44a95820f51bba3acf881a833a333e56bb3f4ba
100 Risk Score

Malware Insights

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

The file is an Excel document 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 with an anomalous header and size, strongly suggesting it's an exploit. This technique is commonly used to deliver malicious content via specially crafted documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/qlY.ER 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
71e9eca5da436fa8bf035be1b1c8b1efa81187991e2d150bf7d4e97ca336e05a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/qlY.ER 1019904 bytes
ooxml_oleobject_00_ole10native_00.bin
3dcbd5a8fda4fa97763c35e1674de7ea71b1f2cfbb83da1b57f8e830e58f8d94		 ole-package OOXML xl/embeddings/qlY.ER Ole10Native stream: olE10NAtIVe 1009651 bytes

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