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

Static analysis result for SHA-256 813ada770726dbda…

MALICIOUS

Office (OOXML) / .XLSX

658.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-10
MD5: 27d950375ed1984bfaec2f7b84557170 SHA-1: 1e52e3c17f6ed445385be8435512d2985927aaae SHA-256: 813ada770726dbda4d60ce0f15f9bdff8a4f02bc64984445027a92e66995eb37
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is an Excel spreadsheet 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 size, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) to execute arbitrary code. The embedded object is the primary vector for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7Vgs78E.p4Qp9 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
7016fa12f313d6c6905f71f8ca314dcf4325f7c84a20cfa763f4e73171896940		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7Vgs78E.p4Qp9 955392 bytes
ooxml_oleobject_00_ole10native_00.bin
bb55bbe0b60100cab183fb3d9c3098011122e3b523311288c34a6cb5f73609f0		 ole-package OOXML xl/embeddings/7Vgs78E.p4Qp9 Ole10Native stream: OLe10NatIVE 945321 bytes

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