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

Static analysis result for SHA-256 19565d82969fa3ba…

MALICIOUS

Office (OOXML) / .XLSX

722.5 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: f581a22141cfca088686fb56530c206c SHA-1: 81ab888391caf83d839c347145ba85c88f980744 SHA-256: 19565d82969fa3ba5cc912d89706e72b0b04c69de891abe9801a259fa5ccc0ab
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.001 Malicious Link

The sample contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor. The presence of this object is the primary indicator of malicious intent, likely to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Pk2EiYnec.YJ2Ix 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
0d5b736286c770d36f9dd7b1cf6146642d4658c6c6404623f9e38fbce02fb081		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Pk2EiYnec.YJ2Ix 985088 bytes
ooxml_oleobject_00_ole10native_00.bin
fac6f6601fa7515ee1684be597be1ad0c53c1db8a12821f40831b40906d81c00		 ole-package OOXML xl/embeddings/Pk2EiYnec.YJ2Ix Ole10Native stream: olE10natiVe 974691 bytes

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