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

Static analysis result for SHA-256 7ff3c27e3f0f3fe0…

MALICIOUS

Office (OOXML) / .XLSX

651.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-15
MD5: c9c95086cada20ec58e81df4939275e2 SHA-1: 14da9c91b228cffaa77ae98816df544554f615b1 SHA-256: 7ff3c27e3f0f3fe03a183c55cc1ff5e9d18113387bc8f95e11d51c37a14292d0
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (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 size, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882). This technique is commonly used to deliver a second-stage malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8le.xNiPwTe 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
456c9a3c07a01977cd139f85dd1c1eed895f5769628ce1636bf4e3193b93dbc7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8le.xNiPwTe 926720 bytes
ooxml_oleobject_00_ole10native_00.bin
a0a6a5ef18290b7adbba4e6d8e7179c40796f6718ca778ce7e5aff769808ce86		 ole-package OOXML xl/embeddings/8le.xNiPwTe Ole10Native stream: OLe10NaTiVe 916679 bytes

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