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

Static analysis result for SHA-256 ea9c52634709cabe…

MALICIOUS

Office (OOXML) / .XLSX

617.9 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-05-16
MD5: 3317d6ae6e7359171306d70aa09e328d SHA-1: 67fb7dbb19e0fdf2ea0126d207aebd2c190078ca SHA-256: ea9c52634709cabe08276c63755ab9ea101cff0aee82543b4233eb5bed134342
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (XLSX) 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 difference, strongly suggesting exploitation of a known vulnerability within the Equation Editor component. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8dhxFt.8rwp 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
217f9c3647e15dbe8c7bdec4f8811bf265496f664b0266d77483acd9835f1e53		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8dhxFt.8rwp 845312 bytes
ooxml_oleobject_00_ole10native_00.bin
6ece96fa8c16dec56a5a5058242e40ca90f80203c07e73bb5960a8fff9310d30		 ole-package OOXML xl/embeddings/8dhxFt.8rwp Ole10Native stream: OlE10natiVe 836243 bytes

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