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

Static analysis result for SHA-256 cc61c4b01d7f9c41…

MALICIOUS

Office (OOXML) / .XLSX

740.8 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-02
MD5: dd85f4ff8c44a665ba15385bb02b0a6a SHA-1: 7d196dd57b2714c3c9fb99862ea49b7417b2f706 SHA-256: cc61c4b01d7f9c411c0d45186ed34571d591ba1b89c40b983de4cb47e928c2de
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it is designed to deliver a malicious payload. The presence of this embedded object is the primary indicator of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Ck4vq.qu 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
2ae4360bd30b2773a2318e3bf1816c71ba43ef32df11622aa2f046d209495ff3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Ck4vq.qu 1025024 bytes
ooxml_oleobject_00_ole10native_00.bin
fff7d3b60449e6ebd5dacf4abaaa697d29172c25eb3118be7c3217a3abd9fba7		 ole-package OOXML xl/embeddings/Ck4vq.qu Ole10Native stream: ole10nATive 1014456 bytes

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