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

Static analysis result for SHA-256 f88870d28161ab6e…

MALICIOUS

Office (OOXML) / .XLSX

700.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-02
MD5: 57c8615ab35bcbc032e003e9ed70abde SHA-1: 4827bae5e8e0789f863673b1af46780ff89d24b9 SHA-256: f88870d28161ab6e5790108a36e22f702ebd518a1c3679dae2e370db4d9f0a0e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size. This strongly suggests the exploitation of a vulnerability within the Equation Editor to embed and execute malicious code. The document body appears to be a fabricated invoice or order form, likely a lure to trick the user into opening the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/u0N.7y 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
c2880e6ee1f50a41c06fe1714684fa829ee892cdca08cd8d3529c92fd70a6bf7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/u0N.7y 1012736 bytes
ooxml_oleobject_00_ole10native_00.bin
be584927b778edc78b44fabccc95d83dbeb3f0e61f70afb51b79382822dfae03		 ole-package OOXML xl/embeddings/u0N.7y Ole10Native stream: OlE10nATIve 1002493 bytes

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