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

Static analysis result for SHA-256 fdb06318c6aeff1e…

MALICIOUS

Office (OOXML) / .XLSX

599.0 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: 5c89bc42ee54df2b5a0e40f4e28ca03b SHA-1: f26bd8415929af792ccbbd27c82a49afd732bc58 SHA-256: fdb06318c6aeff1ecb89b2b6f07ff18b88c8af5647101be0af938f1c00369d3d
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream, indicating it's designed to exploit a vulnerability. The high entropy and size anomaly within the Ole10Native stream further suggest it contains executable code or a secondary stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lv.ZBfAvG6 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
4668a32af7d1d6b8ebedff36f94b55219fc277a7adbdb12dcffaf9f844c77bb4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lv.ZBfAvG6 876544 bytes
ooxml_oleobject_00_ole10native_00.bin
3eeddedf78fd0c78ea6d2140fd334f4aae8584fb160392357c22300045a98284		 ole-package OOXML xl/embeddings/lv.ZBfAvG6 Ole10Native stream: OlE10native 866901 bytes

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