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

Static analysis result for SHA-256 f17d3309b0b8e90f…

MALICIOUS

Office (OOXML) / .XLSX

738.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-22
MD5: 51c1004c5ccd5fef11366a75bcd5abdb SHA-1: e6c3aa66452527fe23ca925d33117d96c4579af8 SHA-256: f17d3309b0b8e90f4297a947f0f20ec337d19d2078ad3034ed31117cefd0473e
100 Risk Score

Malware Insights

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

The file is an Office Open XML spreadsheet 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 within its Ole10Native stream, suggesting it's designed to exploit a known vulnerability (likely CVE-2017-11882) to execute arbitrary code. The presence of an embedded OLE object and the nature of the payload strongly indicate a malicious document designed for exploitation.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/urclP.XcHF 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
5b2b83390be38c8c46bd7ba758af4247a5a947020effe4c43764b4299526cb1b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/urclP.XcHF 1011712 bytes
ooxml_oleobject_00_ole10native_00.bin
766a73ceab590f392acb1ec6cb0957d77bdaedbaf6c4ad6de62f64c3f813283f		 ole-package OOXML xl/embeddings/urclP.XcHF Ole10Native stream: olE10nAtIVe 1001177 bytes

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