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

Static analysis result for SHA-256 810ebf5e922fcb6b…

MALICIOUS

Office (OOXML) / .XLSX

604.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-09
MD5: 31f35ca20b780b98ef90ca253bfa0421 SHA-1: d92c44e3605ac94d73b1110d36573716c6b25ebf SHA-256: 810ebf5e922fcb6b70210661fc0285200cbefbd263a15bb8e487546af17c29da
100 Risk Score

Malware Insights

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

The sample is an Office document 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 header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This points to a likely attack pattern involving the exploitation of the Equation Editor to execute arbitrary code or deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/a9W.785dPmq 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
a1599064fe8703b9ae32005e255e34935045ad2aabbb5e5f49a5252042c2bce6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/a9W.785dPmq 828928 bytes
ooxml_oleobject_00_ole10native_00.bin
9029760a02850b8662692736b247ea7e0cc81dcc7978e91fc4a5ba889360d36f		 ole-package OOXML xl/embeddings/a9W.785dPmq Ole10Native stream: Ole10nAtIVE 819942 bytes

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