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

Static analysis result for SHA-256 aee92c23f9139b92…

MALICIOUS

Office (OOXML) / .XLSX

609.6 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: f1a04b378fb51576e0546749789303d7 SHA-1: 49aed450e3278899251c62870f45628608660312 SHA-256: aee92c23f9139b9296b6159f2953ae1625e8a31a97ae110b549e68045bc49b7a
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (OOXML) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. 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, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The presence of this anomalous object points to an attack pattern focused on exploiting the Equation Editor to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3H.VKO 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
1eb2fbc40c29c5df89052c11c4647165f2007eda23c152ed4bdd10e7d834c497		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3H.VKO 881664 bytes
ooxml_oleobject_00_ole10native_00.bin
0f8d85ec6335ed1fa387c9aac0686d7039228c60c3800432154efb7a5b11bd2b		 ole-package OOXML xl/embeddings/3H.VKO Ole10Native stream: oLe10nATivE 872163 bytes

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