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

Static analysis result for SHA-256 acc86f14cc84e015…

MALICIOUS

Office (OOXML) / .XLSX

717.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-17
MD5: b57ff5ad232b2821751227d44f5da275 SHA-1: 21dab0ad7ca7d54f98a8329abc83040319a0c95f SHA-256: acc86f14cc84e015b1c654946095fa6cdab0372df459070b9bd5dcdffd450397
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Office document 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 size, strongly suggesting it's being used to exploit a vulnerability. The embedded OLE object's filename is 'xl/embeddings/l10i.kUVwhuf' and the anomalous stream is named 'OLE10NaTIvE'.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/l10i.kUVwhuf 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
7566f28c62abc83bc2ad0753456501b113b46400a9978e25fd9adf06aefe6a78		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/l10i.kUVwhuf 1008128 bytes
ooxml_oleobject_00_ole10native_00.bin
41fff6d2548915570f0ded924a6006208c282197f6ead0efbb6c601aff221521		 ole-package OOXML xl/embeddings/l10i.kUVwhuf Ole10Native stream: OLE10NaTIvE 997411 bytes

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