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

Static analysis result for SHA-256 180cb317ae59a270…

MALICIOUS

Office (OOXML) / .XLSX

624.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-27
MD5: 4647a4e30d1d9b707a0acec4df481ba6 SHA-1: 17384eb4503d3466b98544dfc98b23e64358ef6c SHA-256: 180cb317ae59a270e47b4c9c237c523f98f35867e36a28cf1f29c01ff14cbe18
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (OOXML) file 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 size difference, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/SsYCryXbs.puf 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
6e629093b106d7cad3d5ee9eb152a3136c63685b1c5c8371431c22ae63c68eb3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/SsYCryXbs.puf 923136 bytes
ooxml_oleobject_00_ole10native_00.bin
26e842c6ff99cd773452dd69a6c1e4dce9ce6fe1e29ea107e879a36f5d612037		 ole-package OOXML xl/embeddings/SsYCryXbs.puf Ole10Native stream: OLe10NATivE 913193 bytes

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