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

Static analysis result for SHA-256 9fe556f2b551c03b…

MALICIOUS

Office (OOXML) / .XLSX

622.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-24
MD5: 7c006d54f00523d977726de9f62348dc SHA-1: 3d85f2b277b673168e5e7c28643c2d249cc23d2b SHA-256: 9fe556f2b551c03b515f2b16004606749a755740963f63b02f71925ff61a448f
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 an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a vulnerability. The presence of this embedded malicious object points towards an attack pattern aimed at exploiting software vulnerabilities for initial compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NkS.1e 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
6314cc84905cdbc7c72d9afa7ac387d29a1b7fc7ed3b89fee0e20196fedcaa1e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NkS.1e 907264 bytes
ooxml_oleobject_00_ole10native_00.bin
db123bda80d658ee86f86ec62172953ce748a6c38b894c41c90ede6a7f332685		 ole-package OOXML xl/embeddings/NkS.1e Ole10Native stream: oLE10NaTive 897894 bytes

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