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

Static analysis result for SHA-256 4e17b2121074596f…

MALICIOUS

Office (OOXML) / .XLSX

697.8 KB Created: 2020-09-09 18:08:05 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-07-25
MD5: 6861ed52bc98bb04a3a08762a4264f74 SHA-1: f00fea69d69e8285f3d0ac032f4a44935599e1d7 SHA-256: 4e17b2121074596f9b62e717025c7b3858ea3e36bbf1af02d9276dbbdfaeeb1a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model

The sample is an Excel document containing an embedded OLE object, identified as an Equation Editor. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's used for malicious purposes. The embedded OLE object is the primary indicator of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ujj.UTDrY 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
ca5f9bda205e85312620f9e44a13b3e7d3134c2d179228466261345c29869b46		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ujj.UTDrY 881152 bytes
ooxml_oleobject_00_ole10native_00.bin
4ea09fe2aea7e5256c24926a312e000c9b0dc79cd13b2d185cb087a6ff63f81e		 ole-package OOXML xl/embeddings/ujj.UTDrY Ole10Native stream: oLe10naTIVe 871710 bytes

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