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

Static analysis result for SHA-256 57e709c8c198b51f…

MALICIOUS

Office (OOXML) / .XLSX

747.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-21
MD5: 92e157d37b9980971b4c38e2a754f2ed SHA-1: ef8fe1c1b589e40e35fcea6e1e2cc00e7391901f SHA-256: 57e709c8c198b51f974f591b95ebb94656146ac63036b6c8e07441aa3899908d
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 a vulnerable Equation Editor component. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it's designed to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/uN.qpy 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
c650cdf751efc5ceb85c37be62461456f19c8d40f6d11ac7712e0cf62180b8b6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/uN.qpy 1070080 bytes
ooxml_oleobject_00_ole10native_00.bin
b2846148eca8b200cf870c35ef38fc55855cf2c2a423f19e5bcbd3caa1efa065		 ole-package OOXML xl/embeddings/uN.qpy Ole10Native stream: oLe10naTive 1058974 bytes

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