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

Static analysis result for SHA-256 c54230ce830089e8…

MALICIOUS

Office (OOXML) / .XLSX

698.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-21
MD5: 11a362f5d7b791240bb59bd960c8a8c2 SHA-1: 565846f0c79b0bfecaef8ca64a080cba06cbec93 SHA-256: c54230ce830089e81b74d79aa27d0c335cecf9e9b6f611310242cfeae49659a0
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a known vulnerability such as 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/ltqni.cKqjS5 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
a76647068169058edcef45f73e26709bae5a9bd1c5bdd34b8a25da2fd9aa9990		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ltqni.cKqjS5 1040896 bytes
ooxml_oleobject_00_ole10native_00.bin
2ac8b36c3e4f9f2c7744ec06ae1069c70495ba041a411f66d36aad7796184503		 ole-package OOXML xl/embeddings/ltqni.cKqjS5 Ole10Native stream: OLE10NATIVE 1030346 bytes

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