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

Static analysis result for SHA-256 9027f7fe38d5b0cc…

MALICIOUS

Office (OOXML) / .XLSX

603.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-01
MD5: f6d8f5a4b35004316a5e8c1d60d40ea5 SHA-1: 24bedd01c1dee9bfb109668e0259436daa3faaf7 SHA-256: 9027f7fe38d5b0cc25551291e60c56ba13bc7592874345d7a76cb60aaf697d50
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits anomalies in its Ole10Native stream, indicating it carries a payload. This suggests the file is designed to exploit a vulnerability within the Equation Editor to execute malicious code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5so.six 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
a080b3a6855ee4d8ee4732894c890e5f0b76e4f70a9a48f891d35545e447a02a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5so.six 825856 bytes
ooxml_oleobject_00_ole10native_00.bin
d3cbd3ba3781b9fce6a6e7aa2e4ebd311c7f126774818e55bfcd3c18f8cd381e		 ole-package OOXML xl/embeddings/5so.six Ole10Native stream: ole10NaTIVe 816963 bytes

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