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

Static analysis result for SHA-256 d69b3e8d8c2531cb…

MALICIOUS

Office (OOXML) / .XLSX

605.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-22
MD5: e9a978aa33faa8cc8643eaac79c681a8 SHA-1: 4f94439c07987b5efcb724f26b645673e20531f1 SHA-256: d69b3e8d8c2531cb28becb386beab2e5bfaf91d75e2ea86ace6b6a0d9759d10d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: 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, suggesting it's designed to exploit a vulnerability. This points to a spearphishing attachment attack pattern where the user is tricked into opening the file, leading to the exploitation of the Equation Editor.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/c6Is86v.QDszqKa 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
12799bd646e5c1fa1d94d9aee504797b294dcd3de08cc42f1cbcfda20e109c3f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/c6Is86v.QDszqKa 868864 bytes
ooxml_oleobject_00_ole10native_00.bin
48e2f9d5166bc9360390ad703d345e6f7287452c39b080c5318c05e5e02d93de		 ole-package OOXML xl/embeddings/c6Is86v.QDszqKa Ole10Native stream: Ole10NATiVe 859491 bytes

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