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

Static analysis result for SHA-256 89b992d3a46a997c…

MALICIOUS

Office (OOXML) / .XLSX

746.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-21
MD5: 79e6ea6481993f6ac2cbd0812f8aa1e9 SHA-1: 71df7fc8d3d680fb406a253b8754be9abe578ca6 SHA-256: 89b992d3a46a997c2d134167ac5d6da0ed160d7c55b6b607d34954ea973dcf45
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded Equation Editor OLE object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream, suggesting it's designed to exploit vulnerabilities within the Equation Editor component. The large declared inner size compared to the stream size further points to a potential buffer overflow or similar exploit. The document body content appears to be a fabricated invoice, likely a lure to encourage opening the malicious object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/F7tubA.XfMIrk 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
7dc5d904b415a280ee06554aa8112b0b575db7c579d55b712b1b477437976956		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/F7tubA.XfMIrk 1011712 bytes
ooxml_oleobject_00_ole10native_00.bin
df15f89793bdb702edac5d708cf43888c72bf2a93efa7cdcb2ca59d5e32dfa70		 ole-package OOXML xl/embeddings/F7tubA.XfMIrk Ole10Native stream: ole10NAtive 1001321 bytes

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