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

Static analysis result for SHA-256 dca1bbe366193fa0…

MALICIOUS

Office (OOXML) / .XLSX

597.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-10-06
MD5: 2b2b89ac962ffdd39096be0b76bb184b SHA-1: 6bac70c673543e8d4f5c9e3143b860d9841fd4fd SHA-256: dca1bbe366193fa0bc12a708f3873a5fc0ca9c56378c2275e24d9ed37034e9d6
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream, suggesting it's designed to execute malicious code. The document body itself is formatted as a purchase order, a common lure for social engineering attacks.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ZciRBM8X1.8YFTFJw 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
4d7dce049c353270f0dd98b15db31e3a00a472affcda8d4d4af8bd68f3e2eb95		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ZciRBM8X1.8YFTFJw 814592 bytes
ooxml_oleobject_00_ole10native_00.bin
fa06d428152913e5f23fa9ed89136010e28d5de6b1699fa24ad9545a01448ca6		 ole-package OOXML xl/embeddings/ZciRBM8X1.8YFTFJw Ole10Native stream: oLe10NAtIVe 805418 bytes

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