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

Static analysis result for SHA-256 9f48235294d7ccf9…

MALICIOUS

Office (OOXML) / .XLSX

735.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-06
MD5: 1fc6ea55bc5280aad5971a106f1ea6be SHA-1: 64d70155ed8a330df256685cf76a110682783608 SHA-256: 9f48235294d7ccf96a737e3e73c51ed1573789a20d5b17872af6d24b0c53429a
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability within the Equation Editor component. The document body appears to be a fabricated invoice, potentially a lure to encourage opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rpKplKR.46D 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
558643a135a365693f9ad5b81800e8c9cd1df6ca47c7ceff61d05689d5d558f8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rpKplKR.46D 989184 bytes
ooxml_oleobject_00_ole10native_00.bin
46158aafd66b10e70427cebe20cf2a27e77907fab39939c801dfc4920d9bc9e5		 ole-package OOXML xl/embeddings/rpKplKR.46D Ole10Native stream: OlE10nAtIVe 978557 bytes

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