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

Static analysis result for SHA-256 f90d09a311d0e284…

MALICIOUS

Office (OOXML) / .XLSX

703.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-31
MD5: 5a1c85e83a182021a3ee0f33492f214f SHA-1: 7f2d09a9c4636856e8c87333b17a16e5c208233c SHA-256: f90d09a311d0e28454028e623a88fd7ca61ee427c7b9ab1d200c9ca8ceae0be2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 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 is formatted as a purchase order, likely a lure to encourage users to interact with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/IO6aH0.TV 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
97770414a180fb2a83809b311bac4cd2b78c86e59d8e82ef44d9faa2c7328924		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/IO6aH0.TV 934912 bytes
ooxml_oleobject_00_ole10native_00.bin
5855dd40959b56a352ac69f028f4f704a6b391d357523e15c6531f579e19e2fc		 ole-package OOXML xl/embeddings/IO6aH0.TV Ole10Native stream: OLE10NaTiVe 924766 bytes

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