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

Static analysis result for SHA-256 ba864e9ef22e34d4…

MALICIOUS

Office (OOXML) / .XLSX

590.0 KB Created: 2023-03-22 14:50:04 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-05-18
MD5: 9fa7dfab7d95565c74a2a604d57c196c SHA-1: 246bf712785e110d285560fa10256c4825552c9a SHA-256: ba864e9ef22e34d47ab088144c212b0add33a7e89f5871d10171bd82efd21ad5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model

The sample is an Excel document containing an embedded OLE object, identified as an Equation Editor. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size. This strongly suggests the object is being used as a dropper for malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/d0xKDQQyQ.9M 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
b08fda89d696f32a131a0e4855bc809dd3df38a97f16d88d21ad904ecdf4e43a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/d0xKDQQyQ.9M 798720 bytes
ooxml_oleobject_00_ole10native_00.bin
7b13916792d4c83ad75d6c794debed10ac3098d8ee24e8a35ca3906459010b76		 ole-package OOXML xl/embeddings/d0xKDQQyQ.9M Ole10Native stream: olE10NaTiVE 789641 bytes

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