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

Static analysis result for SHA-256 09bde1c718e526b4…

MALICIOUS

Office (OOXML) / .XLSX

610.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: cfcf564d7bcd05f1e103844d3940c35a SHA-1: a4f6d1c5d000673d6f08429e0107904810e7936d SHA-256: 09bde1c718e526b49824894dffb6409a64f0b1fb0d8e3f117e94cfee009cdd21
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting it's used for exploitation. This technique is commonly used to achieve arbitrary code execution on the victim's machine.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lhd.MpaY 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
b9d96cf0cb02b171f58c85f5d3c046e578adc308696f3ce655ad82fab8d67a4c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lhd.MpaY 885760 bytes
ooxml_oleobject_00_ole10native_00.bin
f8694fc8f5ade3ef6763be68012954a2ddf04a86e6fd194b42113f3d5ab06579		 ole-package OOXML xl/embeddings/lhd.MpaY Ole10Native stream: ole10nAtIVE 876331 bytes

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