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

Static analysis result for SHA-256 107a0ff61bd5f6dd…

MALICIOUS

Office (OOXML) / .XLSX

676.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 3cda3c183439f4b26dd8c791a5e6613e SHA-1: 4f97e014d8f7869189e725b4faf33acca60e1ed7 SHA-256: 107a0ff61bd5f6ddff30df4613cdfce1bd54ea1c6c685610f8aa1cd99eb45c0b
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (XLSX) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's used to exploit a known vulnerability. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Yl.Ff6BV 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
78dc0b779ceea2f6e77353912260b22894cac2f01a00701a0026820be9687fbd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Yl.Ff6BV 996864 bytes
ooxml_oleobject_00_ole10native_00.bin
ec5a32e058cff45974f9961ccfca987f221426fc6d8c2f1d923e5561af68e608		 ole-package OOXML xl/embeddings/Yl.Ff6BV Ole10Native stream: ole10NaTIVE 986603 bytes

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