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

Static analysis result for SHA-256 d9d8a460d96c2cd1…

MALICIOUS

Office (OOXML) / .XLSX

589.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-10
MD5: ef6a2a71b6a9920aa8d561f1864ff858 SHA-1: 55218087cd555fe1840e120b264b831e58778cbc SHA-256: d9d8a460d96c2cd1dd5d2aa7969ee68df376b2924c520a89cc0173dc52d45cb8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Excel 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 header, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/GKC7jw.J8 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
d49698505b2c1fe5a7ed51d9c15f7ba5d5688bc7f443e9cb3031d4b9ddccc588		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GKC7jw.J8 846848 bytes
ooxml_oleobject_00_ole10native_00.bin
07b882bac1bf6f542d08648a47cf5eab3399b0156ec75c22c1886141a4bcc97b		 ole-package OOXML xl/embeddings/GKC7jw.J8 Ole10Native stream: Ole10NATiVE 837665 bytes

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