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

Static analysis result for SHA-256 b4c1462f1ba2ce03…

MALICIOUS

Office (OOXML) / .XLSX

627.5 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-05
MD5: 9bb63c2a598c4b7f9f8e6b828aaa7911 SHA-1: e4a311a73b475f064a0bc3ed8fc95c4c7c920a2b SHA-256: b4c1462f1ba2ce03b6e895eb370baac709ed0c7e7bde0188c28b195277a7ea06
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file contains 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 size and entropy, strongly suggesting it's used to exploit a vulnerability. The presence of this object points to an attack pattern leveraging the Equation Editor for payload delivery.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6YrsEOphp.BL 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
0fdcdf149d8174504dc0a13bb1ab5d3403b351ce17a1e0d12871fa98ab92e855		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6YrsEOphp.BL 863744 bytes
ooxml_oleobject_00_ole10native_00.bin
b68ef558fef879119fa9470c4323906b6eb58bf59b2129ef20a9ddf4f0865e0f		 ole-package OOXML xl/embeddings/6YrsEOphp.BL Ole10Native stream: ole10NativE 854283 bytes

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