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

Static analysis result for SHA-256 0552fee8b3190964…

MALICIOUS

Office (OOXML) / .XLSX

599.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-11
MD5: 8ac740cbe0f121153b4f1bfd6868ebd5 SHA-1: 73062759f8a947cce60b8fbf953581cc45af5dde SHA-256: 0552fee8b3190964dd1bb3a8331a7cfe675828b8a24e838ea7827bd652e3ed5d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Office Open XML spreadsheet 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 size difference, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to execute arbitrary code via a malicious attachment.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/KK.BEabFTo 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
4fb49224437dd912d8389ef34a8e5ab902b066634b725384115c94af1f6f3c11		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/KK.BEabFTo 899072 bytes
ooxml_oleobject_00_ole10native_00.bin
0d1eb736573fb83e45fcec87fe47ebf19555d665c37e285bfb420d8aabb1dcb0		 ole-package OOXML xl/embeddings/KK.BEabFTo Ole10Native stream: oLE10naTivE 889831 bytes

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