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

Static analysis result for SHA-256 edff0c21aa1e9750…

MALICIOUS

Office (OOXML) / .XLSX

681.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-20
MD5: 74b2f7699f498477bf0e757add334de9 SHA-1: c95e27b2b7ab0074b6b2901d41fa33365cf5c2e8 SHA-256: edff0c21aa1e97501ebe009d4cc81f83c1bb6222a628be773a7ec0fa8e0dc711
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet 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 it's being used to exploit a vulnerability. This is a common delivery mechanism for malware that leverages known exploits in applications like Equation Editor.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/37Pk3M.5vL 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
e9a6ec5d696d988c243c06146fe1d29f87552a5079a00afad623b25fe5065eb0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/37Pk3M.5vL 991232 bytes
ooxml_oleobject_00_ole10native_00.bin
5c231669ecd84e940597a0f2abee96e47f96ef3dc917c2e5b5e5b47c146599f4		 ole-package OOXML xl/embeddings/37Pk3M.5vL Ole10Native stream: OLe10nATivE 980775 bytes

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