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

Static analysis result for SHA-256 97a2bf0fd22138e1…

MALICIOUS

Office (OOXML) / .XLSX

712.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 103fe0855ad51e463c22105fa370e4fe SHA-1: 1638838c90ac5580cc1934d4be03070709eff54e SHA-256: 97a2bf0fd22138e167c687ae72decada73b49506d0a9b821292a179d0feead34
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload within its Ole10Native stream, suggesting it's designed to exploit a vulnerability. This points to a likely attack pattern involving the exploitation of the Equation Editor component to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8WDIYT25.dh 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
79322f9d50d39efb4eee7996fe2d772a27aa93e6bcd698a2962218a4f31c7106		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8WDIYT25.dh 1034240 bytes
ooxml_oleobject_00_ole10native_00.bin
16bdfafd17b064a8cd2570326245a08dde0a6846f527b3059119355f06cc3f00		 ole-package OOXML xl/embeddings/8WDIYT25.dh Ole10Native stream: oLe10NatiVE 1023868 bytes

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