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

Static analysis result for SHA-256 280b948371045e71…

MALICIOUS

Office (OOXML) / .XLSX

625.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-12
MD5: 48c6116acb69864092b058b1787a5d46 SHA-1: fe1de1401cb8613bad55e9f9111e5ae8a4271d37 SHA-256: 280b948371045e715108a5a0fa0c8fd5ef23ef916242da0bbce8188fa1884f51
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream, indicating it's designed to exploit the Equation Editor vulnerability to execute arbitrary code. The large declared inner size compared to the stream size suggests potential obfuscation or a packed payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/DZ.ok1 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
21e7a1941cf71f9c958018acd01d28ad117d562b8c4c506f5333f8e1c1599fd7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/DZ.ok1 911360 bytes
ooxml_oleobject_00_ole10native_00.bin
2419c65ccf5c9338dabdcaddb9a69ceba4314de72ccbb64d477391a9bf7aebe2		 ole-package OOXML xl/embeddings/DZ.ok1 Ole10Native stream: ole10naTIVe 901737 bytes

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