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

Static analysis result for SHA-256 8d928a270063533d…

MALICIOUS

Office (OOXML) / .XLSX

666.5 KB Created: 2023-10-23 00:15:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-23
MD5: 4691ba2e89e7ea5d42b7d4c1f6033294 SHA-1: 95f5a6cfb62618fb2c051efda15f647f559672ea SHA-256: 8d928a270063533dbc270c11408e0224ec8897632dbb372e6eaa22b41de15866
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size. This strongly suggests the exploitation of a known vulnerability within the Equation Editor to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1vI2.wYgoVB0 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
62090d268e571895e073376fc5fdaf071263a01d968d6615646d718972e20787		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1vI2.wYgoVB0 978944 bytes
ooxml_oleobject_00_ole10native_00.bin
f678f077ae2d069f9c3a82cba1ffa8b7f1474b7c3f5e49c45e6dcec2ffadb181		 ole-package OOXML xl/embeddings/1vI2.wYgoVB0 Ole10Native stream: OLe10nATivE 969115 bytes

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