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

Static analysis result for SHA-256 571e3b577cedb1f8…

MALICIOUS

Office (OOXML) / .XLSX

636.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-22
MD5: 35da765398819d6be73a7149174e10cf SHA-1: 4b1290d5dc17a6220e6a54c9a9251511dd1edf4f SHA-256: 571e3b577cedb1f85236953869efdbb980c5f8b6be26aceb9edf70ac62908c03
100 Risk Score

Malware Insights

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

The file is an OOXML document 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 header, suggesting exploitation of a vulnerability. The document body presents a fake invoice, likely a lure to trick users into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ECHItop.2I 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
37afa3483f2c8fd2decf1490687364b9bfa726bc8a0a2735298bff6c9ff1428f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ECHItop.2I 870400 bytes
ooxml_oleobject_00_ole10native_00.bin
0e0722b30e955ff8d5bde93bb847dbdd3cffff2147d4ad0e6674e30f46481137		 ole-package OOXML xl/embeddings/ECHItop.2I Ole10Native stream: oLe10NaTiVe 860892 bytes

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