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

Static analysis result for SHA-256 dcb50e45d0511d07…

MALICIOUS

Office (OOXML) / .XLSX

660.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-15
MD5: 3442c7d93651dc9641d4008b866e3718 SHA-1: 1d08608116e98f7a17f65d72de6d546522865712 SHA-256: dcb50e45d0511d07d2cdad850343c1230b368acbe6abc6115dc727a1e9ec3478
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, suggesting it is being used to exploit a vulnerability. This is a common delivery mechanism for malicious documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Jkya3Ej.AdTG7G 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
3398e607a18cecb4c3033bee20cf860390837e7cc7ccc18eba5837425bbeab15		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Jkya3Ej.AdTG7G 903168 bytes
ooxml_oleobject_00_ole10native_00.bin
a4005463c3f2889c23e1270ea098ef7ab423991bf0e65dc31488202699d797ec		 ole-package OOXML xl/embeddings/Jkya3Ej.AdTG7G Ole10Native stream: oLE10NaTIVE 893848 bytes

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