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

Static analysis result for SHA-256 b053d32b3179667b…

MALICIOUS

Office (OOXML) / .XLSX

691.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-07-02
MD5: 2f9a02c106854721a8c4fbdef77e6bd1 SHA-1: 626be0171e875f0be6a67e72c92e2c0bd190d51c SHA-256: b053d32b3179667b0f2ecfbd8ef2ba4ea80e0ed27106847282b72a3778ada68f
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-like Ole10Native stream, suggesting it's designed to exploit a vulnerability. The presence of this embedded malicious object points towards a delivery mechanism for a secondary exploit or payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vx.QmuSce 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
fa8760a20da04a2b4683e140c25705807ec05f7822a110c4f5cf156d8313e604		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vx.QmuSce 979968 bytes
ooxml_oleobject_00_ole10native_00.bin
b9618630f0ec2b2721b35d39c1597a3ea7a485fa186e21b14fa0fd2ce0d55609		 ole-package OOXML xl/embeddings/vx.QmuSce Ole10Native stream: Ole10NAtIvE 969905 bytes

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