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

Static analysis result for SHA-256 c156887e3bb91b76…

MALICIOUS

Office (OOXML) / .XLSX

701.2 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-22
MD5: 4bf9fc26cda390ed5ed423335546ffd6 SHA-1: b70464fbe7acd5333e2ebc17c3aee66e71faeea3 SHA-256: c156887e3bb91b76cb57d6ade2218edc7b708c798930dbe4d26ccd1383b2148f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file contains 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, suggesting it is designed to exploit a vulnerability for client execution. The presence of this anomalous structure strongly points towards an exploit delivery mechanism.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NxY.qmkc5 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
b50937dc9d89d4325601e28ba2dac100785b42de05e3f5fadd55b153ac4c9f2e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NxY.qmkc5 1050112 bytes
ooxml_oleobject_00_ole10native_00.bin
7e15da5f8b7cf121c17ef20490821928be0d246592b65d7bf6f24a86ef667b1f		 ole-package OOXML xl/embeddings/NxY.qmkc5 Ole10Native stream: oLE10NATIVe 1038889 bytes

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