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

Static analysis result for SHA-256 b13d796797816cf7…

MALICIOUS

Office (OOXML) / .XLSX

594.3 KB Created: 2023-09-06 21:32:55 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-07
MD5: 504dbd0f87196fdd0bfad07be39b3aa1 SHA-1: d0506d921d5712fcc7cac3cb1f5ecdc9425adfef SHA-256: b13d796797816cf7263e721d0b4545e3bc4596d1556817aa4b02bd0db5f544b8
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's likely an exploit for a vulnerability within the Equation Editor. The presence of this exploit suggests the document is designed to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Kq3r4j.pa 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
d08ff9fbfe07259458ad64c20184a3d103c2a7b0a7e05cd461b84a34ee3811c2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Kq3r4j.pa 866304 bytes
ooxml_oleobject_00_ole10native_00.bin
0a43d69a955fb68a4ec3bfcb3ef2d7eeede79d984f770191cff2115d9640f25f		 ole-package OOXML xl/embeddings/Kq3r4j.pa Ole10Native stream: oLE10nAtivE 856938 bytes

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