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

Static analysis result for SHA-256 164a8d6c7b972425…

MALICIOUS

Office (OOXML) / .XLSX

722.0 KB Created: 2023-07-25 09:39:57 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-02
MD5: bbb1da69727ca4ee9a63454a203a5d45 SHA-1: 81c010ed162b84d5d2dc338d85e23fb0d7967310 SHA-256: 164a8d6c7b972425a5a07c0a406d31e028a7a101ae2ef2c2d22c62765b9d112b
108 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. This object carries a payload-like stream with an anomalous header, suggesting it's designed to exploit vulnerabilities or deliver a secondary payload. The document body contains invoice and payment-related text, indicating a lure to trick the user into interacting with the malicious content.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/RdAuZ8CQJ.R4edt 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
176c3b82c41d6c10f75b368ca9e4d70c10e6606a82cf743f4474fecf592118ef		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/RdAuZ8CQJ.R4edt 1016320 bytes
ooxml_oleobject_00_ole10native_00.bin
815e9f6c971bd7f15c13171c317275173e6791cd4ad207a90c56ef6f2f1d03f6		 ole-package OOXML xl/embeddings/RdAuZ8CQJ.R4edt Ole10Native stream: oLe10natIVe 1005940 bytes

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