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

Static analysis result for SHA-256 5ed80b72be6e5797…

MALICIOUS

Office (OOXML) / .XLSX

586.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-15
MD5: 63b0cbe204c5ae988871d0dc068dcf6d SHA-1: 12e4398deb65326edda837ad3f014995c04ebb60 SHA-256: 5ed80b72be6e57973078775a37dbc7a827c3bb7df24c798f3b389edf7fdabd16
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits anomalies in its Ole10Native stream, suggesting it carries a malicious payload. The presence of an embedded OLE object, particularly one exploiting Equation Editor, is a common delivery mechanism for malware, often initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WrZi8DCz8.mLqiEmT 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
1eb1292c16437ee429afcc4302715b3ae51965fe2aacdac305ab0730962833a1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WrZi8DCz8.mLqiEmT 826880 bytes
ooxml_oleobject_00_ole10native_00.bin
ee7e69d769cf977b42f84fe49d5f6ba0a1b21bdb314199193fff608a20d9256d		 ole-package OOXML xl/embeddings/WrZi8DCz8.mLqiEmT Ole10Native stream: Ole10NATiVe 817719 bytes

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