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

Static analysis result for SHA-256 a75f0a0f3efc72d0…

MALICIOUS

Office (OOXML) / .XLSX

698.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-22
MD5: 9d59afc8e5a00a600efdfd5145bf9fcc SHA-1: 0150f7115db226eccdf1ce4ba06e50f56c4edd4d SHA-256: a75f0a0f3efc72d0cdbd3ebbf4243a8f181e7c7eee5f28c5636b1cc8d825fdaf
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a vulnerability. This is a common technique for delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/UM3lB.Hpu 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
62bec416d5bbb6d65b2f013876dbce55471452363a8c108f2b0093ced14e9631		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/UM3lB.Hpu 1007616 bytes
ooxml_oleobject_00_ole10native_00.bin
9c71f9a419a62875d05aeabe98fc63ed03f7317662b6a7ac544c2a5d4b4c57b4		 ole-package OOXML xl/embeddings/UM3lB.Hpu Ole10Native stream: OLE10NAtIVE 997257 bytes

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