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

Static analysis result for SHA-256 0e069d1c1b135d8a…

MALICIOUS

Office (OOXML) / .XLSX

693.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-22
MD5: c35a31ffac0fdaad53c76ee67b5d943d SHA-1: 559f8cb19c576a3ca103bd073030405c551a2b96 SHA-256: 0e069d1c1b135d8a521b2a425e2ae19072da592cf6919e913cb107c666eeb71b
100 Risk Score

Malware Insights

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

The XLSX 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's designed to exploit a vulnerability. This points to a malicious document likely intended to deliver a second-stage payload via the Equation Editor vulnerability.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ghx1G.Kr 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
131bfacbe45b5c9dc96b9de416307b0f6117c08f9617d2d547ac6620a859fffe		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ghx1G.Kr 1010688 bytes
ooxml_oleobject_00_ole10native_00.bin
c9956fc142a28755153fc4921df1ce386155423af2b407dca66a43642a202e78		 ole-package OOXML xl/embeddings/ghx1G.Kr Ole10Native stream: Ole10NATive 1000225 bytes

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