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

Static analysis result for SHA-256 60c387a8f75dfb10…

MALICIOUS

Office (OOXML) / .XLSX

664.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-30
MD5: 2037e11d47f79f15b4ef74a797c4a20d SHA-1: d351284d7fa1069051278a1f9e916883c5bcedb2 SHA-256: 60c387a8f75dfb10184c9036649774420b122ef6953136a8229a6c8859ff97bd
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and header. This strongly suggests exploitation of a known vulnerability within the Equation Editor to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/2W.RvY 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
0ec8811360755b7abe80706dbf04501458e95f3695f9e8bab0428a914b6300a1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/2W.RvY 996352 bytes
ooxml_oleobject_00_ole10native_00.bin
f59c64045227cf004bc8f17bd6189794c8ae69748694cbf1059d8fc65b05d233		 ole-package OOXML xl/embeddings/2W.RvY Ole10Native stream: OLe10natIve 985757 bytes

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