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

Static analysis result for SHA-256 c65c3ed807173312…

MALICIOUS

Office (OOXML) / .XLSX

664.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-05-21
MD5: a5db1b44d885848242f326f2f64f9330 SHA-1: 667533c3489cc2cee713105673c4e7ed88f1c1f0 SHA-256: c65c3ed807173312f2a662f6d42328b5f87822e7ffeb53206446e4f408b1bc7c
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. High-severity heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it's used to exploit a vulnerability. This technique is commonly used to download and execute further malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7EzfDR7.vLYmwfm 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
375ca6211b547712bfb7f99e97f6380ef16b4728fb9d545a2e147442207a2b78		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7EzfDR7.vLYmwfm 911872 bytes
ooxml_oleobject_00_ole10native_00.bin
9a18823deb26824b0b0abcbf18457e5f203d0d5bd7b23a0b64b4bb2e7c83b401		 ole-package OOXML xl/embeddings/7EzfDR7.vLYmwfm Ole10Native stream: Ole10naTiVE 902237 bytes

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