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

Static analysis result for SHA-256 a0d10c0a3c606d70…

MALICIOUS

Office (OOXML) / .XLSX

686.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-06
MD5: c0c78c418e53db45f8c6e02e74fc8f56 SHA-1: 30cce125518e39ea450202fe985f205ae3f98ac2 SHA-256: a0d10c0a3c606d7056e3293eb61d491b01cdd6be9ef5ad84720e30365886aac8
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 an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability within the Equation Editor to deliver a secondary payload. The document body appears to be a commercial invoice, likely a lure.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/GksBqz.pWNDyWM 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
93d096ce0ebdfd9c26754c134920354a33e985d78dc5704034a17aef246ec615		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GksBqz.pWNDyWM 971776 bytes
ooxml_oleobject_00_ole10native_00.bin
a70304d2ab106ba9b37bf4dd520d37c53efcb79b410cfdeacfd02e97e9117998		 ole-package OOXML xl/embeddings/GksBqz.pWNDyWM Ole10Native stream: OLe10natIve 961907 bytes

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