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

Static analysis result for SHA-256 1d546559c2c605bb…

MALICIOUS

Office (OOXML) / .XLSX

722.4 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: fe67e734f9fe03bb0652862acf76bb3a SHA-1: ddac555c87369fd6d813333b807c15719bc4ef3d SHA-256: 1d546559c2c605bb9bbb3d1ee89a0905a9e7ec84cc7ccce39b766f9408201b67
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 header and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This technique is commonly used to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6fYVU0DmC.M9qUbZU 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
bee09910cc6259ffe9355788986ddce04efc9486a4b60a6fedb4554bb9724f53		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6fYVU0DmC.M9qUbZU 1058816 bytes
ooxml_oleobject_00_ole10native_00.bin
9dfb47d0c85251688a43849f483299f56ed513d1ecfc36fa980c83ce62afcde1		 ole-package OOXML xl/embeddings/6fYVU0DmC.M9qUbZU Ole10Native stream: oLE10NATiVE 1047710 bytes

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