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

Static analysis result for SHA-256 3e226f2deb6c162e…

MALICIOUS

Office (OOXML) / .XLSX

599.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-14
MD5: 89182afc3dd737547eeac188b53f12b0 SHA-1: ac6996ee02435e00a02f8b1aa5f73d2be5c985ed SHA-256: 3e226f2deb6c162ef126f6b3fec10fe29c0a40eb6f096d4336ca5cdc15204045
100 Risk Score

Malware Insights

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

The sample is an Office document containing 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 size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded OLE object is the primary mechanism for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/71vxeU.I8b 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
8a8e80d011acbac2c21d00938805932db3be43674ae72699535e7c18e03cd688		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/71vxeU.I8b 831488 bytes
ooxml_oleobject_00_ole10native_00.bin
9fdba4ea6b283d3d7e661501d02471d4acbe4f2383da66698d42ecaa7a586cd2		 ole-package OOXML xl/embeddings/71vxeU.I8b Ole10Native stream: ole10NAtIvE 822760 bytes

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