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

Static analysis result for SHA-256 da014bf8e3be3995…

MALICIOUS

Office (OOXML) / .XLSX

725.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-08
MD5: d82abc18f79eaf54c56314a0fa0c17cc SHA-1: 12a0be8e3b26dc253940db1362d009b3a2eb7771 SHA-256: da014bf8e3be3995c78cfb884e97dbcd799f8d1434058e4312d9c095f88f6f06
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object with a high-risk anomaly indicating a payload within the Ole10Native stream. This strongly suggests the exploitation of a vulnerability within the Equation Editor component to execute arbitrary code. The document body, formatted as a purchase order, serves as a social engineering lure to encourage users to open and interact with the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/h358CEf.SOk 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
8dd837ac734766bec3a007ba22dbf0e84abdc76206d3b92a4d3180209dd3f323		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/h358CEf.SOk 1003520 bytes
ooxml_oleobject_00_ole10native_00.bin
69589cb769cfa5ac61c2cc1fa4d525f2d30ea5701415ed64b5573188f31ec72c		 ole-package OOXML xl/embeddings/h358CEf.SOk Ole10Native stream: ole10nAtiVe 993118 bytes

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