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

Static analysis result for SHA-256 9718029bc8351010…

MALICIOUS

Office (OOXML) / .XLSX

620.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-07-31
MD5: 9da876df1c5b8812aae2bf9a175eb5b4 SHA-1: 1559e32fadae2f629846b632a89172a76fe5a616 SHA-256: 9718029bc8351010b4d01977d1b6440449921404d175b7bf268bdf46ee5fdcb2
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 an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it's being used to exploit a vulnerability. The embedded OLE object and its anomalous stream are the primary indicators of malicious intent, likely for delivering a secondary stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rbZi.R0ns 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
6ff0116752f5177200135e08e336c4b9d9ea3f674646f931e210e8f6bd6479c6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rbZi.R0ns 899584 bytes
ooxml_oleobject_00_ole10native_00.bin
22299d84f4efee4570afd46008cf514a1f65b7a85e9403a49f7a45aec01aeb72		 ole-package OOXML xl/embeddings/rbZi.R0ns Ole10Native stream: ole10natIvE 890215 bytes

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