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

Static analysis result for SHA-256 a4808da1cd73c2f0…

MALICIOUS

Office (OOXML) / .XLSX

1.97 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2022-11-02
MD5: 4bdde21d001747c5e608e9fe67e8bfbf SHA-1: fab692ffdab827b483f3e2c11247bd2debb376a1 SHA-256: a4808da1cd73c2f0e96a96800367b369c6b81704f27a39ca5a45bd8a73c45aa6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability for arbitrary code execution. The presence of this object strongly points to an exploit delivery mechanism.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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
b99c98f382aa4e48b79e377651e2dce610aa788c0467918132471617ff7eb52c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 2846720 bytes
ooxml_oleobject_00_ole10native_00.bin
7959eb3278824d867525276d8542a5b067cab93df846f3ae89ca9ad59e39daa1		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NATIVE 2822034 bytes

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