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

Static analysis result for SHA-256 077b0664b4ff96f0…

MALICIOUS

Office (OOXML) / .XLSX

687.7 KB Created: 2023-09-19 06:25:18 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-10
MD5: 11d8f332378983b3456dfcfe4d0557dd SHA-1: 79050cc6af5ef03b9f19993488f5206ec11dbb4b SHA-256: 077b0664b4ff96f0716318d939972fc17d7d84cabc8b854e60b0b04b9bd154fe
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet 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 within its Ole10Native stream, suggesting it's designed to exploit a vulnerability like CVE-2017-11882. This exploit likely leads to the execution of a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/0ndk.OMFfvUt 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
357d4ee5def05529bb9ae18b6eb6a5508c73b81f29a213444feef381910378e6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/0ndk.OMFfvUt 1031680 bytes
ooxml_oleobject_00_ole10native_00.bin
281a5647e8d04d57ea75013fe380193b34611d342378148e2b31d788c6f9639e		 ole-package OOXML xl/embeddings/0ndk.OMFfvUt Ole10Native stream: oLE10NAtIVe 1021391 bytes

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