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

Static analysis result for SHA-256 bd5a518819f64e9c…

MALICIOUS

Office (OOXML) / .XLSX

683.7 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 92b26ad569db7943ea06c2fcd2c123f0 SHA-1: bd0e14a662a72a8ee59d2f8bdacff6a259b622ee SHA-256: bd5a518819f64e9c2dd28fb1d6922071497fd20264cf29a45af7b60d04275253
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-sized Ole10Native stream, indicating it's likely used to exploit a known vulnerability like CVE-2017-11882. The 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/EB7pN6T.UEv5Aa 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
0c881093e7445fa96768dda6d18a8e7ac5dbc4cafad50d9097827935ba70edf1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/EB7pN6T.UEv5Aa 982528 bytes
ooxml_oleobject_00_ole10native_00.bin
ed097a7aec530abeedbe2c2e69fefbe833b9920b063fb99e921a26db560e7a80		 ole-package OOXML xl/embeddings/EB7pN6T.UEv5Aa Ole10Native stream: OLE10naTIvE 972330 bytes

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