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

Static analysis result for SHA-256 2b85f694593fd8a8…

MALICIOUS

Office (OOXML) / .XLSX

691.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: d29a1acefee1dfb9671ec5b5349d4497 SHA-1: 4c4277c29b3a130e95e6dfd13888f2787b83f9f1 SHA-256: 2b85f694593fd8a82772e657ad7de3c9440dd459d3c2a8574d3a2d8d97ea797b
60 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code. The embedded object is likely the initial stage of a multi-stage attack, aiming to download and execute a secondary payload.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/AJ.r1ynT contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
815f79789f9d429ecf4714077cd5042a23df39df49b1791332821d79942de2f0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/AJ.r1ynT 1021952 bytes
ooxml_oleobject_00_ole10native_00.bin
2683b8d0e7b10f2ac48d19e446ce45a2c40732ac96bf417dae5deb4a536d6a42		 ole-package OOXML xl/embeddings/AJ.r1ynT Ole10Native stream: OLE10NAtiVe 1011288 bytes

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