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

Static analysis result for SHA-256 a9b7e85b793df78c…

MALICIOUS

Office (OOXML) / .XLSX

649.8 KB Created: 2023-08-29 00:00:01 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-30
MD5: 87dca63ef23560de65bef033677757a9 SHA-1: 2a1ad660cd900cf7709c0ea15f7620ec87f1f220 SHA-256: a9b7e85b793df78c02850ae50851dc00883cd4f5ca9df8deaad213607ae89381
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 Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting it's used to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6FbL.1sz7ybH 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
d58b3486dfbcffc770c89d235dd5aa0b2a0d1e4bf84ffb17a1556109795c7c10		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6FbL.1sz7ybH 925184 bytes
ooxml_oleobject_00_ole10native_00.bin
e308aad53ad88441ecc90107455e5901dadbee4b21f4bfeea3d7bf255b6c968f		 ole-package OOXML xl/embeddings/6FbL.1sz7ybH Ole10Native stream: OLe10NAtiVe 915198 bytes

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