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

Static analysis result for SHA-256 1dd400f8cb977133…

MALICIOUS

Office (OOXML) / .XLSX

586.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-21
MD5: bee21707ff9be00f7e20af4999e26992 SHA-1: d0f9811b71df0eef15592dc012fe2307604d67b6 SHA-256: 1dd400f8cb97713364a1fab17df90ede19c458f33a5d9c8aea47fa3a7b0268d4
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1204.002 Malicious File

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits anomalies in its Ole10Native stream, indicating it likely carries a malicious payload. The presence of an Equation Editor exploit is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zVrousd5W.O7e8xPA 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
778d2747c054d5b439ca838d102b8ac4467338b7277f75b4be920afcf6c9db62		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zVrousd5W.O7e8xPA 803840 bytes
ooxml_oleobject_00_ole10native_00.bin
56826d64cc271e373ab33e9cd86f3594dd7558542ae86be98552c911707c996a		 ole-package OOXML xl/embeddings/zVrousd5W.O7e8xPA Ole10Native stream: ole10nATIvE 794800 bytes

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