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

Static analysis result for SHA-256 b1b34f641190c19d…

MALICIOUS

Office (OOXML) / .XLSX

1.99 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2025-07-04
MD5: f4394b33c9d8cbd71ecc30c4ac2eb888 SHA-1: 6688db2d81ea79ab36bc78885d41f89ab512730a SHA-256: b1b34f641190c19d7ec72df97d5be5542f002409e0864c05a02ac5f5e43f1e11
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like stream with an anomalous header, strongly indicating exploitation of the Equation Editor vulnerability (CVE-2017-11882) to execute arbitrary code. The exact nature of the second-stage payload could not be determined from the provided evidence.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7lXYALt.HGVeG 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
27add35e7a6c78780dd4a77521d7e07c144502e37917300b3e11f5c8cc15629c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7lXYALt.HGVeG 2823680 bytes
ooxml_oleobject_00_ole10native_00.bin
4023a1df8e81191f84935070fbe21c95eff62a82b29d77b9a45bf93e7bb34954		 ole-package OOXML xl/embeddings/7lXYALt.HGVeG Ole10Native stream: OLe10naTiVe 2798935 bytes

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