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

Static analysis result for SHA-256 6cbdfcadb60ed141…

MALICIOUS

Office (OOXML) / .XLSX

745.5 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-05-23
MD5: 15996f1576add65a62f13d09e5dd365d SHA-1: 5a6824710600382ec506bfdb96b374b00d17fe21 SHA-256: 6cbdfcadb60ed1419c39165c9ff37c00fdf4179d281892a35f58cb06d0d98434
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample 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 and size discrepancy, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) for client execution. The embedded object is likely designed to download and execute a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/qOr2qq.AV1bM 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
b72ee840df5df041c10ed7c915bb8b731ae29ca801df624bcacee14d2d99e21f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/qOr2qq.AV1bM 1027584 bytes
ooxml_oleobject_00_ole10native_00.bin
27d7384b1ab4cc7bf6a0b391d9fc562831bb8c7df913da0275ecccffb1672fb4		 ole-package OOXML xl/embeddings/qOr2qq.AV1bM Ole10Native stream: OLe10NaTIvE 1017109 bytes

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