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

Static analysis result for SHA-256 0d027577105c4374…

MALICIOUS

Office (OOXML) / .XLSX

666.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-06-17
MD5: 600e6af65a8bdde64f336b8e941a91b6 SHA-1: 4ddc975dd69d0185a42641f3543b3b2a8e716b38 SHA-256: 0d027577105c4374ced1834794ad625a631f68381512cd95e339f345f80ff4dd
100 Risk Score

Malware Insights

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

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 size and entropy, strongly suggesting it's used for exploitation. This points to an attack pattern leveraging a known vulnerability in the Equation Editor to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/G0LXbw.COTx 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
f2f8380427c96aa4d5c9e4a930370c59d2820ff321d307e84679d806f1084d33		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/G0LXbw.COTx 967168 bytes
ooxml_oleobject_00_ole10native_00.bin
2507a157ca512ddc823d43d32f858a56d1aa3357184eac23b14075f3d8dbd61d		 ole-package OOXML xl/embeddings/G0LXbw.COTx Ole10Native stream: OlE10naTivE 957351 bytes

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