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

Static analysis result for SHA-256 7f676793d8d7c964…

MALICIOUS

Office (OOXML) / .XLSX

730.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-17
MD5: 156a8325da6a12b655e2c56c0ac7f7e5 SHA-1: 844d20d5d99b3aa8623fe30980047ca7efbccbcb SHA-256: 7f676793d8d7c9646d434f5ad2d97790a0beb2c8c4adf19b5a7f1c75edd8f983
100 Risk Score

Malware Insights

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

The file is an OOXML 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, strongly suggesting exploitation of a vulnerability within the Equation Editor. This is a common delivery mechanism for malicious payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/GYQWFPYC.60RwZxs 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
b404a0987cfede03e38541a21bee09d89cd9b5ec60823d9c597d5c1f1247ff90		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GYQWFPYC.60RwZxs 1020416 bytes
ooxml_oleobject_00_ole10native_00.bin
477263d10e9bba12d0c9e6183f13d560182ada8bb5df454c1d0ceee3981e7980		 ole-package OOXML xl/embeddings/GYQWFPYC.60RwZxs Ole10Native stream: OLE10nAtiVe 1009936 bytes

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