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

Static analysis result for SHA-256 e28ce3b2b6964eda…

MALICIOUS

Office (OOXML) / .XLSX

662.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-14
MD5: 18ff1bb38720aac51340f8ab12fa5787 SHA-1: 2f43096ab2d5297c0562945c78099608302a0277 SHA-256: e28ce3b2b6964edaa8549eb7be5682ee25a3d7d94ea8aee1982478992e09d1a0
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's being used to exploit a vulnerability. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/LTbQHw.z6DuSsW 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
43ec27dc4a8ac697c5119803cfcafaec5ce80be046b36101d2b21e10b48e8b7c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/LTbQHw.z6DuSsW 937984 bytes
ooxml_oleobject_00_ole10native_00.bin
b6c7577bfceb42866de538c54d6af667074a65df8f83bc763836285fa6026129		 ole-package OOXML xl/embeddings/LTbQHw.z6DuSsW Ole10Native stream: olE10NatIVE 928026 bytes

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