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

Static analysis result for SHA-256 21ecb947da227991…

MALICIOUS

Office (OOXML) / .XLSX

630.1 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-03
MD5: 0acfb6a7921a83da8199e1a8f8a8df0a SHA-1: b85602cf2a8bab909ed9a38b35c56f1e989b7ed4 SHA-256: 21ecb947da227991e6b37822febbce8f12cecd9295f4a484b4cfa01248cdd492
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6Ym.FkUkx 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
bc770455821faf92230019ab651d425a5089c15fbc0b217b30352d1a9e3f3388		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6Ym.FkUkx 909312 bytes
ooxml_oleobject_00_ole10native_00.bin
8bcfbc7ce63d9a1c402c0c771515fda14abe2f336b5b8de4ad7cb328a806d2e6		 ole-package OOXML xl/embeddings/6Ym.FkUkx Ole10Native stream: ole10nATIve 899785 bytes

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