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

Static analysis result for SHA-256 c9bf8db0c06b85ad…

MALICIOUS

Office (OOXML) / .XLSX

658.5 KB Created: 2023-08-09 10:16:04 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-22
MD5: 38a1ff8689fc29e42ab21e7dcede8d59 SHA-1: 2497699018eb4b57c10bd34b22224dae613e0741 SHA-256: c9bf8db0c06b85adbddae3e91d0942cb51418f2ef31ad0fa115360c6a194ce2b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file contains 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 known 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/LXeeEhrA.6e4Jx 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
5f13fdfc7da3bc7036117851401344cc7b03ec6d35ae9bef00a7ce2a9455c9a6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/LXeeEhrA.6e4Jx 937984 bytes
ooxml_oleobject_00_ole10native_00.bin
a55153d0843774bd5972c2e0378e6e45eb0e26ff3b9e18c3e683eabb511bb30f		 ole-package OOXML xl/embeddings/LXeeEhrA.6e4Jx Ole10Native stream: OlE10native 928069 bytes

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