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

Static analysis result for SHA-256 5ca56e8d735e5ef8…

MALICIOUS

Office (OOXML) / .XLSX

602.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-06-15
MD5: be569cec91ffdefc68685ee98a73445a SHA-1: 2ab48cabcb005e891bc77924c1b283d2ad43c573 SHA-256: 5ca56e8d735e5ef803fb049eb066f6ad83ac13ce6560e61a36d2c7220a992a05
100 Risk Score

Malware Insights

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

The XLSX file contains 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 known vulnerability like CVE-2017-11882. This technique is commonly used to deliver second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/RNOm.sm78S2 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
2213182e90e4b474ba7cb73b8104378ae1107bc2a55f5f6b0160264eaa99febf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/RNOm.sm78S2 889856 bytes
ooxml_oleobject_00_ole10native_00.bin
09e767046d0a451ad13413e87c307a401e3ec027b9c4141ce5a10950b5b02e5e		 ole-package OOXML xl/embeddings/RNOm.sm78S2 Ole10Native stream: ole10NatiVE 880249 bytes

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