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

Static analysis result for SHA-256 834f1427d1c4180d…

MALICIOUS

Office (OOXML) / .XLSX

664.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-11
MD5: a23179a83978cc8c891fba516925cef1 SHA-1: 29eec6052356c49ed6a8922123f542a5cd06b211 SHA-256: 834f1427d1c4180dfd95dd7c5cfdf1c275fcff9d3a35c3ae2319a9b32b17e7cf
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Office 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 header and a significantly larger declared size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded OLE object is the primary mechanism for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/c66nk8xVy.ykk 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
74d6fd31df2d902c78da5f5ae8fbec6f7fcf0b53d5b6a1482398378d22aa058c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/c66nk8xVy.ykk 946688 bytes
ooxml_oleobject_00_ole10native_00.bin
c269e2f8307ff4eb9c93d98ead5df8dbea6ff52bdacdea0a0b343a308b83dfbc		 ole-package OOXML xl/embeddings/c66nk8xVy.ykk Ole10Native stream: Ole10nAtIvE 936530 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.