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

Static analysis result for SHA-256 f97b4c1a380242c5…

MALICIOUS

Office (OOXML) / .XLSX

672.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-17
MD5: 5146f60c44f767730037618fc96a4587 SHA-1: e6812cb8cf3b1a9a8ac5cf66e36ef3b0938ca1c2 SHA-256: f97b4c1a380242c5efa234bd8ae966805071ff7dcf10ac44e69cdc9dd1a7eb1b
100 Risk Score

Malware Insights

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

The file is an OOXML document 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 header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/e7.oeN4KmE 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
7a3f22334c735ecdc903dce51ea99df85467a3d40f750f3136231f3d4e878d95		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/e7.oeN4KmE 959488 bytes
ooxml_oleobject_00_ole10native_00.bin
00eb0e464d563722dd5923d677dc30b5a4f44388297b387cf03bf753d8733729		 ole-package OOXML xl/embeddings/e7.oeN4KmE Ole10Native stream: OLe10natIVE 949275 bytes

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