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

Static analysis result for SHA-256 b01a8a2ca3831ecb…

MALICIOUS

Office (OOXML) / .XLSX

613.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-14
MD5: 570104a6f9f9f137f422927b10dd8d74 SHA-1: 0f82d3747e32e1e6b2b9ddeded2449bf6afc5226 SHA-256: b01a8a2ca3831ecb3566d8d4a59fb5bab02c274f27021ec8491086e9519b4e85
100 Risk Score

Malware Insights

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

The file is an Excel 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 size than the actual stream, 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/Md.sdL97U 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
cf25621f61a21c99be66583840cde304492b3ba46bac8e9ae773605cce7b4443		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Md.sdL97U 826880 bytes
ooxml_oleobject_00_ole10native_00.bin
49b95efa041d2c23f0546f1b76e6d2035cb30999c143ac6550f50c2c43642b34		 ole-package OOXML xl/embeddings/Md.sdL97U Ole10Native stream: ole10nativE 817680 bytes

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