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

Static analysis result for SHA-256 186d9848000eee53…

MALICIOUS

Office (OOXML) / .XLSX

681.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-07
MD5: cd5462b5fd310e95362a9a37ba227c49 SHA-1: 566dd93a2362c987b753ec8326240abd7ab44058 SHA-256: 186d9848000eee5393ff0a5ba028b48fc0e6b01997ca0cdf139b4a41e0360975
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This points to a malicious document intended to deliver a secondary exploit or payload upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Ijg3Tw36.H8 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
0ed4aa78f6ef3c0e09f5ce008977af3458a6e297d015ac96067e70d47e379322		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Ijg3Tw36.H8 991744 bytes
ooxml_oleobject_00_ole10native_00.bin
a21beaa4453de8dea1250af494f2786b1a5c70e5340442369dd852ec2a1d81fb		 ole-package OOXML xl/embeddings/Ijg3Tw36.H8 Ole10Native stream: olE10naTiVE 981168 bytes

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