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

Static analysis result for SHA-256 6b5ffd475ed1287a…

MALICIOUS

Office (OOXML) / .XLSX

728.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-09
MD5: 1d5b13e8e1e6c90f96ccbd9642f254be SHA-1: 7cb249e588bc141980f035fb57ed42e6f8dad4b1 SHA-256: 6b5ffd475ed1287a9ce3eb7bb71a2f3c6bf680914166c36c2daaa9eb11f06f01
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a malicious Equation Editor object. This object carries a payload-like Ole10Native stream, indicating it's designed to exploit vulnerabilities within the Equation Editor component to execute malicious code. The high entropy of the stream further suggests it contains packed or encrypted data, likely a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vYkgDjL.d7UeFL 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
605325a357eeac71b04aa9ac1f050c558688f1086f55ae0eb337536b29090a9a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vYkgDjL.d7UeFL 1006592 bytes
ooxml_oleobject_00_ole10native_00.bin
41a71b5b9742213aebc81892799e4497f91c145202cbbe31c66d45ff444a2908		 ole-package OOXML xl/embeddings/vYkgDjL.d7UeFL Ole10Native stream: Ole10nAtIve 996043 bytes

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