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

Static analysis result for SHA-256 988433d1492192d1…

MALICIOUS

Office (OOXML) / .XLSX

698.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-29
MD5: 001a82080a4520ef17fea34e62d4b89d SHA-1: 9c6bf76d6487af3b8b993aa757a0dfe72818d57f SHA-256: 988433d1492192d1ca35c0aad8f6705e0c63c792c358fc77d0edb15f6e44c0ab
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 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 inner size than the actual stream size. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code. No scripts were extracted, and the document body appears to be a legitimate-looking invoice, likely serving as a lure.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tpkmUQ5bo.wqvh 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
287da92c6c8f40cf7c71fadf4279fb782c550210308892b58a114b72af9e68e1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tpkmUQ5bo.wqvh 973312 bytes
ooxml_oleobject_00_ole10native_00.bin
b93a9af238aa817f5abf75df6e9b147683d0b9b7a9853e47fb87c8a8a5e8bf2e		 ole-package OOXML xl/embeddings/tpkmUQ5bo.wqvh Ole10Native stream: olE10naTiVE 963379 bytes

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