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

Static analysis result for SHA-256 ab53b7bd41044047…

MALICIOUS

Office (OOXML) / .XLSX

735.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-02
MD5: 7465320e3d5deb1504e47424bf977641 SHA-1: 0e21d89b0ba49e96af0f584627a3fafd85e978d0 SHA-256: ab53b7bd410440470fbd8bac3f28656eb0df760bdaa7c61cacb6e20b476c69fb
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size, strongly suggesting it's being used to exploit a vulnerability. The document body contains what appears to be a fabricated invoice or order, likely serving as a lure to trick the user into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1bBbL.dNq 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
de3b9a24e45af6d0c2fa9405af691211de59098a9a30c39cbc6ecddbd9bea6af		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1bBbL.dNq 1004544 bytes
ooxml_oleobject_00_ole10native_00.bin
6353922f53f6f6259fc5b4d464fbdd0336b31251cf3f4930b1e01ecc10be2fae		 ole-package OOXML xl/embeddings/1bBbL.dNq Ole10Native stream: olE10naTIVE 993835 bytes

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