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

Static analysis result for SHA-256 35c686cb71a96289…

MALICIOUS

Office (OOXML) / .XLSX

696.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-07
MD5: 490088dcd48c9a5f86a1b9bd521ae7cf SHA-1: a34d7988502af2adec27490e6daf7fe311510b23 SHA-256: 35c686cb71a962894c9268f4bf6e0b6071876e0378af02b40779a46ef340a583
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. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability. The large declared inner size compared to the stream size further supports this, pointing towards a potential buffer overflow or similar exploit. The document body itself appears to be a business-related invoice or order form, which is likely 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/Mpl7zLKPX.H6 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
30dd0df69e926e4cc3f81742341cc68f8a6b03be6b2eb4a0c3c9f5036e84df10		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Mpl7zLKPX.H6 956416 bytes
ooxml_oleobject_00_ole10native_00.bin
698e7421e4ccb6791a62e33ae9e80e880be10ece01821f1db316f106aaec9580		 ole-package OOXML xl/embeddings/Mpl7zLKPX.H6 Ole10Native stream: ole10nATIvE 946564 bytes

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