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

Static analysis result for SHA-256 244104fcda8c3dac…

MALICIOUS

Office (OOXML) / .XLSX

743.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-09
MD5: b4204e537d8529bae3a4476fd6ef1f96 SHA-1: 8206faf6c1ebaf5591ea82ac4043bf52bcb21cef SHA-256: 244104fcda8c3dac0341567155320c8bf68f04a7c251506b572f35d38c180388
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, strongly indicating the exploitation of a vulnerability within the Equation Editor component to deliver a malicious payload. The presence of this object suggests an attack pattern focused on exploiting this known vulnerability.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/MTN.il 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
383f30cf0ec5eed9334909033ecd44451b4d300365de76756d7760eaac4c12f7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MTN.il 1044480 bytes
ooxml_oleobject_00_ole10native_00.bin
c11e271c8280aab0e9d4325bf5c7909d237c5323ab8ca2607eda37eee9f35d19		 ole-package OOXML xl/embeddings/MTN.il Ole10Native stream: OLe10NativE 1034228 bytes

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