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

Static analysis result for SHA-256 7de08a9e1cc5d054…

MALICIOUS

Office (OOXML) / .XLSX

597.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-18
MD5: 7326aa3cd07946d9d3631382c6cd57b4 SHA-1: 8581cd3d5de0f63b678641beb94383006cb43f88 SHA-256: 7de08a9e1cc5d05431bc2da4bc26b1725c3730b28a6d2425c313a4eb762b4128
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 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, indicating potential shellcode or a dropper. The document body appears to be a fabricated invoice, likely a lure to entice the user to open the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fzlqHC8tv.RQFaXV 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
9169fd4eed8336918b853453ba64fffd659ffd892fbbdc2b27029bdc0eada6d4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fzlqHC8tv.RQFaXV 852480 bytes
ooxml_oleobject_00_ole10native_00.bin
6bbc24727daa09d7161b24f68195e501512ceda125a62b8b1047fbe4b51a3575		 ole-package OOXML xl/embeddings/fzlqHC8tv.RQFaXV Ole10Native stream: OLE10NativE 843718 bytes

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