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

Static analysis result for SHA-256 3a4051acd60bed71…

MALICIOUS

Office (OOXML) / .XLSX

675.4 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-06
MD5: e3c933b16dad65479d6d8cd4abd0132c SHA-1: feb1e08ae51d3e1b52d357c65e4dd00fe9814655 SHA-256: 3a4051acd60bed71f2dc8e08c5ee07c9803a41338b3c278f06845be4c8768778
100 Risk Score

Malware Insights

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

The sample is an Excel file 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. This indicates the file is designed to exploit the Equation Editor vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/eC.4fU4 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
288cfb102f14be4597894d130570fee5a8ec5e34596d4c01cff41935a852a9a1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/eC.4fU4 926208 bytes
ooxml_oleobject_00_ole10native_00.bin
5a9e8b74ea3415557e207ac48de4e4de1d25b6c0cdbefda6baa560abbccc209b		 ole-package OOXML xl/embeddings/eC.4fU4 Ole10Native stream: ole10nATIVE 916109 bytes

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