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

Static analysis result for SHA-256 29af0f3ac7cba3ad…

MALICIOUS

Office (OOXML) / .XLSX

608.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 965d35d6b68d1575a034908b2f17c415 SHA-1: faec833733ab74ff570c7221ea7903bafefda77e SHA-256: 29af0f3ac7cba3adba455604931a7374c8a0da2789ebf747dc8476711712d6af
100 Risk Score

Malware Insights

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

The sample is an Excel file 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. This is a common technique for delivering malicious payloads via weaponized Office documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Gh.cWVi 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
d3a64d8bf73319f96c66a935797bff04401f08c2dc5b4001d5bf19283e9c56f4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Gh.cWVi 876544 bytes
ooxml_oleobject_00_ole10native_00.bin
96c6280c162ce4608c77877867655b40a06697bfea8eb07d10e382660d2e3a6c		 ole-package OOXML xl/embeddings/Gh.cWVi Ole10Native stream: olE10nAtivE 867320 bytes

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