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

Static analysis result for SHA-256 ccc10d84dff9f45e…

MALICIOUS

Office (OOXML) / .XLSX

718.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-07
MD5: 725085cdfd5ec606bda6a37793653db0 SHA-1: 600abbf7f381549f35aa323edb17c4d5ffd4b8f1 SHA-256: ccc10d84dff9f45eaf7d748078f78b04c419af03ae60fb42036c050dc93ac349
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting it's used to exploit a vulnerability. This points to a malicious document designed to execute arbitrary code upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Pcn63I.GWIG 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
5696c88fe4342325c59cf4a6aa285bad7d60fc30a2b48da672ffc6a789f2af0d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Pcn63I.GWIG 1020416 bytes
ooxml_oleobject_00_ole10native_00.bin
29039a6280903335333cb55ff7fc49a6ec3adbd7a1d170a108d1cdbbfde8124d		 ole-package OOXML xl/embeddings/Pcn63I.GWIG Ole10Native stream: ole10naTIVE 1009806 bytes

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