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

Static analysis result for SHA-256 e093c77daab34d72…

MALICIOUS

Office (OOXML) / .XLSX

656.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-13
MD5: 5d9238b5ba1fe86e590dc21586ec4909 SHA-1: 946604b7a5365d6f4de98780b6b0445c2ce76190 SHA-256: e093c77daab34d72d24fbdc226389efe6f232755ac8d63256b27b428df20db38
100 Risk Score

Malware Insights

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

The sample is an OOXML 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 designed to exploit a vulnerability. This is a common delivery mechanism for malware, often used in targeted attacks.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/V6ScPJE.Plrs 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
47fe56b2459017dabbdf00d4de02beb67237e8fdb3de60f5ab50900f764c17fc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/V6ScPJE.Plrs 976384 bytes
ooxml_oleobject_00_ole10native_00.bin
c122354bb136ce9016020c675c2da3ab5a44dd630080b398ab0a0cec622d63cc		 ole-package OOXML xl/embeddings/V6ScPJE.Plrs Ole10Native stream: ole10NaTivE 966563 bytes

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