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

Static analysis result for SHA-256 72006dfd34f5b043…

MALICIOUS

Office (OOXML) / .XLSX

608.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-22
MD5: d0a479f856722693d79a76b27588e32a SHA-1: fe59316799f6e3e35a91ee2d86ae72360e8da856 SHA-256: 72006dfd34f5b043e6763b16ff8399382e69ad356e8c6b9e71ec908674dab55c
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this 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 initiated via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jtI.Jemxw 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
90409c9917934c3f19a6390946ab039f9ac9e9df7f143c027ad22dbece82540a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jtI.Jemxw 834048 bytes
ooxml_oleobject_00_ole10native_00.bin
317f119b6da2722e459dd3fbd08e74d28443b6677f4da4090a7ccac3943014b9		 ole-package OOXML xl/embeddings/jtI.Jemxw Ole10Native stream: olE10natiVe 825032 bytes

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