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

Static analysis result for SHA-256 59322ec3c2be3af4…

MALICIOUS

Office (OOXML) / .XLSX

644.4 KB Created: 2024-06-12 09:57:11 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-06-13
MD5: 3b655708f54878e96550d7b0a454f68b SHA-1: 3d97aa039be147501fea1a91fbe31858080b579f SHA-256: 59322ec3c2be3af4fa9549c5465e2eda8ec05724fda7b97f670c589abefb4fad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size. This strongly suggests exploitation of a vulnerability within the Equation Editor component to execute arbitrary code, consistent with malware delivery.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vtrBofT.ZhhZVTr contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • ClamAV: Win.Malware.Agent-10031850-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Malware.Agent-10031850-0
  • 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
96ba0d453bf46f48d4f2b54e1e548c7293e808bd37733635b95e18c2ad63cf9a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vtrBofT.ZhhZVTr 872448 bytes
ooxml_oleobject_00_ole10native_00.bin
70124041d7d2878e3032a42b16a93907669b8c465842ff0a54f2b2aef96f6561		 ole-package OOXML xl/embeddings/vtrBofT.ZhhZVTr Ole10Native stream: oLE10NATIVe 863171 bytes

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