Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7a2814076b09f7e2…

MALICIOUS

Office (OOXML)

621.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5a8855f01e7f973fc60b82a76089283d SHA-1: b845fe04d222a1f8396852e9c94fabe0d7271ede SHA-256: 7a2814076b09f7e2626e6b96f3f2737784a23e0176ad96b3187ad6ad41a19658
108 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. The high-severity heuristics indicate that this object carries a payload-like stream with an anomalous size, strongly suggesting it's designed to execute arbitrary code. The presence of a hidden sheet further supports the concealment of malicious components.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1ew.Vrb 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
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
08b79dd4b415a3b614002cc8e938854f074eb8b125034313a22f641d4ce4eb2d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1ew.Vrb 930816 bytes
ooxml_oleobject_00_ole10native_00.bin
8f6b95476fcfac5f44a120cb276f3b0ea5979041464a32ce697bc7e3762728d9		 ole-package OOXML xl/embeddings/1ew.Vrb Ole10Native stream: OLe10NatIVE 921058 bytes

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