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

Static analysis result for SHA-256 08a0ab3c46df8c30…

MALICIOUS

Office (OOXML) / .XLSX

2.30 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 6a665d2ebffb301cd53b051cf04337b3 SHA-1: 74b35d94beacfe37f41cc6891e7ddc96a442c0bd SHA-256: 08a0ab3c46df8c30ed29ab0ab4d5cc733c421cbff42490788a34f5aba13bb37b
72 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This is a known vector for exploiting vulnerabilities like CVE-2017-11882, which allows for arbitrary code execution. The presence of a hidden sheet further suggests an attempt to conceal malicious activity. The primary attack pattern involves exploiting this embedded object to gain initial execution, likely leading to the download of a secondary payload.

Heuristics 5

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.day.com/dam/1.0
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/tiff/1.0/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
91a07d03338900a15aae775a3dc0f25bfba199edf521f1e93e866c99b0133067		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 1969664 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
ooxml_oleobject_01.bin
baf6a7be5f1261130d4a249274c22bcb41c102ab805e5eec692b2936f9d1c653		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Document1.docx 127545 bytes
emf_00.emf
7a831d7652d834f4578380356b1846cfd986f3f337544f8aa47a4afd16fbcb0e		 ooxml-emf OOXML EMF part: xl/media/image3.emf 653280 bytes

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