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

Static analysis result for SHA-256 6d8c37a0e68b1a80…

MALICIOUS

Office (OOXML) / .XLSX

2.39 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: d60cae8c17c94837610c946ee54b764c SHA-1: 885f5630332d095075b0c3537588fb610b6ca416 SHA-256: 6d8c37a0e68b1a80985b0f4488dc93a3e41fd0ae2985c70b25a5bc11e8209872
152 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains a high-confidence indicator for CVE-2018-0798, related to an anomalous Equation Editor OLE object. This indicates the file is designed to exploit a vulnerability in the Equation Editor component to achieve code execution. The presence of embedded OLE objects and anomalous native streams strongly suggests a malicious intent to deliver a payload.

Heuristics 7

  • 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.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
  • 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
c394e3c7f9a887c16bb2a4d2366b407a9c6fc1941d0ab1543ceb2a93a8d25282		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 1759744 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin
5f2ede74ed1ba861cd12ce7ff2b71dcf6ce6897ea4830f713423189e762845f4		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10nAtIVe 1743485 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
ooxml_oleobject_01.bin
250a8e255c9a13dd45ecee78bbd7ff1493b7424ac0c3b9bed6dbf74af021f279		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 20480 bytes
ooxml_oleobject_01_ole10native_00.bin
08cc93f25b3119777a19afcd70691423f20e1f0d413b58f81da03d4f2d582479		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 17673 bytes
ooxml_oleobject_02.bin
65ced839c4ccfecfe84ba0931bbd93fe2b4eeddab920d8d235572d6277d9db48		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 127546 bytes
emf_00.emf
fc18270227718b980c8cfa51cb669a90ba1e93ee0d9704268ad41c3e64763aa9		 ooxml-emf OOXML EMF part: xl/media/image9.emf 653280 bytes
emf_01.emf
dd3177c1e0d6b81f0498573e9affe87c8d7901d7537fad22966698b3c0880a00		 ooxml-emf OOXML EMF part: xl/media/image8.emf 5316 bytes

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