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

Static analysis result for SHA-256 5bd1e6ca2d78ee9a…

MALICIOUS

Office (OOXML) / .XLSX

1.19 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: ec90f83547b3d989f3c1787eb53820c8 SHA-1: abdeca0e5268ab7ad0826936c926665655940d14 SHA-256: 5bd1e6ca2d78ee9a8bd791eac224825e8cd094cc90e357646657d1a07758a3ec
110 Risk Score

Malware Insights

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

The sample is an Office Open XML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting an exploit. This technique is commonly used to achieve arbitrary code execution via vulnerabilities like CVE-2017-11882.

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.
  • 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
  • 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
cc5581532114cd81ba9eba190c45006023952051d2640387ca79308a49e4eda6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 10240 bytes
ooxml_oleobject_00_ole10native_00.bin
59fb77315591a55324873430963abffa12244adc4996302250a87d8a758a5796		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 8667 bytes
ooxml_oleobject_01.bin
a923a11aa585fc40c9a1f6eb7214fdee2ef16979a2214b092ef6160f42d7237c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 854016 bytes
ooxml_oleobject_01_ole10native_00.bin
d089df8e96de1a650f37d0e3a2b8e67a60f7ccae7bbdb11bb5d340efe1852c94		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NAtIve 844384 bytes
ooxml_oleobject_02.bin
26f7cd554adece871469e25ab1e206af4f2fd4283b3a1fe87ac435009d62c366		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 122509 bytes
emf_00.emf
6b68e475aa77ce14fe5021eca26c4f003cd48830c920a5a23ea62642f87a85b0		 ooxml-emf OOXML EMF part: xl/media/image10.emf 648132 bytes
emf_01.emf
a48d6bf67e2818b32f191e342bb5d41def542af7ce655756b8032f95f980f9db		 ooxml-emf OOXML EMF part: xl/media/image11.emf 7608 bytes

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