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

Static analysis result for SHA-256 98a7480d298e2c09…

MALICIOUS

Office (OOXML) / .XLSX

1.34 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 0d0f7726d07da016d15a916515663f85 SHA-1: 2e5ae9793ffca2d156a3a6a7a8905730aaa784fb SHA-256: 98a7480d298e2c092c07837dfaf320fa81fcd880197831071b0033432d857ac5
110 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a large declared inner size, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malicious payloads.

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
  • 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.

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
1027ffe3df8ff02a7de6fe56cfc35c866371d470f2658686ec42881e0988b814		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 1535488 bytes
ooxml_oleobject_00_ole10native_00.bin
f7bfcd2cfafe65360c900b06396fb593106749574e01161bc1df7461e65c0804		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 1520900 bytes
ooxml_oleobject_01.bin
6cbaac5bd7ebb38223a42504177d92868768db9562866b4a51657225dc27e3db		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 29696 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.46, consistent with packed or encrypted content.
ooxml_oleobject_01_ole10native_00.bin
d0e65243df358f9ee7948eadb2c9e55da3344dd9a0ee3fcc11d3188c924dc972		 ole-package OOXML xl/embeddings/oleObject3.bin Ole10Native stream: Ole10Native 28007 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.61, consistent with packed or encrypted content.
ooxml_oleobject_02.bin
364fa12fce9f4eef104fdabe0073fb58f1bdf2fe1e8fc90c223ca936415446e6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 942592 bytes
ooxml_oleobject_02_ole10native_00.bin
4c736c29f84a218a02f53ca510e037fbb7d40e42f738c912cd3275628846c728		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10nATivE 932745 bytes
emf_00.emf
072a6a893b25f4848345ae02773b4dd141c43ec598f34f1da6844dabe6ca8a42		 ooxml-emf OOXML EMF part: xl/media/image2.emf 3042216 bytes
emf_01.emf
ff3e5930814b11204b6613d3118359a2f8284f7a7707ec8c35d4c16563689b94		 ooxml-emf OOXML EMF part: xl/media/image3.emf 1127736 bytes
emf_02.emf
97c56fddf10047bf83af3b7d2f44013f67d6a8d1938464082ff017a032c9280f		 ooxml-emf OOXML EMF part: xl/media/image4.emf 5376 bytes

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