Office (OOXML) / .XLSX malware analysis — malicious · bd87a1a84dbe275b

MALICIOUS

Office (OOXML) / .XLSX

1.43 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000

MD5: b365b8b73cbb1b2d7396296a67198c5a SHA-1: 5a754f8b6b71231d6007dc662504e4020603e961 SHA-256: bd87a1a84dbe275b9e88cb58b217075abd06beb8935123336de8a8cd2f025471

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. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's designed to exploit a vulnerability. The presence of a hidden worksheet further suggests an attempt to conceal malicious activity.

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.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `6007d880527c6575ebe37af81d83db6b1fe07bcb9c19bc60d0a769d84261085f`	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` `994a05711cae2b0b01d65f361942d88b3aa7ac2952b760e992504b664f42499d`	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` `ff9a68101198f6cf43af372d52a8c784f859873c005543c245e06822cd113e5e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	1042432 bytes
`ooxml_oleobject_02_ole10native_00.bin` `04ce8fc5484aba1716c9154431bb706fd29e606c966d12ca97c96e00d7644a53`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NAtIVe	1031760 bytes
`emf_00.emf` `072a6a893b25f4848345ae02773b4dd141c43ec598f34f1da6844dabe6ca8a42`	ooxml-emf	OOXML EMF part: xl/media/image2.emf	3042216 bytes
`emf_01.emf` `3df756b9fb4fa37b0091a51975fa75d3de9687352a2cf54b711b395c0feed855`	ooxml-emf	OOXML EMF part: xl/media/image3.emf	1127736 bytes
`emf_02.emf` `8db5add89a4d98d923949d49c91736217e3d0e38f24b5c77bd867f798163d1c5`	ooxml-emf	OOXML EMF part: xl/media/image4.emf	5376 bytes

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