Office (OOXML) / .XLSX malware analysis — malicious · 153347a81aabc477

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 744d6eb151116a890086c582dd30ec5c SHA-1: 0665202282fe48af69a3b425dfc5c2af5317f10f SHA-256: 153347a81aabc4770a57f037f973d423e9748df45f1f1084882983e4a3a7e21b

110 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel document 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 size discrepancy, strongly suggesting it's used to exploit a vulnerability. This exploitation likely leads to arbitrary code execution on the victim's machine.

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 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `28e94414cd6d55f34ff096cb51a5e580170be54389b147f35e1517f272a48d51`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	917504 bytes
`ooxml_oleobject_00_ole10native_00.bin` `89b41f3354c91632be7336aa90a234151cfe5af1b13cd9392dae156c444df1e9`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10nAtiVE	907790 bytes
`ooxml_oleobject_01.bin` `263f42015a42ab5e4c2937dee7a9867fcef45640b0f4248ad757798b0638c512`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject2.bin	1535488 bytes
`ooxml_oleobject_01_ole10native_00.bin` `f7bfcd2cfafe65360c900b06396fb593106749574e01161bc1df7461e65c0804`	ole-package	OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native	1520900 bytes
`ooxml_oleobject_02.bin` `80553cff30dce25f61214f98cbc5fd5ac65d897656b594e6bb7b0e8b057ffab0`	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_02_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_03.bin` `f2e0aee876f60f76883bebd0b5617b49bd36e24c6ad225b6ce20ec94f66fdadc`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm	121969 bytes
`emf_00.emf` `072a6a893b25f4848345ae02773b4dd141c43ec598f34f1da6844dabe6ca8a42`	ooxml-emf	OOXML EMF part: xl/media/image2.emf	3042216 bytes
`emf_01.emf` `c17285d4e2e283c6848e1c16a8d3e6793047f8b862e2246d833f389440c3b86b`	ooxml-emf	OOXML EMF part: xl/media/image3.emf	1127736 bytes
`emf_02.emf` `1ee7f8d2264da4450c31fabcc18767fe6272f012c8c21261ac455a3b3d7db91c`	ooxml-emf	OOXML EMF part: xl/media/image4.emf	5376 bytes

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