Office (OOXML) / .XLSX malware analysis — malicious · 1d6870568276763d

MALICIOUS

Office (OOXML) / .XLSX

675.4 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000

MD5: 564feead027191255d9a9fb15b9ccf2e SHA-1: 7a05152a0a823bc05da9fd30cb5347e242ed5716 SHA-256: 1d6870568276763d4665f43fcb124b7e78d79c4dfe5930f9660d4ec9528aef07

122 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Office Open XML (OOXML) XLSX file containing an embedded OLE object. Static analysis identified a critical heuristic firing for CVE-2017-11882, indicating the Equation Editor OLE object is likely being used to exploit a known vulnerability for code execution. No VBA macros or document body text were extracted, but the presence of the Equation Editor exploit is sufficient evidence for malicious intent.

Heuristics 4

CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `d1aaa1948513c2dd42f0306ca78e6b7824f940c2f8d0ef844bdef6dfaf5404e7`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	327168 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`ooxml_oleobject_01.bin` `4452c953cd8d054b78e1edcdf073b533d45d04d9bf383845b74ba46d04fd7077`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject2.bin	1587712 bytes
`ooxml_oleobject_01_ole10native_00.bin` `d85009cb0f9a593892012a4df8d74182d2ae8fe27d01b2e6029a2b2c0c8b8d19`	ole-package	OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native	1572612 bytes
`emf_00.emf` `78c2466c6539c3c9aecc57dd4b2ea6303724eeaef9925fc568c6da8fc6efde19`	ooxml-emf	OOXML EMF part: xl/media/image2.emf	3145608 bytes

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