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

Static analysis result for SHA-256 924f1fd1a05a7b1c…

MALICIOUS

Office (OOXML) / .XLSX

602.6 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 956ef49936df135b159215b420f77357 SHA-1: 08e469995d6d94d12f97ccc8a758d98c75120f37 SHA-256: 924f1fd1a05a7b1c6b521b1358fc0203b9796dff3da1dc39eccce9b0825dc606
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's being used as an exploit vector. The presence of an embedded OLE object within an Office document is a common delivery mechanism for malicious payloads, often initiated by a user opening a malicious attachment.

Heuristics 3

  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
e5ea98d64c379313b9002d5e76f7a8377bd15c9c0ac7ffd1571f5f81efb2d2f3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 900608 bytes
ooxml_oleobject_00_ole10native_00.bin
95001f469d1627343c5d914bc972849c0ce65d7bf551bf158a2deca3805c89ff		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10natiVe 891260 bytes

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