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

Static analysis result for SHA-256 61758e90fd25030b…

MALICIOUS

Office (OOXML) / .XLSX

12.5 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 111e2e5808406fc3dcf89d4550448206 SHA-1: bfe6ea47b032f6b026adb461c3bb274a7865ba73 SHA-256: 61758e90fd25030b4a118cf9ee1a18a04a8f43a12ccc86bf120ed1a1451ff157
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office Open XML (OOXML) spreadsheet containing an embedded OLE object. Heuristics indicate this object is a Microsoft Equation Editor exploit, specifically targeting CVE-2018-0798. This type of exploit typically executes arbitrary code, which is then used to download and run a secondary malicious payload. The document body content appears to be a list of medical supplies and laboratory equipment, likely a lure.

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.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
9aaf8f531b74db957943e1f06fb4a86e136a2dc568797dd3f722b3f34ec1db31		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
2cd31837fb6218570743700c15d72e01992b55eaaf2d92babad96ba4f025b2fc		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10naTiVe 1863 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.