Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1c3163c35513eebc…

MALICIOUS

Office (OOXML)

887.4 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-05-23
MD5: c9e9721dba186a0a3508fedbabcfd81b SHA-1: f71e2c8fb74de39e75049e9d65d6d43c1de36aea SHA-256: 1c3163c35513eebc97bb2067631b7c2a38f4bdf7a3dc9347529b383d30a46c7f
68 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 an Equation Editor object. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution. No specific malware family could be identified from the available evidence.

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.
  • 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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 827904 bytes
SHA-256: 09e8c27db2ee39b7376b8d55d5df1cf857c7cee9f59e8a17d88d7471575a3177
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NaTIVE 818970 bytes
SHA-256: bb82ef5ad7d34ddbeeca4cf1c2cd700cf4a62227f58d00003ab86922ab36600f
ooxml_oleobject_01.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 1614848 bytes
SHA-256: 9bf1a0a6561a407d410e990a7ba26f967c0f630dc53ab5a781f7810f5385c0ac
ooxml_oleobject_01_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 1599780 bytes
SHA-256: ae6173ee54937f64c652977a63ceeb27438c18c8874634ccf808a82e16b09e02
emf_00.emf ooxml-emf OOXML EMF part: xl/media/image2.emf 3199944 bytes
SHA-256: 3a9c525d24d8be65c6b9d130ac603eb897faac656f1df27e499489263563ab82

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