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

Static analysis result for SHA-256 e7a2dd0f83ee6a23…

MALICIOUS

Office (OOXML) / .XLSX

137.2 KB Created: 2020-07-07 21:52:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 16931c525ab6b280c140a4fa6ef1b74d SHA-1: 5a78d548ebf9753823454d78fa750904a3a0a1fa SHA-256: e7a2dd0f83ee6a23d0bf602c1351769b0b8c2904bfcfc00f6a83cb74b294248c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the file is designed to execute arbitrary code upon opening, likely to download and run a secondary payload.

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
443d6b4fbcf40ef65fb52090555a459bea77b98a297880cd9b98ec5306c3f8bd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
23740384626140bb1be5026a90c2b4d90860ecb06e8419789f4cf18831f41992		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NatiVe 2101 bytes

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