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

Static analysis result for SHA-256 0b7eae3b9b5c1bf2…

MALICIOUS

Office (OOXML) / .XLSX

517.2 KB Created: 2020-01-20 17:22:23 UTC Authoring application: Microsoft Excel 15.0300
MD5: d2cd5ec4e6969f233b453f904f8e5942 SHA-1: 4082757ee9dcabf7ea514c71988d4461cd7ddfb6 SHA-256: 0b7eae3b9b5c1bf21d6a3ed757479ab8b612242860102fdfe64f78b714ff5685
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. The document body lists shipping companies, suggesting a potential lure for spearphishing, but does not contain direct instructions or further malicious content. The primary attack vector appears to be the exploitation of the Equation Editor vulnerability to deliver a malicious 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
4647b7da508c2a8292767c024416b4ca8e9bdb6f293739f1b4b84fa97940f60d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
d2ffa58a606ac2a817e953395c6f3ea59cac36dfda4eae440fdcaf31148283ca		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10naTive 1347 bytes

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