Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1f28cab09e3fd479…

MALICIOUS

Office (OOXML)

28.1 KB Created: 2010-02-14 08:32:05 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-05-16
MD5: 646eb8c3310f6f94b87adc57ce6483c6 SHA-1: cdb6c27e1572a7bd605bfc7041548dd52764da4e SHA-256: 1f28cab09e3fd4796e5841bae097c95f2803172f424b4c15cc1f7fd5ac71f44e
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a vulnerability related to CVE-2018-0798 within this object, suggesting it's used for arbitrary code execution. This is a common method for delivering secondary payloads, hence the classification as a spearphishing 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.
  • 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: 939b25f04da0f05489f3943925b256a8664679180f5975e8dc60e869c9e7e469
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NAtive 1639 bytes
SHA-256: 4d9a41fdee84f2e08c5f6158f541623198847f74412717a2175a6b18850821e2

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