Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c811a76b7c2938d2…

MALICIOUS

Office (OOXML)

32.2 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-07-24
MD5: 0ff9b467fac499943d96c8af83487e5c SHA-1: d3e7f1c442bd8a42fd9f6ca3c573aee2aa091b6d SHA-256: c811a76b7c2938d2fcc2b455fbf7f73b3390dfe856806ef256020cea782d8f57
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution. This exploit is commonly used to deliver secondary payloads, making the initial document a likely lure for spearphishing.

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: 8cbd9565481ee3db9075dbdb91281578333648f10652c4beb74c4936d50e01ad
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10nATivE 2029 bytes
SHA-256: 44e52b839382595b2c42f5bfd0ae7772939b8ac11d6c394bd31f570acc435e3d

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