Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a1d8981021afa14f…

MALICIOUS

Office (OOXML)

122.3 KB Created: 2015-09-01 20:32:58 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2018-10-07
MD5: 09ad0a116ffce42d6ba7c694bcbb3919 SHA-1: 24444ab7f785f6cd67a76422686e5c04446133b4 SHA-256: a1d8981021afa14fcd857341cf84f39bad00d890021a2dca70d42e00a3889131
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object that triggers a high-severity heuristic for CVE-2018-0798, indicating exploitation of the Equation Editor. This exploit is commonly used to achieve arbitrary code execution, likely for downloading and running a secondary payload. The document body appears to be a fabricated parts quote, a common lure for phishing attacks.

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: 1cf519167599b9f47b9ec5076a58cb4354d3d32b1b0610280b8eb5aca69c2373
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1932 bytes
SHA-256: cfc1f0efa9cf7bb03d84254fe1befaa43b737d96d74f9bafa7922e700e77153d

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