Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b91b141080cc8cbb…

MALICIOUS

Office (OOXML)

15.4 KB Created: 2016-09-30 10:43:03 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2018-10-07
MD5: 87d961e3a4f88c52a1fb28a7d4e2c5fa SHA-1: 9c48c72d762232d90925bd978d4b9a91ba24a85c SHA-256: b91b141080cc8cbb048aed7ba99a89c8aebc987ab24802d5679a601bb9309591
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object identified as Equation Editor. High-severity heuristics indicate a potential exploitation of CVE-2018-0798, which allows for arbitrary code execution. The embedded object is the primary indicator of this exploit.

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: 1839b11ce68ca9253ed8453f4faa0ab6fc835233f44db04bc6db7f36b54ba136
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2010 bytes
SHA-256: 45701137807856911ccaf5cdd1e62f62d920e27072aa255baf5ac500d899e14b

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