Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 22df030a7266d9b6…

MALICIOUS

Office (OOXML)

74.3 KB Created: 2018-09-15 07:38:48 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-05-16
MD5: 9ae7e3137ca7175735d6401c909b438f SHA-1: e37733e045df441041e909398d101d33c1f8d748 SHA-256: 22df030a7266d9b6ecaba24da2db2a1e8973e876b91c2eb13b9376bd42972047
108 Risk Score

Malware Insights

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

The file is a malicious Excel document containing an embedded OLE object that exploits CVE-2018-0798 in the Equation Editor. This vulnerability allows for arbitrary code execution, which is likely used to download and run a secondary payload. The document body contains text related to a tariff proposal, suggesting a lure to entice the user to open the document.

Heuristics 4

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

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: 7a6f8a41cbce30c3b0b3059d907362ab9e816ab64526e702cb50a82430681a94
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NATIve 2011 bytes
SHA-256: c82bdac14cd84a6abd3d3cf39a2e10a36410ef32d176359a5f5c899018994e0f

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