Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2928262ca2271dc4…

MALICIOUS

Office (OOXML)

36.1 KB Created: 2019-03-18 20:41:36 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-08-04
MD5: 9efda574faac2b66f467398053598df5 SHA-1: ec5ae72c1233590dbc8bd3ee1dd1e14f06582166 SHA-256: 2928262ca2271dc48eb5a4289a988f4b8b51e63423d46243183a89ea57c56a6b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics and ClamAV detection confirm this is a known exploit for CVE-2017-11882, which allows for arbitrary code execution. The document body content appears to be a budget template, likely a lure to disguise the malicious embedded object.

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.
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • 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: c254ea3b55eae0f57f0903df1cae17597ed0467e04ed6a95372785e7becad3f1
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely
emf_00.emf ooxml-emf OOXML EMF part: xl/media/image1.emf 4056 bytes
SHA-256: 272937d3a78fa3875cee073b0c04a2f9c9438aaeed043eb1f9b18b8afa283def

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