Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a16740d40c2ac9bd…

MALICIOUS

Office (OOXML)

22.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-08-04
MD5: bb40f81a07d454b24edcdc7745f9e00e SHA-1: 9a586302d844e2917002e07e39560702a04042d8 SHA-256: a16740d40c2ac9bdc65f54b44582e86159f5f808fefb6093d59a63192991b3b5
200 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a lure to enable editing and a critical ClamAV detection for Doc.Exploit.CVE_2017_11882-6934206-0, strongly suggesting exploitation of the CVE-2017-11882 vulnerability. This points to a malicious document likely delivered via spearphishing, designed to execute an exploit upon user interaction.

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.
  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

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: 3e38a31021a8ba81f780be60830343b1204db11bd1060d61d732423ce5cca632
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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