Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9607e496b7b76cf6…

MALICIOUS

Office (OOXML)

8.4 KB Created: 2019-05-27 22:54:04 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-07-24
MD5: cc9a9e2ca1d71906102fac0931487473 SHA-1: 0b4d77e3a6f9275b9ff1d2935b5e4561bdd52c2e SHA-256: 9607e496b7b76cf6846f7ba86cdb7e42120d321cf5c035a3e55d3e3bb2307d54
184 Risk Score

Malware Insights

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

The file contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882), as indicated by ClamAV detections. This exploit is designed to download and execute a secondary payload from the URL http://wordpress.tanner-it.ch/wp-content/upgrade/file/obi.exe, likely leading to further system compromise.

Heuristics 5

  • 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
  • Payload URL recovered from embedded OLE object (1 URL) info OOXML_EMBEDDED_OBJECT_URL
    An embedded OLE object (xl/word/ppt embeddings) carries a next-stage download URL in its Ole10Native/Package stream — stored literally (incl. UTF-16) or base64-encoded — which the package-level URL sweep does not see. Surfaced as an IOC; self-validating (only real payload hosts).
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://wordpress.tanner-it.ch/wp-content/upgrade/file/obi.exe In document text (OOXML body / shared strings)

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 3584 bytes
SHA-256: 9dab680d66a098f0a32ba01071ca8688509fea80844cbda3d0e7ae6d7804e6bf
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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