Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 64efa4b558c82116…

MALICIOUS

Office (OOXML)

20.1 KB Created: 2016-10-11 20:30:46 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-08-04
MD5: ffd42ab7e4ad96cddac74b020d173fdc SHA-1: b7ff59c51465d2d479d94dffc0ecb021d3c11165 SHA-256: 64efa4b558c821165cf543d858a929f5a747072afc75f48462c360f80a54c3c0
248 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in the Equation Editor. This vulnerability allows for arbitrary code execution, which is the primary mechanism for this attack. The document body contains what appears to be a fake invoice, suggesting a lure to entice the user to open the document.

Heuristics 5

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • 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
  • 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 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: b07186d8b05aafc0d204ef49751a10564d4bba3a169a478f68c818bab864b8e3
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.