Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ce81be913f291018…

MALICIOUS

Office (OOXML)

18.2 KB Created: 2018-10-26 06:11:23 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-07-02
MD5: 410823051c3918815196b12455022900 SHA-1: e0ae4f08ea4e04b0ff495bf062ded99891e144ab SHA-256: ce81be913f291018a0aca1c6b2bad3df3a2a9b4da52df46a14c0886308a85388
240 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 upon opening the document, indicating a malicious intent to compromise the user's system. The ClamAV detection further confirms the malicious nature of the embedded artifact.

Heuristics 4

  • 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

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: d8f783ba94f80213fee0468c30385b404128b0644625a621a12dbe22a9653fdd
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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