Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9550d205afa47e98…

MALICIOUS

Office (OOXML)

9.5 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-05-10
MD5: 30cbe4b2cfd0a257bbea813f7a853bcf SHA-1: 4063e36dfebc91f0e783587b53bb49266e16a430 SHA-256: 9550d205afa47e98e5537983da05c27bcd72d4ec4f4ab15f735b3350eeb9295d
240 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of the CVE-2017-11882 vulnerability within an embedded Equation Editor OLE object. This vulnerability is known to allow for arbitrary code execution when the document is opened. The file is classified as malicious due to this exploit.

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 4096 bytes
SHA-256: f4944958a771445dcd0cc7759cc0839b804714c6e065a746522bb840174e9e1f
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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