Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d82c8ee26d77c2d8…

MALICIOUS

Office (OOXML)

9.1 KB Created: 2018-10-01 05:12:08 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-05-25
MD5: 9a89a31ef086e27583e90f3ed11e935c SHA-1: 6ec7f6e5c8dc86a259acf7385bed4b6e553af117 SHA-256: d82c8ee26d77c2d82c67261fcdb9b4d77901842a8f1e824573627789a217bb4d
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. Critical heuristics indicate a successful exploitation of CVE-2017-11882 through a FONT record overflow within this object. This vulnerability is known to allow arbitrary code execution, making it the primary attack vector.

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: c05a8414f33e508a545479803fcdc1ed090216a16a154af29f906e8b8be21920
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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