Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0a5cfd337c076e06…

MALICIOUS

Office (OOXML)

9.3 KB Created: 2018-09-17 07:54:41 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-05-16
MD5: 198636278e3feb3326e6982ad0fda88d SHA-1: 6b787d4e3e0e219d2aeb145da80dcf1af62003b1 SHA-256: 0a5cfd337c076e0682e337527296c00f6597203e1b837a6161f28190667067e7
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 4608 bytes
SHA-256: 57656b5256c4bcaa704c8342ddf2a600fd6a37b69f2fa20abbf486707ef1435b
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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