Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3091a26061031664…

MALICIOUS

Office (OOXML)

54.7 KB Created: 2017-05-03 05:29:29 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-08-04
MD5: 33849063f5d4ebd0f7b2378da041813a SHA-1: b1cbe18ef547ef7fedadbbe6daa070a356220011 SHA-256: 3091a26061031664cb1a587cc5c266bd317e5f7f6301d11850dc6a26cebd10a2
260 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object that exploits CVE-2017-11882 in Microsoft Equation Editor. The document body displays a fake purchase order and instructs the user to enable editing, a common lure to bypass macro security. This exploit is known to deliver a malicious payload.

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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

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: 4597f8e53e38937d92b5e58f9b9872adefe2bb7cdd59d865db772e383d821e06
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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