Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b91b76b0ef37f637…

MALICIOUS

Office (OOXML)

62.7 KB Created: 2018-09-09 12:27:30 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-07-07
MD5: 17886fc10f1310f643bffdcfa5d3d09f SHA-1: 5cf67eeadb8709cdfd74e2a8ecf0863c7f3f2f02 SHA-256: b91b76b0ef37f637300d01009a9e860d95fb34ab75f15a754dc2796a6e8ddb5f
280 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor exploit targeting CVE-2017-11882. The document also contains a lure instructing the user to enable editing, which is a common tactic for macro-based malware. The embedded OLE object was flagged by ClamAV as malicious, confirming the exploit's presence and malicious intent.

Heuristics 6

  • 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
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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: 9971c30b5c4a0abafd748b6e8618941d021a42d3cac59804106487683210ed78
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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