Malicious RTF — malware analysis report

Static analysis result for SHA-256 efff41260ca9b138…

MALICIOUS

RTF

5.40 MB Created: 2018-05-27 14:55:00 First seen: 2018-07-23
MD5: 4a02322a2d31ce612dd21fac8367cdb7 SHA-1: 5b7efb30ac7243b275202d70e871aa8a3e75fcb9 SHA-256: efff41260ca9b13825aef540eb97900d91a7036a3d5082ec5e6c853f93b791fb
282 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and triggers multiple critical vulnerabilities, specifically CVE-2017-11882 (Equation Editor) and CVE-2017-8759 (MSXML SAX OLE activation). It also contains excessive hex data and a hidden package, indicating it is designed to download and execute a secondary payload from the URL https://aboveyarri.com/29c.msi. The presence of these exploits strongly suggests a malicious intent, likely delivered via spearphishing.

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.
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1777KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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://aboveyarri.com/29c.msi 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_off005034e7.bin rtf-objdata-decoded RTF \objdata at offset 0x5034E7 15672 bytes
SHA-256: 20215eeee53bbdd95b5763ed5d91b6fc372b797e93988d9f7be21529aa306ae1
rtf_svb_001b61bd.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x1B61BD 1793 bytes
SHA-256: 4ce1f2ec40c451a919f77224d85d9ff905f9195aa5a0c2445e159deea2b45c10

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