Malicious RTF — malware analysis report

Static analysis result for SHA-256 f49e55b2ba3ad118…

MALICIOUS

RTF

734.5 KB Created: 2021-04-08 20:37:00 First seen: 2021-06-13
MD5: 67fd8a197e9838c864f76af80973a61f SHA-1: 0d409242887fafd472c1a2b5584afcbb27a68919 SHA-256: f49e55b2ba3ad1186c0bd7ada43bf2a4d8c05e48ff578be6bdd5822119dd4e27
362 Risk Score

Malware Insights

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

The RTF document contains multiple critical heuristic firings related to OLE object manipulation and known vulnerabilities (CVE-2017-8570, CVE-2017-8759, CVE-2026-21514). These vulnerabilities allow for the automatic updating and activation of embedded OLE objects, which are used to drop and execute a script. The presence of embedded OLE data and the specific CVEs strongly indicate an exploitation attempt for client execution.

Heuristics 10

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • 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.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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.
  • Suspicious extracted artifact high 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 4 \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 http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000451c3.bin rtf-objdata-decoded RTF \objdata at offset 0x451C3 121670 bytes
SHA-256: 69d48c7f848b97ea2ae7ba04530e4fe39a398caa14a56f819903fd0cca496198
objdata_01_off0004b972.bin rtf-objdata-decoded RTF \objdata at offset 0x4B972 121643 bytes
SHA-256: 04067640d7daf02edd65489a4ac21c8f63404d0a510e43d2523f28685bfa2363
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): WScript.Shell"")")
objdata_02_off0008966d.bin rtf-objdata-decoded RTF \objdata at offset 0x8966D 2632 bytes
SHA-256: 32e8e449cdc043249ce37c79c9eaf2af80a02cb8175718a8a0ce726d961b7d16
objdata_03_off0008ac10.bin rtf-objdata-decoded RTF \objdata at offset 0x8AC10 12297 bytes
SHA-256: e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7
rtf_svb_0000c982.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0xC982 2929 bytes
SHA-256: b968a2cec16a2eccd3aa86666a8f79959f25062cf3ec8dcae40e416083f7cd8a

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