Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1d9cab83bfbf2cf3…

MALICIOUS

RTF / .DOC

5.66 MB Created: 2021-10-27 18:20:00
MD5: 08664701393693b796198f6c65d2c3da SHA-1: 1ab6a21157700abf22a3addd861af8168b0209d8 SHA-256: 1d9cab83bfbf2cf369013836583667126a104ee0c1074195e86aea979f6e1bf0
302 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1566.001 Phishing: Spearphishing Attachment

The RTF file contains multiple indicators of malicious OLE object embedding and activation, specifically targeting CVE-2017-8759 and CVE-2026-21514. The presence of large hex-encoded data blocks within OLE objects and a hidden package within the RTF structure strongly suggests the embedding of a secondary payload. The exploitation of these vulnerabilities likely leads to the execution of this payload.

Heuristics 9

  • 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1651KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \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}}\paperw12240\paperh15840\margl1440\margr1440\margt1440\margb1440\gutter0\ltrsect

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00540dff.bin
13930ba6381917176d6449bd0e3985cae2cc8a5817402efce228cfa66889e975		 rtf-objdata-decoded RTF \objdata at offset 0x540DFF 116596 bytes
objdata_01_off0057c1f8.bin
c19bdae77a50c4ca68c6e787f32f6a9c5ff54fdf8b02913f44c1ac33b401643a		 rtf-objdata-decoded RTF \objdata at offset 0x57C1F8 2632 bytes
objdata_02_off0057d79b.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0x57D79B 12297 bytes
rtf_svb_00004896.zip
24a53a09dd578ae9726b4a2c5f1f2f62fcce17cc0dd17d3ba3b092212bc43d09		 rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x4896 819490 bytes

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