RTF / .DOC malware analysis — malicious · b615de9997243c8f

MALICIOUS

RTF / .DOC

5.62 MB Created: 2021-10-27 18:20:00

MD5: 6e5a16bcb17ee13ad0f3cfef446e2904 SHA-1: be860a6fc0a27f2fb775ec6bf73b32c8551ac1b5 SHA-256: b615de9997243c8fbef6fbc8f9e3890c22faa2adc6b3b849540ecff25b7d806a

282 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1559.001 Component Object Model

The RTF document contains multiple OLE objects and triggers the ".objupdate" directive, indicating an attempt to activate embedded content. High-severity heuristics identify exploitation of CVE-2017-8759 and CVE-2026-21514, suggesting the document is designed to execute a malicious payload upon opening. The presence of large hex data blocks within OLE objects further supports the hiding of a payload. No scripts were extracted, but the exploit vectors are clear.

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.
\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
Suspicious extracted artifact medium 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.
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.

Filename	Kind	Source	Size
`objdata_00_off00540dff.bin` `86d485c56bbd83c0f33f39ef78c16fbb327bc33db98fe36a5185c8c255be4272`	rtf-objdata-decoded	RTF \objdata at offset 0x540DFF	96097 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_01_off00571b66.bin` `ad7bf1923f855fca5949d0c557a2a819b106cd84b204870bcc59064eb0c6e331`	rtf-objdata-decoded	RTF \objdata at offset 0x571B66	2632 bytes
`objdata_02_off00573109.bin` `44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037`	rtf-objdata-decoded	RTF \objdata at offset 0x573109	12297 bytes
`rtf_svb_00004896.zip` `24a53a09dd578ae9726b4a2c5f1f2f62fcce17cc0dd17d3ba3b092212bc43d09`	rtf-svb-package	RTF \svb hex-decoded ZIP at offset 0x4896	819490 bytes

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