Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3fee9dd9ad7eeb23…

MALICIOUS

RTF / .DOC

696.6 KB Created: 2021-04-08 20:37:00
MD5: 5508a8d10593b2fcc7100cbf0edab9a1 SHA-1: 1434320ace37bb5ecb4beb2d02f5b8d04b0f5b6d SHA-256: 3fee9dd9ad7eeb2357adc1d38e030485a52de34f9b2fc823558d263d23b498e7
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1203 Exploitation for Client Execution

The file is an RTF document that leverages multiple OLE object vulnerabilities, specifically CVE-2017-8759 and CVE-2026-21514. These vulnerabilities are critical for enabling the automatic activation and update of embedded OLE objects, which is a common technique for delivering malicious payloads. The presence of multiple \objdata sections and a \svb DrsE2oDoc/downRevStg package further indicates the intent to execute embedded code. The document body appears to be a corrupted financial transaction receipt, likely a lure to trick the user into opening the malicious content.

Heuristics 8

  • 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.
  • 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}}\paperw12240\paperh15840\margl1570\margr850\margt1134\margb1134\gutter0\ltrsect

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000451cc.bin
8900687cc986d5bb83d95d3c3ca79ae5539b5b0941b749b8a6ccc9df70bec10a		 rtf-objdata-decoded RTF \objdata at offset 0x451CC 103011 bytes
objdata_01_off0004b97b.bin
863e244e4fe1f26822bd1ca2dc514e7eb052751872258df440befb12324a8328		 rtf-objdata-decoded RTF \objdata at offset 0x4B97B 102984 bytes
objdata_02_off0007feda.bin
3cd3b7d42e5855c90d6d11c54ef2670ed8970441480cc23f7d39ef08fa1c935b		 rtf-objdata-decoded RTF \objdata at offset 0x7FEDA 2632 bytes
objdata_03_off0008147d.bin
e8d4fe950caed6dcfde26f4b616825bbe11b93458425974b7d075167f675abf7		 rtf-objdata-decoded RTF \objdata at offset 0x8147D 12297 bytes
rtf_svb_0000c98b.zip
b968a2cec16a2eccd3aa86666a8f79959f25062cf3ec8dcae40e416083f7cd8a		 rtf-svb-package RTF \svb hex-decoded ZIP at offset 0xC98B 2929 bytes

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