Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 de716409da157c49…

MALICIOUS

RTF / .DOC

911.6 KB Created: 2019-09-17 13:59:00
MD5: e8f7d3618967b095f54e7902ea5fb03f SHA-1: ce1dc0cf3816e337c75a42bc43d0bf90113ce182 SHA-256: de716409da157c49c228f137bb9cca1eaa910e10ba360e6a2f6fc53389ad8ada
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The sample is an RTF document containing an embedded OLE object, specifically targeting CVE-2017-8759 through MSXML SAX OLE activation. This indicates an attempt to exploit a known vulnerability for initial execution. The presence of RTF_OBJDATA and RTF_OBJUPDATE heuristics further supports the exploitation of embedded objects. The document also contains a heuristic indicating a password-protected archive lure, suggesting a multi-stage attack where the user is prompted to open a password-protected file, likely containing the final payload.

Heuristics 7

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000dd2de.bin
b1787d7ef4058adc1dcb9a35455762444cc03ed1878c2815344a4f1358489951		 rtf-objdata-decoded RTF \objdata at offset 0xDD2DE 3739 bytes

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