Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 bbd5929cee1e4e4c…

MALICIOUS

RTF / .DOC

2.92 MB Created: 2019-09-17 13:59:00
MD5: 2bb8b003b3ea35cb315b7d876ecce22e SHA-1: bae561c92fd017950e2c68edf76b1c817ece9b54 SHA-256: bbd5929cee1e4e4cd6ed076f4215217d061ea57ab8e4924ccbdb4e15816a5d5a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-8759) to achieve code execution. The presence of OLE object data and an explicit ".objupdate" call further indicate an attempt to activate embedded objects. The "Password-protected archive handoff" heuristic suggests the document's primary purpose is to trick the user into opening a password-protected archive, which likely contains the actual malware payload. The document body is heavily obfuscated and does not provide clear textual clues about the lure.

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_off002da4c1.bin
f8883f7953d04ee2c747fe8a956a1ce406fb4a5f21dcd084acf0b7b4f3ffb647		 rtf-objdata-decoded RTF \objdata at offset 0x2DA4C1 3732 bytes

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