Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a2df3bd2cfe2213b…

MALICIOUS

RTF / .DOC

637.1 KB Created: 2019-09-17 13:59:00
MD5: e10ae288d4d8270e9091738581a1c041 SHA-1: 8f2a111b483992c8a6ba28c365f3c890666deef2 SHA-256: a2df3bd2cfe2213b7e2673c280bd4bc0297c560ed27de312d6cb2673a94f230b
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 User Execution: Malicious Link T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The sample is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a vulnerability in MSXML that allows for OLE activation. The presence of RTF_OBJUPDATE suggests the exploit is designed to trigger automatically. The document also contains a heuristic for password-protected archive lures, indicating a likely multi-stage attack where the initial document facilitates the download and execution of a subsequent 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_off00096729.bin
151ac4c1cbc34a37d08eb65511934cf72a55000fe635ab96e3d08f8ecd42ebea		 rtf-objdata-decoded RTF \objdata at offset 0x96729 3739 bytes

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