Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1b2665e97cb2919d…

MALICIOUS

RTF / .DOC

624.4 KB Created: 2019-09-17 13:59:00
MD5: 2e10cad0dbdb672bc7e325ca381fcc14 SHA-1: 3ae4c2ce22025b3be8ecaf7d97c801211fecaa16 SHA-256: 1b2665e97cb2919de67938ec3342095def560fa57846a9da7016abf975cd7678
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The file is an RTF document containing embedded OLE objects, with heuristics indicating the exploitation of CVE-2017-8759. This vulnerability allows for OLE activation, which is likely used to execute arbitrary code. The presence of ".objdata" and ".objupdate" sections further supports this attack vector. No specific malware family could be identified, but the exploit method is clear.

Heuristics 5

  • 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.
  • \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 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
    • http://schemas.microsoft.com/office/word/2003/wordml}}\paperw12240\paperh15840\margl1440\margr1440\margt1440\margb1440\gutter0\ltrsect

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0008ea5b.bin
c0e47c19dc4f77ff7896c1121ba3953d5b40afc86f19eec2e5d7a6b93a90d5ed		 rtf-objdata-decoded RTF \objdata at offset 0x8EA5B 1435 bytes

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