Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 aa30efa1597cfae8…

MALICIOUS

RTF / .DOC

2.00 MB Created: 2019-09-17 13:59:00
MD5: 4b673faab50247c331c775ecc5321006 SHA-1: 37d00fd874e5a7921c51a815e499138cf5ed4f98 SHA-256: aa30efa1597cfae85bc6c230c283dc2323546f25670c0df26b23733be1ca007e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The file is an RTF document containing embedded OLE objects, with heuristics indicating OLE object data and activation. A critical heuristic flags CVE-2017-8759, a known vulnerability related to MSXML SAX OLE activation. This suggests the document is designed to exploit this vulnerability, likely to download and execute a secondary payload. The presence of an embedded URL, though benign, is noted.

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off001f4849.bin
51ef2aab595b626927106c6fa467847210c6c89e8fc52f3b6285788807cfe9df
rtf-objdata-decoded RTF \objdata at offset 0x1F4849 1435 bytes