Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 22f2dbc69ab7c7f5…

MALICIOUS

RTF / .DOC

1.13 MB Created: 2019-09-17 13:59:00
MD5: 0bfeeffdb8f0356660fc3919ea0de4f5 SHA-1: 50518d15c00ee608ab4c75812b604b99b858544c SHA-256: 22f2dbc69ab7c7f579452bf6dc12ada3ec3717ed1c3e5a3c769940638ec1cbe2
240 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 RTF document contains embedded OLE objects and specifically targets CVE-2017-8759 through MSXML SAX OLE activation. This indicates a high likelihood of arbitrary code execution. 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 malicious payload, after providing password instructions.

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_off0011a4ac.bin
e1c96d74a8f13b60d1668edd00882092336f04ca7b96017b49dc2361a21117ed		 rtf-objdata-decoded RTF \objdata at offset 0x11A4AC 3739 bytes

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