Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 289c19cf74628058…

MALICIOUS

RTF / .DOC

2.05 MB Created: 2019-09-17 13:59:00
MD5: 06d9c23ed0ef1ca2243ef5e039b9fbe2 SHA-1: c3baf6f969010c8c08cf1ed1ce7e06d0a4463dca SHA-256: 289c19cf74628058d7012f643351f2bcc6bb0add93689ec7a6248ed4c55a3d01
200 Risk Score

Malware Insights

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

The file is an RTF document containing embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-8759). The ".objupdate" heuristic indicates that the OLE object is designed to be activated automatically upon opening. This suggests the document's primary purpose is to exploit this known vulnerability to execute arbitrary code, likely to download and run a secondary payload.

Heuristics 6

  • 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.
  • 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_off001f33df.bin
6a930b57cdc95eca6902278412a086820d0f2fd9bdb3f3a4240cf71bf2b05308		 rtf-objdata-decoded RTF \objdata at offset 0x1F33DF 3732 bytes

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