Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ffa88c0e759ef6da…

MALICIOUS

RTF / .DOC

324.2 KB Created: 2019-09-17 13:59:00
MD5: 362ee70db12c9aa925ce26484358ab39 SHA-1: 47688feb71dcc0120304491902202e2732ae5593 SHA-256: ffa88c0e759ef6dae762063d5ba2da94cf0b11febaf47e41c9589a8a52beaff0
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains embedded OLE objects and specifically triggers the Equation Editor vulnerability (CVE-2017-8759). The ".objupdate" directive indicates that the embedded OLE object is intended to be activated automatically. This strongly suggests the file is designed to exploit this vulnerability for initial code execution, likely to download and execute a second-stage 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_off0004bf74.bin
e80cabfd27ac4c69b566773d645d0c8bcde2104ddeabb263b8ef8275b5f46467		 rtf-objdata-decoded RTF \objdata at offset 0x4BF74 3739 bytes

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