Malicious RTF — malware analysis report

Static analysis result for SHA-256 2a73f59e3bf5fd59…

MALICIOUS

RTF

235.8 KB Created: 2019-01-23 19:55:00 First seen: 2019-11-20
MD5: c2aadf1d381c3f06980cbd3573e51f3b SHA-1: 5139e90b8b803cf0ca97a8e3f36b4e481e003fbc SHA-256: 2a73f59e3bf5fd593d810ce34aa1c3e2fcda88b03e3c866660285f9533655819
182 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that is triggered for activation via \objupdate, exploiting CVE-2017-8759. This exploit likely leads to the execution of shellcode found within the extracted artifact 'objdata_00_off000282bf.bin', which in turn may download a secondary payload from one of the embedded URLs. The benign reputation of the URLs suggests they may be decoys or part of a multi-stage process.

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.
  • Suspicious extracted artifact critical EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • \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 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 In RTF body
    • https://bit.ly/2JAqxlRIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000282bf.bin rtf-objdata-decoded RTF \objdata at offset 0x282BF 1262 bytes
SHA-256: e674b0b08498a7e2f430f4969553e5ce3dc89e159a42d358ac13fb0cec19aa7f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://bit.ly/2JAqxlR Static shellcode analysis found candidate code region(s). Indicators: SC_STR_LOADLIBRARY, SC_STR_URLDOWNLOAD, SC_PEB_ACCESS Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, URLDownloadToFileA, CreateProcessA, ExitProcess

Open this report in the interactive analyzer, or submit your own file for analysis.