Malicious RTF — malware analysis report

Static analysis result for SHA-256 465a96ed6381bba2…

MALICIOUS

RTF

140.2 KB Created: 2020-02-12 First seen: 2020-05-25
MD5: a7df2d8163658edf46361519ec22aa86 SHA-1: 89e1cd419f1fa4928ac09fe7e20b6da37f570375 SHA-256: 465a96ed6381bba2ff9ff3fd74b907c7bc45bd844fd60a3b9cf7aee016667211
202 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and uses \objupdate to force OLE activation, indicating exploitation of CVE-2017-8759. This vulnerability allows for client-side execution, likely to download and run a secondary payload from the embedded URL. The extracted artifact 'objdata_00_off0001faee.bin' is also flagged as suspicious.

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.
  • 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 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.mic In RTF body
    • http://bit.ly/32nlRqNIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0001faee.bin rtf-objdata-decoded RTF \objdata at offset 0x1FAEE 1438 bytes
SHA-256: 1880299ed219cb3f7014813197d931c66bb8e6a1f47218972cdce984abb4dbfe
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://bit.ly/32nlRqN 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, ExitProcess

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