Rtf.Dropper.Agent-6987512-0 — RTF malware analysis

Static analysis result for SHA-256 87e8f647494afd49…

MALICIOUS

RTF

90.1 KB Created: 2019-05-28 19:25:00 First seen: 2019-08-04
MD5: 2bdcef1c346ce611ea5674d676360b29 SHA-1: c877a3affaa1deca9774f039c2089282f9af931a SHA-256: 87e8f647494afd49b700b0e1c3bce2d9554bd9a81be95ac3ef655c1ee3e3274c
262 Risk Score

Malware Insights

Rtf.Dropper.Agent-6987512-0 · confidence 95%

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

The file is an RTF document containing an embedded OLE object that is triggered via \objupdate, exploiting CVE-2017-8759. This exploit likely leads to the execution of shellcode found within the object data, as indicated by the 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic. The ClamAV detection name 'Rtf.Dropper.Agent-6987512-0' further supports its function as a dropper.

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.
  • ClamAV: Rtf.Dropper.Agent-6987512-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-6987512-0
  • 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.microsoft.com/office/word/2003/wordml In RTF body
    • https://bit.ly/2QQdxdLIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0001366e.bin rtf-objdata-decoded RTF \objdata at offset 0x1366E 1400 bytes
SHA-256: deace41ffda4f49aad6025f526f56e9e03a18ce9496aaec0a48e1b17b2219a8d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://bit.ly/2QQdxdL 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, ShellExecuteA, ExitProcess

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