Rtf.Dropper.Agent-7602733-0 — RTF malware analysis

Static analysis result for SHA-256 01aecb9a700bcbe3…

MALICIOUS

RTF

133.8 KB Created: 2020-02-12 First seen: 2020-09-07
MD5: 8753cfc6d66760efe4d25ea70d5add2a SHA-1: ebd560deb894b5dd0a2ea389661880002384db45 SHA-256: 01aecb9a700bcbe3c08ebab7aba69ad43e8abf713414cfcb94d5c240bfc92458
262 Risk Score

Malware Insights

Rtf.Dropper.Agent-7602733-0 · confidence 95%

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

The RTF document contains embedded OLE object data and uses \objupdate to force activation, indicating an attempt to exploit vulnerabilities. Specifically, the CVE-2017-8759 heuristic firing confirms the exploitation of MSXML SAX OLE activation. The ClamAV detection and static triage further support its classification as a dropper, likely designed to download and execute a secondary payload from the embedded URL.

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-7602733-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7602733-0
  • 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.mic In RTF body
    • http://bit.ly/2VmMmvhIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0001e125.bin rtf-objdata-decoded RTF \objdata at offset 0x1E125 1438 bytes
SHA-256: 4c61ce0174b32c2c9b592f0ef0bdf5eaecae0171fc85e53ea12cde1f48678b79
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://bit.ly/2VmMmvh 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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