Rtf.Dropper.Agent-7635139-0 — RTF malware analysis

Static analysis result for SHA-256 86c6cc771d8b5f8e…

MALICIOUS

RTF

439.8 KB Created: 2020-02-12 First seen: 2020-06-01
MD5: 963941c5f92499c998c56d7ccf2a79ec SHA-1: 9776b5e6b1138bf136cbd0ca55e6ad9598d9c0f5 SHA-256: 86c6cc771d8b5f8e5cd8abb6f5bcab453a145b1b3deb165c11cf0373ca067443
202 Risk Score

Malware Insights

Rtf.Dropper.Agent-7635139-0 · confidence 95%

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

The RTF file contains embedded OLE objects and uses an \objupdate directive, which are strong indicators of malicious intent. ClamAV detection confirms this, identifying it as Rtf.Dropper.Agent-7635139-0. The embedded artifact, objdata_00_off00062df6.bin, likely contains shellcode designed to download additional malware from the identified URLs.

Heuristics 6

  • ClamAV: Rtf.Dropper.Agent-7635139-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7635139-0
  • 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/33xm3o8In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00062df6.bin rtf-objdata-decoded RTF \objdata at offset 0x62DF6 1438 bytes
SHA-256: 6f8419a23a4113f3664fc73f6b194dbf1899568f0231342010402fbbf444ed18
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://bit.ly/33xm3o8 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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