Rtf.Dropper.Agent-6870260-0 — RTF malware analysis

Static analysis result for SHA-256 f78739e03565b47a…

MALICIOUS

RTF

133.0 KB Created: 2019-01-20 14:19:00 First seen: 2019-11-20
MD5: 8ba4b606fa8d99f03f6d72f142b6ab3e SHA-1: 59af63f6644c3bbe23e0d6dcafda12fe9f672998 SHA-256: f78739e03565b47af0a7173badc43a78fba865eb49e46777fbe3fe08892ddace
262 Risk Score

Malware Insights

Rtf.Dropper.Agent-6870260-0 · confidence 95%

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects and specifically targets the Equation Editor, triggering heuristics for CVE-2017-8759. This indicates an attempt to exploit a client-side vulnerability for code execution. The ClamAV detection name 'Rtf.Dropper.Agent-6870260-0' and the presence of suspicious extracted artifacts like shellcode API strings suggest the file acts as a dropper for further malicious activity.

Heuristics 7

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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-6870260-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-6870260-0
  • \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 3 \objdata section(s) — embedded OLE objects
  • Suspicious extracted artifact medium 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.
  • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000116bc.bin rtf-objdata-decoded RTF \objdata at offset 0x116BC 8592 bytes
SHA-256: 644724bf45a92dd8781e05b84d2e4d1a9770aa9499ba44ebc8a45ae895a92cd3
objdata_01_off00015a8c.bin rtf-objdata-decoded RTF \objdata at offset 0x15A8C 10172 bytes
SHA-256: 41f45b1fa7d21898a44da35c79c689ffa16478b65d170849dc81b530ca5433ea
objdata_02_off0001ada2.bin rtf-objdata-decoded RTF \objdata at offset 0x1ADA2 12923 bytes
SHA-256: 5a27d47725f04af2dfa616fce03c1ca75066dc43a7197511d6d77e893c0ddc14
Detection
ClamAV: No threats found
Obfuscation or payload: likely
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: LoadLibraryW, GetProcAddress, URLDownloadToFileW, ExitProcess

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