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

Static analysis result for SHA-256 447a7be2d4c51daf…

MALICIOUS

RTF

126.5 KB Created: 2019-01-20 14:19:00 First seen: 2019-04-18
MD5: f423b79ebab0425d1e5ad4f60ed8d491 SHA-1: acdbdfac317e48ad73db3049b08149072badcb92 SHA-256: 447a7be2d4c51dafa3750c5b45cafd4e596a147c966ea365f93e86825f2e4c91
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-6853553-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-6853553-0
  • \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_off000116d9.bin rtf-objdata-decoded RTF \objdata at offset 0x116D9 8592 bytes
SHA-256: 67ff0449c56810ed91342d38f4bcc93b13e25946a55d6fed92fc2708e3e82c64
objdata_01_off00015aa9.bin rtf-objdata-decoded RTF \objdata at offset 0x15AA9 6841 bytes
SHA-256: 4ae82c1a309daeb1f275c17cac194a77ad74999b4c0ff1a8f16ca57c4f14dcfb
objdata_02_off000193c9.bin rtf-objdata-decoded RTF \objdata at offset 0x193C9 12923 bytes
SHA-256: a8466c0c5ff0a24dae6fa084ab784e2c95d8d1b5fdd8d6a62313e4f2e415333e
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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