Rtf.Dropper.Agent-7701028-0 — RTF malware analysis

Static analysis result for SHA-256 22e4f3c1301950f9…

MALICIOUS

RTF

1.22 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: 302fbe72b5e95d7a19a1bf3f33b15397 SHA-1: 561c12df19f0db81cb7bfaf557f9056c5011cfac SHA-256: 22e4f3c1301950f925c3ef3ead36ca5d82ab9a13f5fce1e144952e0aac87af53
222 Risk Score

Malware Insights

Rtf.Dropper.Agent-7701028-0 · confidence 95%

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

The RTF file contains an embedded OLE object that is activated via \objupdate, exploiting CVE-2017-8759. ClamAV identifies this as Rtf.Dropper.Agent-7701028-0, indicating its dropper functionality. The embedded OLE object likely serves to download and execute a secondary malicious payload.

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-7701028-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7701028-0
  • \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 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00130d36.bin rtf-objdata-decoded RTF \objdata at offset 0x130D36 1350 bytes
SHA-256: 617afc7f6b82ee33609d2299ab57fc953dce3b287b79921e5768fed0f7cfe27d
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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