Malicious RTF — malware analysis report

Static analysis result for SHA-256 193d5f7523af4620…

MALICIOUS

RTF

512.3 KB Created: 2019-01-23 19:55:00 First seen: 2019-08-04
MD5: 077d0243ee3eb6f3bd8fb291851eebd9 SHA-1: a5f93fa04ce868b193ef2250cbbbccdad1cd2d50 SHA-256: 193d5f7523af46202908addcebb4528df2f7d7313ec71dc7e78a259934c13d79
242 Risk Score

Malware Insights

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

The RTF file contains an OLE object that exploits CVE-2017-8759, a known vulnerability for client execution. Static triage indicates the presence of shellcode and a URL, suggesting the file acts as a dropper for a second-stage payload. The embedded OLE object, objdata_00_off000613d4.bin, is likely the component responsible for fetching and executing this payload.

Heuristics 6

  • 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-6970773-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-6970773-0
  • 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 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
    • https://bit.ly/2HvinZkIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000613d4.bin rtf-objdata-decoded RTF \objdata at offset 0x613D4 1262 bytes
SHA-256: f2ed76742b495fd072764948e9638ee7d36221fdb222bbf19c4bb24a8df0dca7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://bit.ly/2HvinZk 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, CreateProcessA, ExitProcess

Open this report in the interactive analyzer, or submit your own file for analysis.