Malicious RTF — malware analysis report

Static analysis result for SHA-256 909211e583bdd10b…

MALICIOUS

RTF

233.2 KB Created: 2019-01-23 19:55:00 First seen: 2019-05-31
MD5: 3c1361779a54e546d7c3e0e3f522131a SHA-1: dc02ab30551cfc6716b1c578847c137b89da9e1b SHA-256: 909211e583bdd10b5b4e619f55da1a69fbbbd409ed0769a4111b118c845ca84e
182 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object and triggers an update, indicating an attempt to exploit a vulnerability. The critical heuristic firing for CVE-2017-8759 confirms this, suggesting the file is designed to execute arbitrary code. The presence of shellcode API strings and a shellcode URL within an extracted artifact further supports the payload execution scenario. The embedded URL, while currently benign, could be a placeholder or a C2 beacon.

Heuristics 5

  • 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.
  • 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/2Waj0xKIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00024f4d.bin rtf-objdata-decoded RTF \objdata at offset 0x24F4D 1262 bytes
SHA-256: ab5c79966538b1fcdd490d2c29838a3c2b7ed03e271a6c61daf41edcdd98370a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://bit.ly/2Waj0xK 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

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