Malicious RTF — malware analysis report

Static analysis result for SHA-256 15c24c6c2832fef3…

MALICIOUS

RTF

68.1 KB First seen: 2019-02-10
MD5: c317e891afb3c78811b17089729d2f66 SHA-1: 2d8c26a1b70615e15c882a9a4c43091b61f499f1 SHA-256: 15c24c6c2832fef3ae6d2cb5b823f5402388007e941b26ca354ea3080939230c
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and an \objupdate directive, which are indicative of an attempt to trigger OLE activation. ClamAV specifically identifies this file as Doc.Exploit.CVE_2017_11882-6934206-0, confirming exploitation of the Equation Editor vulnerability. This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload.

Heuristics 4

  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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
  • Suspicious extracted artifact medium 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4131 bytes
SHA-256: b9773bcfa14177a78af99fa433ad4775d253fe706ee41a0a1fbfe3503e232c9e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL