Malicious RTF — malware analysis report

Static analysis result for SHA-256 817f3a2c49502805…

MALICIOUS

RTF

318.9 KB
MD5: 49fbbd31a58a82c7b58bad88035836e1 SHA-1: c3cfe4545530fb71d291e69c5466ff516f1796d9 SHA-256: 817f3a2c495028057ace3adfa0723e7e698b8bb65c7cdc534e5402a25b7cfff9
182 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566.001 Spearphishing Attachment

The file is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be exploited to execute arbitrary code. The presence of the CLAMAV_DETECTION heuristic with a specific CVE name strongly indicates this exploit vector. The file is classified as malicious due to this exploit. No document body or script content was available for further analysis.

Heuristics 5

  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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 info 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_off0000126d.bin
7d87a4c4dda96462cdca32ba63a0c3ba7dace21c3429097b3c1aa1a93f4ea0e2
rtf-objdata-decoded RTF \objdata at offset 0x126D 160846 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.