Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 f7c2a58e5348500f…

MALICIOUS

RTF / .DOC

318.8 KB
MD5: 6656a1fdc5ed8df42d47f61c751ac64e SHA-1: cee2ff6740dbcd326d985e20c3301fec2abc5684 SHA-256: f7c2a58e5348500fdbc653498b4cd58a6afe18c2a2ff7c175c3c23b5c8525853
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1129 Shared Modules

The file is an RTF document containing an embedded OLE object, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). This indicates the document is designed to exploit this known vulnerability upon opening, likely to download and execute a secondary payload. The high confidence is due to the direct detection of the CVE-2017-11882 exploit.

Heuristics 6

  • 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
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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_off0000119b.bin
2ed842bbb69c29bcc80963804d4cfb6edd492b4319b5a12e590d20dfbcec2554
rtf-objdata-decoded RTF \objdata at offset 0x119B 160851 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.