Malicious RTF — malware analysis report

Static analysis result for SHA-256 2f60bb5e3e5fe378…

MALICIOUS

RTF

318.3 KB
MD5: afbc11783966c6e77b956cf90aa46652 SHA-1: 491ece989686fe2553e1641262e3bf9abeb605e8 SHA-256: 2f60bb5e3e5fe378b9710818ff90d57878f003c36222135eafcd88e2c12e03c5
174 Risk Score

Malware Insights

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

The file is an RTF document containing an OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is activated. The presence of the ".bin" file suggests a potential second-stage payload delivery. The document body is heavily obfuscated and does not provide clear user-facing content, reinforcing the exploit-driven nature of the attack.

Heuristics 4

  • 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
  • \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_off0000148f.bin
a0baa9ce85c72991c73e34aeb2eda43da51a01267de7d64a442af716785d22bf
rtf-objdata-decoded RTF \objdata at offset 0x148F 64052 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.93, consistent with packed or encrypted content.