Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 f73c305a30ff0153…

MALICIOUS

RTF / .DOC

631.3 KB
MD5: 02f8946d106c9da4187129f2eb0278b9 SHA-1: b9fed8b99b334c1b0062093bfb42eb62e2d8e562 SHA-256: f73c305a30ff01530c49c735e5c3b92b38248ecab0355b60d7e6e61eaebd398b
129 Risk Score

Malware Insights

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

The sample is an RTF document containing OLE object data, specifically triggering critical heuristics for Equation Editor vulnerabilities and OLE object activation. This strongly suggests the document is designed to exploit these components to execute arbitrary code. The embedded artifact, objdata_00_off000007da.bin, is likely the payload or a component thereof. The lack of readable document body text or scripts means the exact nature of the payload cannot be determined, but the exploit vector is clear.

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_off000007da.bin
a5495da66a231d33b48ce143c19b6ede38c0e83d150fd6fe9c5a886b45f72b9d
rtf-objdata-decoded RTF \objdata at offset 0x7DA 129077 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.