Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 9b49b62977071085…

MALICIOUS

RTF / .DOC

503.4 KB
MD5: 7d995de95bebcc28ba69afcb8d4afdfe SHA-1: 7df24c2da47ceec2839d688a5a06cb1bff75c9bf SHA-256: 9b49b62977071085eebb17d9fd69c7b7bfbef857581b136fa365df00630ab7b1
184 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, indicated by multiple RTF_OBJDATA firings. The RTF_OBJUPDATE and RTF_OBJAUTLINK heuristics suggest that these objects are designed to be automatically activated upon opening the document, likely exploiting a vulnerability to execute arbitrary code. A high-entropy OLE object was extracted, named objdata_00_off00001852.bin, which is the primary indicator of the malicious payload.

Heuristics 5

  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • 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 2 \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_off00001852.bin
0e9b0d5bb2000ed510ed77d86241af255626a4aa89fcd1add4e250d88dd2cc61
rtf-objdata-decoded RTF \objdata at offset 0x1852 145473 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.