Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 fba4428a818227e1…

MALICIOUS

RTF / .DOC

158.5 KB
MD5: ab9ef97fd4b7cafc5c5e680f89e9265a SHA-1: 3535020d9d7c0cddc5385b222d0b89e7df719190 SHA-256: fba4428a818227e137156fa9145277594c123a571aa16ae4ab3a1b109bcddef4
147 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The RTF document contains OLE object data and is configured to automatically update and activate these objects, indicating an attempt to exploit vulnerabilities. The presence of `RTF_OBJAUTLINK` and `RTF_OBJUPDATE` heuristics strongly suggests that embedded content is intended for automatic execution upon opening. While no specific malware family is identified, the technique points towards a downloader or exploit delivery mechanism.

Heuristics 4

  • 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_off000007e5.bin
e98e3c03ae74f87b8cbc70df9deaeac8eb5d36614c895b47db6cf2a455dc8275
rtf-objdata-decoded RTF \objdata at offset 0x7E5 64049 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.93, consistent with packed or encrypted content.