Malicious RTF — malware analysis report

Static analysis result for SHA-256 08d6bfb3f6015113…

MALICIOUS

RTF

161.5 KB
MD5: 9b4b2040a7e979ef48cda803b17efccc SHA-1: 75986e79f26608e3df20abf76bbb491b56da93a9 SHA-256: 08d6bfb3f6015113e7635af07e0fc4f6616e90e45580768b7e2cb043f028785f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object, indicated by RTF_OBJDATA and RTF_OLE10NATIVE_STREAM heuristics. The RTF_OBJUPDATE heuristic suggests that this object is designed to be activated automatically, likely leading to the execution of a malicious payload. The embedded artifact 'objdata_00_off000018e2.bin' is a high-entropy carved artifact, further suggesting malicious content. The attack pattern is consistent with a spearphishing attachment delivering a malicious OLE object.

Heuristics 4

  • 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.
  • \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_off000018e2.bin
4f5bbd5a285734725cd3185f9033a7bc44c85be3c8dbd55b679f6f4b4767ce17
rtf-objdata-decoded RTF \objdata at offset 0x18E2 63563 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.94, consistent with packed or encrypted content.