Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b91e355b44d51cfd…

MALICIOUS

RTF / .DOC

38.0 KB
MD5: 4b0e79390bc35fae871c94f0b1ad75b8 SHA-1: aeb481be1c9c923e4b29595112da50e3bf13be73 SHA-256: b91e355b44d51cfd622d8fb1e1b53959a1855635d28e35df88ba135ea49f69bb
100 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 triggers OLE activation, indicating it's designed to embed and execute external content. The heuristics RTF_OBJDATA, RTF_OBJUPDATE, and RTF_OLE10NATIVE_STREAM strongly suggest that the document is a lure intended to trick the user into activating an embedded OLE object, which in turn likely downloads and executes a second-stage payload. The document body is heavily obfuscated and does not provide clear textual clues about its intent.

Heuristics 3

  • 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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001ffe.bin
142a46e9395e3df332df8b9e28b68fd31e917cdfa829491db3bfe31587b7888c
rtf-objdata-decoded RTF \objdata at offset 0x1FFE 4683 bytes