Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e22bbf947e8edf9c…

MALICIOUS

RTF / .DOC

113.2 KB First seen: 2023-01-16
MD5: 28527cc18896bf1aa7cd70f4f332e075 SHA-1: 802646cc50089f135f1d404fbfb4d0018d2f9dde SHA-256: e22bbf947e8edf9c8df9e8fe8cf7101c271d29c0c68e3539acb21a7d17253f68
100 Risk Score

Malware Insights

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

The RTF document contains OLE object data and uses \objupdate to force activation, indicating an attempt to exploit OLE vulnerabilities. The presence of RTF_OLE10NATIVE_STREAM further suggests embedded malicious content within the OLE object. While no specific payload or script was directly extracted, the heuristics strongly point towards a malicious RTF dropper designed to execute embedded content.

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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001bdc.bin
69ad14cd38dfb9350db9f02cc8cc68d3b0ef5b1e2b7685826f5d2f48c8b7210e
rtf-objdata-decoded RTF \objdata at offset 0x1BDC 4165 bytes