Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c5a61d5f8a5684fb…

MALICIOUS

RTF / .DOC

20.5 KB First seen: 2022-08-18
MD5: 4d91b9ed1df182c16718699d2cd1a243 SHA-1: 2d8214161b7f26617dbb4efa1ded7ada0b09c614 SHA-256: c5a61d5f8a5684fb7e267e4ff68a122f98be4b2d603cfdf8671cbc2a2c4a4826
100 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects that are triggered via \objupdate, indicating an attempt to execute arbitrary code. The presence of OLE object data and the \objupdate heuristic strongly suggest that the file is designed to exploit this mechanism for malicious purposes, likely to download and execute a secondary payload.

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_off00001433.bin
08d1904a54fa02467aef59766d53fcacb8262ece7deb6b4b0b9381f49a2fc3a5
rtf-objdata-decoded RTF \objdata at offset 0x1433 4291 bytes