Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e71ab923fe15bad4…

MALICIOUS

RTF / .DOC

4.2 KB First seen: 2022-03-23
MD5: 70aa23b2395cc26c53bd27f59b92526a SHA-1: 3dc5defdf418d9ec6aba235d4a5fa436784fae97 SHA-256: e71ab923fe15bad426b5edeaf8d43510c021d9c97d5e70c573ef5090bbff1a02
121 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.002 Component Object Model Hijacking

The RTF document contains embedded OLE objects, specifically triggering the Equation Editor vulnerability. The presence of `RTF_EQUATION_EDITOR` and `RTF_OBJUPDATE` heuristics indicates that the document is designed to exploit this vulnerability upon opening, likely leading to arbitrary code execution. No document body text or scripts were extracted, but the heuristics strongly suggest a classic Equation Editor exploit.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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_off000000b4.bin
80eeea466117761105510076c32bed36e25eb17d1002681c45ab1291cd2c486f
rtf-objdata-decoded RTF \objdata at offset 0xB4 1905 bytes