Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 95dbfa33af8d805f…

MALICIOUS

RTF / .DOC

34.5 KB First seen: 2023-04-20
MD5: 28c7aee6bfe15f9a4315593e0b5ab302 SHA-1: c1ee53a3f90c27c97b42f87d4f12b5ae1e4f6289 SHA-256: 95dbfa33af8d805f7fa3edac0252f43e8e6228f3362ed221159401f0d0bfa4d3
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File

The sample is an RTF document containing an embedded OLE object with a specific Equation Editor ProgID, indicating an attempt to exploit CVE-2017-11882. The \objupdate directive forces OLE activation, and the document body contains a lure instructing the user to 'Enable editing', which is a common technique to bypass macro security settings and trigger the exploit. No scripts were extracted, and the specific exploit target beyond Equation Editor is not detailed.

Heuristics 4

  • 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 1 \objdata section(s) — embedded OLE objects
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000482d.bin
06b4c3340eab47f16510d87a5adac588eae60b1b62e5ef3a5d7eed09a047c941
rtf-objdata-decoded RTF \objdata at offset 0x482D 1402 bytes