Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 db5f27e6de5dba4c…

MALICIOUS

RTF / .DOC

50.1 KB First seen: 2023-02-24
MD5: d0e99d9fb94fe4ecc40cfca19024fb2e SHA-1: 8eed3c04abffb630b15e08af69c7a3a1303a16a5 SHA-256: db5f27e6de5dba4c8b2204f73e1c9b0b731a61e0b1f98694c80a128c327bc37c
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1059.005 Visual Basic

The sample exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor, as indicated by the RTF_OBJDATA and CVE_2017_11882 heuristics. The document body contains a lure to enable content, suggesting it's a dropper designed to bypass security measures and execute a payload. No specific family could be identified.

Heuristics 4

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • \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_off000018c5.bin
0e28ca4880fc72937359abf61e9ac0c4ddb74af5f2192f33baa2d59c87bc7b1e
rtf-objdata-decoded RTF \objdata at offset 0x18C5 3138 bytes