Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e2c5f53410160fd3…

MALICIOUS

RTF / .DOC

14.4 KB First seen: 2023-06-10
MD5: e7428573586ba4b5d2e04216ac4df9af SHA-1: 8f5cab6b0c7202e4d9e8fe27788b83f2f20eb2a4 SHA-256: e2c5f53410160fd3db58100b34460f6056dac73171d5bdeee81fd293a885f327
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains OLE object data and an embedded OLE object, specifically triggering the RTF_EQUATION_EDITOR heuristic. The ".objupdate" directive forces OLE activation, indicating an attempt to exploit the Equation Editor vulnerability. This suggests the file is designed to execute arbitrary code, likely downloading a secondary payload.

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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000166e.bin
96b1a2699c6aa9eedd14add14138ad357c9081eadbf1cd1826f5bfd616eae44b		 rtf-objdata-decoded RTF \objdata at offset 0x166E 1992 bytes

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