Malicious RTF — malware analysis report

Static analysis result for SHA-256 7b894d774bf391f6…

MALICIOUS

RTF

24.1 KB First seen: 2023-08-08
MD5: 3823b7a10c3bbe3661e9513439ae092b SHA-1: 7405b1b66561d98f76937552a7b5043803233505 SHA-256: 7b894d774bf391f6a133e0f8901e0807ef75996cea19e865efee1f804bc300e3
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an RTF document that contains an embedded OLE object, specifically targeting a vulnerability in the Equation Editor. The `RTF_OBJUPDATE` heuristic indicates that the object is set to activate automatically upon opening. This suggests the file is designed to exploit the Equation Editor vulnerability to achieve code execution, likely for downloading and executing a subsequent stage. No document body text or scripts were extracted, limiting further analysis of the payload.

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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001b6a.bin
31bc0b16fe1abfd4de1d56a37ab139817a9968d9d39a1ce44d6baad8fe9d0ecd		 rtf-objdata-decoded RTF \objdata at offset 0x1B6A 1504 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.