Malicious RTF — malware analysis report

Static analysis result for SHA-256 24875e178c84a4a6…

MALICIOUS

RTF

82.0 KB First seen: 2024-07-06
MD5: 0028cb11338cbdfd81985d00fa9bf282 SHA-1: 5f5f182a5be7041178d8a1203a9d32259432bbd5 SHA-256: 24875e178c84a4a682474a8d81b4e1c795f56ba93a2916e56957d99ce4aa1745
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The RTF file contains an embedded OLE object and specifically targets the Equation Editor, indicated by the RTF_EQUATION_EDITOR heuristic. The ".objupdate" directive forces the activation of this OLE object, which is a known method for exploiting vulnerabilities like CVE-2017-11882. This exploit likely serves to download and execute a secondary payload, although no specific URLs or scripts were extracted to confirm the exact mechanism.

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_off00001940.bin
9a141a7f863ea47fce862fd4e2985885a76ef33ac765591dbe258fa458523668		 rtf-objdata-decoded RTF \objdata at offset 0x1940 1488 bytes

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