Malicious RTF — malware analysis report

Static analysis result for SHA-256 bf0d4b06a6610740…

MALICIOUS

RTF

2.9 KB First seen: 2018-10-09
MD5: d3ce6330656da3c5a51a2d99ca02e0b1 SHA-1: 6613074008c4b39058bc307037b14e082999dbea SHA-256: bf0d4b06a6610740e5414f96ae0c48e0ef0a9303c53da49d94b7605958dee6b3
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and triggers heuristics related to Equation Editor exploitation. The critical RTF_EQUATION_EDITOR heuristic indicates a known vulnerability exploitation, likely for client execution. The ".objupdate" heuristic suggests the embedded object is activated, leading to code execution. Given the nature of the exploit, it is highly probable that this file is delivered as a spearphishing attachment intended to download and execute a secondary payload.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical CVE likely 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_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 1451 bytes
SHA-256: 7d488e7e194cca6c2ec32f66708c245982f60fa72a37a4c6b744ba235acc6aa1

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