Malicious RTF — malware analysis report

Static analysis result for SHA-256 fc67c18043a4c423…

MALICIOUS

RTF

8.2 KB First seen: 2020-02-04
MD5: b9c011303fce33699fc868354d5a8e61 SHA-1: f80b448b70bbbf36d5ae4c903071ab4876b93e1f SHA-256: fc67c18043a4c4231eada3737b612f93e79007b7fc55922166b22f73e52742de
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data, specifically triggering heuristics related to Equation Editor exploitation. The presence of \objupdate further indicates an attempt to force the activation of this embedded object, likely to execute a malicious payload. This pattern is consistent with exploiting vulnerabilities like CVE-2017-11882 for client execution.

Heuristics 4

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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_off00000032.bin rtf-objdata-decoded RTF \objdata at offset 0x32 4149 bytes
SHA-256: 48776f8d6af5076072caa9ed29fda2a5b64093de0ac6c3900609a9a098c91ae9

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