Malicious RTF — malware analysis report

Static analysis result for SHA-256 c9c4ee34d9c9f769…

MALICIOUS

RTF

4.2 KB First seen: 2023-01-18
MD5: d43c01d0e68343c29a5eb5cb96c5fa58 SHA-1: b07e47e2e2e33caf1dc1cef77cbe5325ab195e53 SHA-256: c9c4ee34d9c9f769f884f720e1d37ce1e864aae1be81a4a274bb1a88704cb11c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains OLE object data specifically related to the Equation Editor, triggering heuristics for CVE-2017-11882. The presence of ` 8595195haga clic en el ícono de habilitar edición arriba si el documento permanece en blanco ` suggests a lure to trick the user into enabling content, which would then trigger the exploit. The exploit allows for arbitrary code execution, likely to download and run a secondary payload.

Heuristics 5

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • \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_off000000e2.bin
06761c3ea7b25729352e8adf5653eae9d07680d72eed143278d829e74616637d		 rtf-objdata-decoded RTF \objdata at offset 0xE2 1994 bytes

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