Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b7c7749973d2896a…

MALICIOUS

RTF / .DOC

38.4 KB
MD5: 1e97d1f8c9f30308ba74d14f9b47a0ce SHA-1: 0bb727743bab01893b705f648f433173239eb650 SHA-256: b7c7749973d2896ad809e3327ad6657131c3444282dd261d5fe9f7c2bfd9c220
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1105 System Information Discovery

The file exhibits multiple indicators of an Equation Editor exploit, specifically utilizing the extit{objdata}, extit{objemb}, extit{objupdate} and extit{equation_editor} RTF controls to activate the vulnerable Equation Editor component. The presence of the CVE-2017-11882 related object and the forced OLE activation strongly suggest the intent is to trigger a vulnerability, likely for downloading and executing a secondary payload. The document's structure and the embedded Equation Editor object are consistent with known Equation Editor exploit documents.

Heuristics 5

  • 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.
  • 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 2 \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_off00001b86.bin
2eab6e96762e0a8e93e50c7cca424131169dee8c0894cdce668ea3b11985e05f		 rtf-objdata-decoded RTF \objdata at offset 0x1B86 1942 bytes

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