Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 aa20d50ebffead14…

MALICIOUS

RTF / .DOC

2.20 MB
MD5: fdb1f88b81ddb8476f83416e59529a6d SHA-1: 80ae3ea26d6fa5ddd6aeac07adf42a838997f44f SHA-256: aa20d50ebffead148c07fd2e7c5dbf77419631afdef5047ef966bcf1987b2f0a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This exploit allows for arbitrary code execution upon activation, likely to download and run a secondary payload. The presence of multiple OLE objects and the critical Equation Editor heuristic strongly indicate this attack vector.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000011e1.bin
26e97a3521737f9864236ff31c290bb5064e519defcd2398ea23aa0b86b9e9be		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 47757 bytes
objdata_01_off0002ae96.bin
1dff60c32303d58fd426d1215689e547377c88210d425e277a4a202bc2e03050		 rtf-objdata-decoded RTF \objdata at offset 0x2AE96 543771 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.