Malicious RTF — malware analysis report

Static analysis result for SHA-256 985d629ba05f327a…

MALICIOUS

RTF

1.17 MB
MD5: 2e7059f95ce61a816102be30d14469d3 SHA-1: c844040f0de4672549bacffc9c7cf66adeeb7d79 SHA-256: 985d629ba05f327a50c00cda7d53130dd80539630a67270a3a5e13d16cb5d903
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). This exploit is known to allow for arbitrary code execution upon opening the document. No further stages or specific IOCs were identified in the static analysis.

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_off00000f58.bin
217afac0d9f62dec9fbeef9a3697cb517c9007906ff1b7a99a61a58a72acfcb6		 rtf-objdata-decoded RTF \objdata at offset 0xF58 52779 bytes
objdata_01_off0002e1cd.bin
d58e45cc3a60ce012b53972ea70846c80b4219924e4d59541626e9dbb3083e1d		 rtf-objdata-decoded RTF \objdata at offset 0x2E1CD 254566 bytes

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