Malicious RTF — malware analysis report

Static analysis result for SHA-256 c300d5f027ad2ff0…

MALICIOUS

RTF

9.9 KB
MD5: 6282f2cfbc7e8a2bbecb1561130dd074 SHA-1: 712c0de0953eb3125c39ab621b998bed9600e65d SHA-256: c300d5f027ad2ff03955c0a7cab0ac88830a2fbf088cb44ec0a3298a84964d87
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF document contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of ".\objupdate" further indicates that the OLE object is configured to activate automatically upon opening the document.

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 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_off0000103e.bin
213c042e43b51075ea17b35b316af92a2dfb31c41240ca6c1671ab2d160db72f		 rtf-objdata-decoded RTF \objdata at offset 0x103E 1850 bytes

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