Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c96c560aae3440a7…

MALICIOUS

RTF / .DOC

3.7 KB
MD5: 3eb0e2234cfe50bb4e1be9500a1b92b7 SHA-1: 757aafc1cd09989ee06bd8f9426dea995cdadf9c SHA-256: c96c560aae3440a7681d24fa53a296c695392ca8edb35043430c383efcd69190
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The presence of RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED heuristics confirms the exploitation of this known vulnerability. The extasciitilde{}objupdate directive forces OLE activation, leading to arbitrary code execution. No document body text was available for analysis, but the heuristics strongly indicate a malicious exploit 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 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_off000000c4.bin
dde087d0dde141db021b8ca199ece7b68417f0d8301d3dbd2d098423b5e3dcc2		 rtf-objdata-decoded RTF \objdata at offset 0xC4 1605 bytes

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