Malicious RTF — malware analysis report

Static analysis result for SHA-256 080ff497053afc35…

MALICIOUS

RTF

1.74 MB
MD5: 231a88bf64fd66c028d08c0cdc8f43aa SHA-1: 201fa4f476524e570b10c8200ef366d0c1898391 SHA-256: 080ff497053afc3572c25a253f3f7e58b55acb342a307382d6649f2eaf849891
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This exploit is designed to execute arbitrary code, likely a second-stage payload. The presence of ".vbs" in the decoded object data suggests the execution of a Visual Basic script.

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_off00001269.bin
1c901d91c64e1d3710e2e6467ad8a4ca25d0cbb2b92071709b5ee182e8d1a28b		 rtf-objdata-decoded RTF \objdata at offset 0x1269 12587 bytes
objdata_01_off000085e7.bin
6d28451bfba9316142616b26bc47ebba4067443186b58b91e5ed1e7a273e3b83		 rtf-objdata-decoded RTF \objdata at offset 0x85E7 322634 bytes

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