Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0f80cf929264e963…

MALICIOUS

RTF / .DOC

1.95 MB
MD5: 04433286f1476d8fff5adf94c2af0ab3 SHA-1: e2bb476a767eeaa04aa5fd57905eeb0f9de66d71 SHA-256: 0f80cf929264e963c8822105f9f53498c903d18029a121b7dccef48cfbd332d0
180 Risk Score

Malware Insights

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

The file is an RTF document that contains embedded OLE objects, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates the document is designed to exploit this known vulnerability for code execution. The embedded object likely contains a secondary payload or script, as suggested by the RTF_OBJDATA and RTF_OBJEMB firings.

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_off00001116.bin
20d2c121ed085a8cfbcd06b5aedd2d22ae23ad46aadc4eb8901ba657a4d8bb32		 rtf-objdata-decoded RTF \objdata at offset 0x1116 25610 bytes
objdata_01_off000191f3.bin
0a68d9e39a239498edad4769b15ebffc3a7aacdb0159a7082c9c85b289bc5fc1		 rtf-objdata-decoded RTF \objdata at offset 0x191F3 462273 bytes

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