Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 82fd9e906979a54a…

MALICIOUS

RTF / .DOC

2.14 MB
MD5: 044240be9a10909fe16659868b1e7d62 SHA-1: 6761b6879de9f607b6b148a18291383aac6ad048 SHA-256: 82fd9e906979a54a687422b5bc8f310b4eff4c44c0383999f4383f8e8689a9d8
180 Risk Score

Malware Insights

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

The sample is an RTF document that contains embedded OLE objects, specifically triggering the CVE-2017-11882 Equation Editor vulnerability. This exploit is known to be used for arbitrary code execution, indicating the document's purpose is to deliver a secondary payload. The presence of `Equation.3` as a ProgID is a strong indicator of this specific exploit.

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_off000011e1.bin
82dae86fd277396ef205cf7abd0d45721d712f5a223199003e7dc0e37d4831f1		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 28728 bytes
objdata_01_off00019583.bin
c871b0ddd22fecfdd6e974f8c3ec280f048875d55c366cef5086c24bb2763af3		 rtf-objdata-decoded RTF \objdata at offset 0x19583 546134 bytes

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