Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6be05744bb988c29…

MALICIOUS

RTF / .DOC

1.01 MB
MD5: 4963c2b79bb3d8377f4fd733027394b1 SHA-1: 0531f1105c9833d3781e31739376cecec5af3ef6 SHA-256: 6be05744bb988c292d9de6d080efac94f23e802e05e865672d3b285112cee48a
180 Risk Score

Malware Insights

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

The sample is an RTF document containing embedded OLE objects, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this known vulnerability for arbitrary code execution. The embedded data appears to be obfuscated script-like content, likely part of the exploit chain.

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_off00000f58.bin
287fc92f61029c54b2d5af23c63544f941e93086f6c5755cc639f450faa473af		 rtf-objdata-decoded RTF \objdata at offset 0xF58 48997 bytes
objdata_01_off0002a9d1.bin
faaa23976e44b1147dfaf4bfbddc4554674728770dee43f10bab0d524243535b		 rtf-objdata-decoded RTF \objdata at offset 0x2A9D1 217076 bytes

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