Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6ed3aca39d91726d…

MALICIOUS

RTF / .DOC

1.70 MB
MD5: 2fea7c43cd327113333de7ff54800979 SHA-1: b2cf7c97bbfec5b765ee9402f57440910ec89e8b SHA-256: 6ed3aca39d91726d1f16ecb2fa8fc5cc38fa4cce1355bfd5186d2a22769e806c
220 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data, specifically related to Microsoft Equation Editor, and triggers heuristics indicating exploitation of CVE-2017-11882. This vulnerability is commonly used to execute arbitrary code, likely to download and run a secondary malicious payload. The presence of RTF_OBJDATA and RTF_EXCESSIVE_HEX further suggests the embedding of a hidden payload within the OLE object.

Heuristics 5

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1778KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001d34.bin
204297e0229a42c16a60b7775574241e82641c0dd3f94542e1dd6dba25bf2fa2		 rtf-objdata-decoded RTF \objdata at offset 0x1D34 889169 bytes

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