Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e3c621f5bedd0fd8…

MALICIOUS

RTF / .DOC

4.0 KB
MD5: b5b063ddc9f082c248b91899eee3ddf9 SHA-1: 824e308d49cdfdb3cbf7f086ea9c79a492e8d889 SHA-256: e3c621f5bedd0fd8525f89d264306c939295696234a6042b3d882f507493de9c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object specifically identified as related to Equation Editor, triggering heuristics for CVE-2017-11882. The presence of \objupdate indicates that the OLE object is forced to activate, which is a known technique for exploiting this vulnerability. This exploit allows for arbitrary code execution, likely to download and run a secondary payload.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000007a.bin
f0579c32f171bb92ebbf3eaa840385f6a24357992a7732dd9a2560c9e6999b2c		 rtf-objdata-decoded RTF \objdata at offset 0x7A 1793 bytes

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