Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 45eb17777713f64f…

MALICIOUS

RTF / .DOC

2.26 MB
MD5: 06739b59943ba8ed035d0eb2209f78dd SHA-1: 056d7b12717f28846f784e95a64099b0000b77fb SHA-256: 45eb17777713f64fd40ad6db20d3c4929f9b4a4c42b686d66c9d03c6f44b4f30
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1559.001 Component Object Model Hijacking

The RTF document contains embedded OLE objects and specifically triggers the CVE-2017-11882 vulnerability through the Equation Editor. The `RTF_EQUATION_EDITOR` and `CVE_2017_11882_ACTIVATION_RELATED` heuristics confirm this exploit. The ` tfobjupdate` forces OLE activation, leading to the execution of the embedded malicious content, likely a second-stage 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001202.bin
9ff0e23cbb5fbf2590e89d4c22c3e1b19faac2d0ece8a2353d116b0d6609026f		 rtf-objdata-decoded RTF \objdata at offset 0x1202 27610 bytes
objdata_01_off0001d1c1.bin
7b044241719dc498d7192da41c089b65b5b58d1276cabad9af124a69d1f89421		 rtf-objdata-decoded RTF \objdata at offset 0x1D1C1 483334 bytes

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