Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a967e2f5e1fc92a6…

MALICIOUS

RTF / .DOC

1.93 MB
MD5: 152438bb22e31363ad1d574d4df8a0ff SHA-1: a7cf4ff34f6c2dbcf5b9c7bd7eef6da41d274bbb SHA-256: a967e2f5e1fc92a6736067267d55f0a486607e08bc744f23f20a17149aa451dd
260 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 OLE object that is strongly indicative of the CVE-2017-11882 Equation Editor vulnerability. The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_RELATED` heuristics confirms this. The `RTF_OBJUPDATE` heuristic suggests that the embedded object is designed to be activated automatically, leading to the execution of a secondary payload. The large amount of hex-encoded data within the OLE object further supports the hiding of a malicious payload.

Heuristics 6

  • 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.
  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • 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 ~2024KB 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_off00000145.bin
1e86b39721122bfa3eb2a712141cc671d8ce868212539846617f449229c72d38		 rtf-objdata-decoded RTF \objdata at offset 0x145 1012361 bytes

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