Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b1661509c1f6d349…

MALICIOUS

RTF / .DOC

1.82 MB
MD5: 1f24b719c9d1f0b506b1f211173f6f2c SHA-1: 10544e10cc348e4d652bc6b6cb8c681e04dea603 SHA-256: b1661509c1f6d349fa8836e02c84d011ade1b30fe84a8bbfb80fd400c77cbb35
300 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains embedded OLE object data, specifically triggering heuristics related to Equation Editor and OLE activation. The critical ClamAV detection explicitly identifies the CVE-2017-11882 vulnerability, commonly exploited via Microsoft Equation Editor. This suggests the file is designed to deliver a payload by exploiting this known vulnerability for client execution.

Heuristics 7

  • 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.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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 ~1902KB 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_off00000093.bin
8b1e4fa5a4a98468be8ecf1f702d80acb2fdcb30d5133885463375f9605fd02f		 rtf-objdata-decoded RTF \objdata at offset 0x93 951380 bytes

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