Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 fe30cd33861d1994…

MALICIOUS

RTF / .DOC

1.60 MB First seen: 2022-03-28
MD5: 0fd4ae667fb6f92695b2b70c29d61b8e SHA-1: 5f28baef68ed6f721b344cd0896c6cc98fa0da0a SHA-256: fe30cd33861d199404bfe98540c403fe1c2730924b640fb52632d7ac13cf3fa3
340 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter

The file is an RTF document that contains embedded OLE objects, specifically leveraging the Equation Editor vulnerability (CVE-2017-11882). Heuristics indicate the presence of automatically linked OLE objects and excessive hex data, suggesting a hidden payload. ClamAV explicitly identifies this as Rtf.Exploit.CVE_2017_11882-6584355-1, confirming the exploit attempt.

Heuristics 8

  • 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
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 ~1670KB 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_off0000123d.bin
85cb2120bcd2ab854fe59f2d9006383409d0375c4cf7d9e588a306bcba5176c6		 rtf-objdata-decoded RTF \objdata at offset 0x123D 835154 bytes

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