Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e1f8d8b54b8cf3cf…

MALICIOUS

RTF / .DOC

1.94 MB First seen: 2022-04-14
MD5: 3b7a3523053b18035c2e30f294d098f8 SHA-1: cbff678927de535387e2b13127e7c8073ca73f30 SHA-256: e1f8d8b54b8cf3cfc162b47d70508ac41ad30e2318a9eb69764da10e1f888185
340 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

The file is an RTF document containing embedded OLE objects, specifically triggering heuristics related to Equation Editor vulnerabilities (CVE-2018-0802). The presence of large hex-encoded data blocks within the OLE object suggests the hiding of a payload. ClamAV detection confirms this as Rtf.Exploit.CVE_2018_0802-6825822-0, indicating a likely exploit attempt to execute arbitrary code.

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_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • 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 ~2027KB 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_off0000178a.bin
5f64316b49d934b245b9a62290daff4a6492ae97b392cdb156a1f9e692868974		 rtf-objdata-decoded RTF \objdata at offset 0x178A 1013825 bytes

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