Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 df1fa70cbb3ccf5e…

MALICIOUS

RTF / .DOC

1.82 MB First seen: 2022-04-14
MD5: c70d317b9b5128fb06fb8e5799ba565d SHA-1: bbe56f70d3362a2d0edd046dc5c5b6477fe6d749 SHA-256: df1fa70cbb3ccf5e5ba8e95db170dacfd78c2929a5a347d1838d9d5b9df47b7b
300 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is an RTF document that contains embedded OLE object data, specifically triggering heuristics related to Equation Editor vulnerabilities (CVE-2018-0802). The presence of large hex-encoded data blocks and the ClamAV detection strongly indicate that this document is designed to exploit this vulnerability. The exploit likely leads to the download and execution of a secondary payload, although the specific mechanism is not detailed in the provided evidence.

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_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • \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 ~1905KB 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_off00000d1c.bin
9322bf7ecb04833a2a0b52473ec322b3946619d9c17addaa764670e704f59df2		 rtf-objdata-decoded RTF \objdata at offset 0xD1C 952914 bytes

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