Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d3f09510d79948e7…

MALICIOUS

RTF / .DOC

1.71 MB First seen: 2022-03-21
MD5: 08da6491107a04a444a28c9e698a7508 SHA-1: 13845997906a0656f742bf55470af800d16e3aa4 SHA-256: d3f09510d79948e74b873e0296f48e2bf095f8e015f96424942ee6b1742c27ab
300 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document that contains embedded OLE object data, specifically triggering heuristics related to the Equation Editor vulnerability (CVE-2017-11882). ClamAV also explicitly detected this known exploit. The large amount of hex-encoded data within the OLE object suggests it is used to hide a payload. The attack pattern involves luring the user to open the document, which then exploits the Equation Editor vulnerability to execute a malicious payload.

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 ~1786KB 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_off00001f2e.bin
5d50efde4ebc07cd47b651f7efdbc3e7dea7af5b00cec8bd6e434ca62a1bd48f		 rtf-objdata-decoded RTF \objdata at offset 0x1F2E 893497 bytes

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