Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 fde845dc869db03c…

MALICIOUS

RTF / .DOC

2.10 MB
MD5: ae01f0cc63c8a3b7bb239976c56788c3 SHA-1: cd86bb62ab645cab4d20ec8a931ca9e84801ea36 SHA-256: fde845dc869db03ce766a34d4d325cfb60ea5e605244e823fcfea5b3135aacb7
300 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.001 PowerShell T1566 Phishing T1566.001 Spearphishing Attachment

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code upon opening the document. The presence of excessive hex data within the OLE object suggests a hidden payload. The ClamAV detection explicitly names this exploit.

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 ~2150KB 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_off000000b2.bin
ab4c54f64f1434f097073dacc3e13ccbb2d9229fdc8c719da7c837d966f9fa00		 rtf-objdata-decoded RTF \objdata at offset 0xB2 1081331 bytes

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