Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e53ffddd18c7018d…

MALICIOUS

RTF / .DOC

2.02 MB First seen: 2022-03-28
MD5: cd7b1eeaf412f69e6911601434361597 SHA-1: d8af5ed2a61f495c5bce1113c9f94d5e9cf1d930 SHA-256: e53ffddd18c7018daafe0212e017a54d788e1909cf0f81a47451dfde342230a8
300 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.001 PowerShell T1204.002 Malicious File

The file is an RTF document that contains embedded OLE objects, specifically triggering heuristics related to the Equation Editor vulnerability (CVE-2017-11882). The presence of large, hex-encoded data within OLE objects and the ClamAV detection signature 'Rtf.Exploit.CVE_2017_11882-6584355-1' strongly indicate exploitation of this known vulnerability. This exploit is designed to download and execute a secondary payload, likely leading to further system compromise.

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 ~2112KB 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_off00001242.bin
e418c4e35dd048bcb01a278b9516dc05f417505867b7498258b076a86d85d0cb		 rtf-objdata-decoded RTF \objdata at offset 0x1242 1056330 bytes

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