Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3b2e2e319f86325c…

MALICIOUS

RTF / .DOC

14.9 KB
MD5: e0ea22de514567418f86a8437b2a5830 SHA-1: f56e5224cfb58a8a02ab418bc5708e059bde41d0 SHA-256: 3b2e2e319f86325c0a5ff10ef3a5df47e0720ada2bc8b7531a356928ecd544c7
240 Risk Score

Malware Insights

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

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). The heuristic 'CVE_2017_11882_ACTIVATION_RELATED' specifically indicates this exploit. The embedded object is activated via \objupdate, forcing the execution of the exploit. The decoded object's class is 'equatIoN.3', which is a strong indicator of this specific vulnerability being targeted. The primary attack pattern is the exploitation of this known vulnerability to achieve arbitrary code execution, likely leading to the download of a secondary payload.

Heuristics 6

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • ClamAV: Rtf.Malware.Agent-9913102-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Malware.Agent-9913102-0
  • \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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000ce8.bin
a6b82912d18ffafff7dbcf4f8aee3085f5b01b8fdd39bab3008f95f9b48e9ff3		 rtf-objdata-decoded RTF \objdata at offset 0xCE8 1570 bytes

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