Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3f0e13b32ba40d6a…

MALICIOUS

RTF / .DOC

20.3 KB
MD5: db762da6e399bc9afb3a9c0ef2861cf8 SHA-1: d928f07b05fc6d29dd47e1fc1c4681b7bee63ce8 SHA-256: 3f0e13b32ba40d6a8f58e08e79ec003e1cf8cc79946ecb0fda8a67233b2b5935
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The presence of RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED heuristics strongly indicates this exploit. The extasciitilde{}objupdate directive forces the OLE object to activate, leading to arbitrary code execution. No document body or scripts were extracted, but the exploit itself is sufficient to classify the attack pattern.

Heuristics 5

  • 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.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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_off000019ff.bin
30ff5a28a9670b04c7cf9f02437af4a8c89d029c2618c1e820b62e01d39272fd		 rtf-objdata-decoded RTF \objdata at offset 0x19FF 1462 bytes

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