Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 9372d4579b0eb33b…

MALICIOUS

RTF / .DOC

16.7 KB
MD5: 53b2f71c3200d92f0164faac5485173e SHA-1: 8d030de23ab0496adbb2f5ee979b508ee122f04f SHA-256: 9372d4579b0eb33be8eff547f11b719d145eb5e0bccf7104b45da13fd46c3a09
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.002 Component Object Model Hijacking

The RTF document contains an embedded OLE object, specifically identified as related to Equation Editor and triggering the CVE-2017-11882 vulnerability. The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_ACTIVATION_RELATED` heuristics strongly indicates exploitation of this known Microsoft Office vulnerability. The `RTF_OBJUPDATE` heuristic further suggests that the embedded object is designed to be activated automatically, leading to arbitrary code execution.

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_off000007a3.bin
09843c173523d535189c79755d6c9217f03bec3b3fe5ed39954cdf564a8577e9		 rtf-objdata-decoded RTF \objdata at offset 0x7A3 1429 bytes

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