Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e38f7c2185f5acee…

MALICIOUS

RTF / .DOC

2.18 MB
MD5: 2b3e0d6debf5a0aeb964c6890c94ecdc SHA-1: 153f6bb85c6eb37d633279b8ceee88486d716759 SHA-256: e38f7c2185f5aceeeb7251c94f270c34b1d900b2c0301f87891fdcc6a2cc9bff
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The RTF document contains embedded OLE objects, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. The presence of ".objupdate" indicates that the embedded OLE object is forced to activate, leading to the exploitation of the Equation Editor vulnerability. This allows for 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000011e1.bin
9562116a3e37fa9240df724143bdd3168e5fbc8ed3a3d144db8dc0b1c96822c6		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 43149 bytes
objdata_01_off0002613b.bin
1dff60c32303d58fd426d1215689e547377c88210d425e277a4a202bc2e03050		 rtf-objdata-decoded RTF \objdata at offset 0x2613B 543771 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.