Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 46681ef5502ead88…

MALICIOUS

RTF / .DOC

1.39 MB
MD5: 688db49fed7e67ac094418e5d650ea6d SHA-1: 8d3848973c1bcfc04bc8792269a019a3336ee22f SHA-256: 46681ef5502ead8800d36880d4852494d4e5f93278b1b86a2165e8f0783ad4b8
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document containing embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Microsoft Equation Editor. This exploit allows for arbitrary code execution upon opening the document. No specific malware family was identified, but the exploit mechanism is clear.

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
51fb2f6ff1b2b97b515bc7a934a4a8230712a038673657e91c62d128fde122da		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 53361 bytes
objdata_01_off0002ed33.bin
5d913e0bdd4543b59117490fda1dba3c38edbcd2b81c5376d07402a696f7c2ab		 rtf-objdata-decoded RTF \objdata at offset 0x2ED33 346025 bytes

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