Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0c5704edd32b5754…

MALICIOUS

RTF / .DOC

2.09 MB
MD5: 66c72e808d6803f22fcd6ec419a6f039 SHA-1: 0ac316f9fd8f6b3d8cfd05924f2c3704df112df7 SHA-256: 0c5704edd32b5754f2caf5a45caef11e0fa1a9381c84b05f391b9b8d1c101a3a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This exploit is used to execute arbitrary code, likely by activating the embedded OLE object. The presence of ".vbs" in the decoded object data suggests a Visual Basic script is involved in the payload 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_off00001202.bin
8ec12cc6f4bf42f8c52d29a151da6d8e25b1840545e9ba0d5c3e0b66a995e2b1		 rtf-objdata-decoded RTF \objdata at offset 0x1202 27321 bytes
objdata_01_off0001cf7f.bin
53b9f303d393dc929d79a2b5c8f4ddab6c91c8bfe1e80e0ffc1a4d210ef1046d		 rtf-objdata-decoded RTF \objdata at offset 0x1CF7F 362344 bytes

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