Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 8c7770784d988a7f…

MALICIOUS

RTF / .DOC

2.29 MB
MD5: 614dda84b940571de5b6439ab08dbfc7 SHA-1: 679463fa7922539375699c1306fa683b91321eb8 SHA-256: 8c7770784d988a7ff437a90b9d248ed803bf0de48569d636652c046fd1b90700
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an RTF document containing embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability via the Equation Editor. This indicates an attempt to exploit a known vulnerability for arbitrary code execution. The embedded object data and heuristics strongly suggest this exploit is present and active.

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_off00001116.bin
cac920d8726f809e397ae04cfe4faaee1833ff2315ec1b5c94b5d2a32a366ab3		 rtf-objdata-decoded RTF \objdata at offset 0x1116 41593 bytes
objdata_01_off0002dee1.bin
c1f3c723085fd87a0d81f66f4e3635cbdf2f49fa9687ff46a26b52918c9ec2b0		 rtf-objdata-decoded RTF \objdata at offset 0x2DEE1 478951 bytes

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