Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c796080f9c704855…

MALICIOUS

RTF / .DOC

2.21 MB
MD5: 150261328c9acaecc66968ae0efd37ee SHA-1: 19eeff6bfc783323a85950682958f5e006c5b0e8 SHA-256: c796080f9c704855e94c27f3126628cc1434b252ae6a8168de81865d7e4eb20a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability through an embedded Equation Editor OLE object. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of OLE object data and specific Equation Editor-related heuristics strongly indicates this exploit vector.

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
82d0f7bd037e185282ce931500c06fb23b85facbad759d7281a84683a7b55129		 rtf-objdata-decoded RTF \objdata at offset 0x1116 26852 bytes
objdata_01_off0001c69d.bin
fe43efbadd674765243cb2580d9955cd54bcbea3b2eb0d6d648fe532cb7ef883		 rtf-objdata-decoded RTF \objdata at offset 0x1C69D 476202 bytes

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