Malicious RTF — malware analysis report

Static analysis result for SHA-256 3645dc1262630179…

MALICIOUS

RTF

791.2 KB Created: 2018-04-18 02:14:00 First seen: 2019-06-27
MD5: 6df91f880dcfc6ab1827376fd8b45f49 SHA-1: 080135c5d6b272e0e276dff4abdb93b9e622b790 SHA-256: 3645dc1262630179056ab83e79210fec695395493c754ffdf3aa96d71b466a19
142 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects and uses \objupdate to force their activation. The critical heuristic firing for CVE-2017-8759 indicates exploitation of MSXML SAX OLE activation, a known vulnerability used to download and execute arbitrary code. The embedded URL, though incomplete, likely points to a malicious resource. The file's purpose is to exploit this vulnerability to achieve initial execution.

Heuristics 5

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • \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 10 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.mi In RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002cbf.bin rtf-objdata-decoded RTF \objdata at offset 0x2CBF 26171 bytes
SHA-256: a655fa273d85bc4bab03f02b304e00000a4aa0898e95fe0bd02521fe27295679
objdata_01_off000158dc.bin rtf-objdata-decoded RTF \objdata at offset 0x158DC 26171 bytes
SHA-256: 41e30ede73717f742a53f3142c5e114be79d3001b44130bbffc9c32ad429fba2
objdata_02_off000284f9.bin rtf-objdata-decoded RTF \objdata at offset 0x284F9 26171 bytes
SHA-256: 917232181501f9bc84fe50f64d98433c3062ccc929a9fdf07548949585170311
objdata_03_off0003b116.bin rtf-objdata-decoded RTF \objdata at offset 0x3B116 26171 bytes
SHA-256: 6ebbe9be83627712b6628dd3ca0f7910f0fb15cf8fe7d4a96908262fd2f3c729
objdata_04_off0004dd33.bin rtf-objdata-decoded RTF \objdata at offset 0x4DD33 26171 bytes
SHA-256: 5e0d847867dc029aec1072170266997af7fa845c6f3318281309cecacb84efa8
objdata_05_off0006099c.bin rtf-objdata-decoded RTF \objdata at offset 0x6099C 26171 bytes
SHA-256: 28ab186f236a6df4d8a788e1846ea0653602d9223c5178daee3d23fdabbad9f9
objdata_06_off000735b9.bin rtf-objdata-decoded RTF \objdata at offset 0x735B9 26171 bytes
SHA-256: e9050abb373b116fecb762347388ca15c0625e40717542bdd2dfe8cc4163e0da
objdata_07_off000861d6.bin rtf-objdata-decoded RTF \objdata at offset 0x861D6 26171 bytes
SHA-256: a09d7a8e9c6eaf79940943c3bdc3edaeaffe12171e5b50f6e243b2c05459e42f
objdata_08_off00098df3.bin rtf-objdata-decoded RTF \objdata at offset 0x98DF3 26171 bytes
SHA-256: f6ee796287fc420d8f0afe3580909edbef7961ff0c0bd60b303b2843121999ee
objdata_09_off000aba10.bin rtf-objdata-decoded RTF \objdata at offset 0xABA10 26171 bytes
SHA-256: ea4a83042bb1b800c486df446ee6b9a2db5176396efe82ae81020b6f3d3ae84f

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