Malicious RTF — malware analysis report

Static analysis result for SHA-256 b3f00d255dc51c19…

MALICIOUS

RTF

950.5 KB Created: 2018-04-18 01:52:00 First seen: 2018-04-30
MD5: 6101070473d96f772928247a823dd17c SHA-1: 27b450d77c0314736eddb6ff5f96535183791f02 SHA-256: b3f00d255dc51c19ae78b7f7a07c8c18ae911723690517507531e168216f05f3
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 12 \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 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002cb7.bin rtf-objdata-decoded RTF \objdata at offset 0x2CB7 26683 bytes
SHA-256: 25de41c6ae20e4e990c75e2197abc09816c09dd2bd9628b21f99451f1f9b5797
objdata_01_off00015752.bin rtf-objdata-decoded RTF \objdata at offset 0x15752 26683 bytes
SHA-256: 91d3c31e5e7e8cac6dcdb60d3bb1a5b8a4f31a0c36ebabcdb65d5c5e45253bba
objdata_02_off0002877d.bin rtf-objdata-decoded RTF \objdata at offset 0x2877D 26683 bytes
SHA-256: beaa9d47b66b2934f5552386f38cc55abbea8fab15e3381ba76155a525121810
objdata_03_off0003b797.bin rtf-objdata-decoded RTF \objdata at offset 0x3B797 26683 bytes
SHA-256: 91fef9eac429fa523a6e98279f5454c6b8da0e083aa2706e9acb00b76ed656e7
objdata_04_off0004e7b1.bin rtf-objdata-decoded RTF \objdata at offset 0x4E7B1 26683 bytes
SHA-256: c5ffab9122ac4ccede77c604d6a0a29a55b23d94adee620e98807c983850f96e
objdata_05_off000617cb.bin rtf-objdata-decoded RTF \objdata at offset 0x617CB 26683 bytes
SHA-256: f5c02a7ecaba45b70ae1df31e8b4909e3ee999dcea8f09fe9a7a827709b60561
objdata_06_off0007482f.bin rtf-objdata-decoded RTF \objdata at offset 0x7482F 26683 bytes
SHA-256: 993237436eda898c76d9e8b0f155f9726af740f91459e3d9cb01f5382ef352f6
objdata_07_off000872ca.bin rtf-objdata-decoded RTF \objdata at offset 0x872CA 26683 bytes
SHA-256: 64a034e72d1c04dbaed890f77f5ea35bce19559aa0125972b56bd35f32ce2dd6
objdata_08_off0009a2f5.bin rtf-objdata-decoded RTF \objdata at offset 0x9A2F5 26683 bytes
SHA-256: 1850bcbf950f06d8a4378ce2c5272124df6d05970532af59c46a8cb5ba6db238
objdata_09_off000ad30f.bin rtf-objdata-decoded RTF \objdata at offset 0xAD30F 26683 bytes
SHA-256: 8418b422a3b5b84ddf78e8c81b624cd0ae745eceacabb7b59fdb6c35f919c639
objdata_10_off000c0329.bin rtf-objdata-decoded RTF \objdata at offset 0xC0329 26683 bytes
SHA-256: d08c98924a9218b78e7f070edd9bf551ec301e49b479bd91426eb6784ec11d4b
objdata_11_off000d3343.bin rtf-objdata-decoded RTF \objdata at offset 0xD3343 26683 bytes
SHA-256: 113410b5ef4c6b073a51ad16755e3d760837df6bac1443852c4d908533f4c2e5

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