Rtf.Dropper.Agent-7384550-0 — RTF malware analysis

Static analysis result for SHA-256 aec798ed8785d79a…

MALICIOUS

RTF

953.2 KB Created: 2018-04-18 02:12:00 First seen: 2018-08-05
MD5: fbfb649149b1555143a5763bb3f3824d SHA-1: d15549c2ceadf04017627abc00723b92ada1adb4 SHA-256: aec798ed8785d79a4841fb9db19606236702decba72889b564211f0c20552b8d
202 Risk Score

Malware Insights

Rtf.Dropper.Agent-7384550-0 · confidence 95%

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

The RTF file contains an embedded OLE object that is activated via \objupdate, exploiting CVE-2017-8759. This technique is commonly used by droppers to download and execute additional malware. ClamAV identified the sample as Rtf.Dropper.Agent-7384550-0, supporting its role as a dropper.

Heuristics 6

  • 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.
  • ClamAV: Doc.Dropper.Agent-6934317-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6934317-0
  • \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.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c4d.bin rtf-objdata-decoded RTF \objdata at offset 0x2C4D 26683 bytes
SHA-256: 301173707598a6fbdea825de494ec874f295a4becf2e006f75980a6b7fa6c5c6
objdata_01_off00015c74.bin rtf-objdata-decoded RTF \objdata at offset 0x15C74 26683 bytes
SHA-256: 77b9de7ca05e2a20613bbe76452877d0155b9302f58546c3f703d917737534ec
objdata_02_off00028c9b.bin rtf-objdata-decoded RTF \objdata at offset 0x28C9B 26683 bytes
SHA-256: 3ec5099997f269a67d17cffd47c5156dbc4545d27f0bf554006c892d53c69598
objdata_03_off0003bcc2.bin rtf-objdata-decoded RTF \objdata at offset 0x3BCC2 26683 bytes
SHA-256: 87d10bd40d07bef99fe09d4a3325be0e3624aabb01923021d9d5071ae50b2970
objdata_04_off0004ece9.bin rtf-objdata-decoded RTF \objdata at offset 0x4ECE9 26683 bytes
SHA-256: aed740199e4662394386f9ac0ddd7a1ace670854a748dfc7ada6f40b74fc4d04
objdata_05_off00061d10.bin rtf-objdata-decoded RTF \objdata at offset 0x61D10 26683 bytes
SHA-256: 806fbc9af71e5d148a331346f00862558c765d02a80571cf12f179caec9672b3
objdata_06_off00074d83.bin rtf-objdata-decoded RTF \objdata at offset 0x74D83 26683 bytes
SHA-256: ed11deb7ffbc9bcf695d83282381167c454e2bd313fa0c610cd2170332c543f9
objdata_07_off00087daa.bin rtf-objdata-decoded RTF \objdata at offset 0x87DAA 26683 bytes
SHA-256: 642e793586892e24aab5a59a3672eda8022f4a5e22897d8f0e1312e7acc119e1
objdata_08_off0009add1.bin rtf-objdata-decoded RTF \objdata at offset 0x9ADD1 26683 bytes
SHA-256: 125c66e2e95cbc5c25b8da57cf0949452bb149dde162f0013f0bddc750395fad
objdata_09_off000addf8.bin rtf-objdata-decoded RTF \objdata at offset 0xADDF8 26683 bytes
SHA-256: cedd7871bb8bb39e69bfd71343264ced942454af8c2fe2ebb0b2094a1ec83162
objdata_10_off000c0e1f.bin rtf-objdata-decoded RTF \objdata at offset 0xC0E1F 26683 bytes
SHA-256: fe07da5fa2aa299a6259af9fbbea31a1f4a1e3847c226d21b189baf24cb40523
objdata_11_off000d3e46.bin rtf-objdata-decoded RTF \objdata at offset 0xD3E46 26683 bytes
SHA-256: 539b89d3dec5e66e3d096d941b690facebd6b42feace7a823cc78ea54113e97d

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