Malicious RTF — malware analysis report

Static analysis result for SHA-256 bf45969c1cfb6f80…

MALICIOUS

RTF

821.5 KB Created: 2018-03-31 16:44:00 First seen: 2018-04-23
MD5: f96daa1b221c5c2a598e3f46bfd518dd SHA-1: 31dcc950be8806e7cfa1be7dcc1abc99974b666c SHA-256: bf45969c1cfb6f80a0fd9d06783f3b7e721a11716d381fd41d6d93418e489626
262 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 triggers an ".objupdate" command, which is indicative of exploiting vulnerabilities like CVE-2017-8759 for client execution. ClamAV detections further confirm its malicious nature, flagging it as Doc.Macro.Obfuscation. The primary attack vector is likely spearphishing attachment, with the embedded OLE object serving as the mechanism to download and execute a secondary payload.

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.Macro.Obfuscation-6391394-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscation-6391394-0
  • \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 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.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c41.bin rtf-objdata-decoded RTF \objdata at offset 0x2C41 27707 bytes
SHA-256: c7df689fa9e48f51bc69df9904ff29000c49731b5e30d1513b5e9b1fd578d374
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_01_off00016478.bin rtf-objdata-decoded RTF \objdata at offset 0x16478 27707 bytes
SHA-256: 6da5a12f7fe18dd86677b14aa54b89eef25b1e8c1c09fa5e9de5c27c7da219f3
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_02_off00029cfb.bin rtf-objdata-decoded RTF \objdata at offset 0x29CFB 27707 bytes
SHA-256: 76b3db07f5fa6e5ba5a1dba34b613de42415ac3be6c5ee7cb77a9d29f1c532a1
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_03_off0003d532.bin rtf-objdata-decoded RTF \objdata at offset 0x3D532 27707 bytes
SHA-256: 79f2aa0ce0fe232e3ca4b328e549c2f094fcb002a3c6cde05989940643dcafd7
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_04_off00050db5.bin rtf-objdata-decoded RTF \objdata at offset 0x50DB5 27707 bytes
SHA-256: db7bc3afab47555b42d28d721a0b7094b7a63eb99f94be955b2467b1dc639a09
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_05_off000645ec.bin rtf-objdata-decoded RTF \objdata at offset 0x645EC 27707 bytes
SHA-256: a00283aa68e2b6812b3030753baf5c7d56bae4907467702579c8a1d62111e42b
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_06_off00077e6f.bin rtf-objdata-decoded RTF \objdata at offset 0x77E6F 27707 bytes
SHA-256: 04a3604afea4ed038aa8eb99709e47e0d2b4139e7515cb8f3a7c3fcc2d308739
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_07_off0008b6a6.bin rtf-objdata-decoded RTF \objdata at offset 0x8B6A6 27707 bytes
SHA-256: 89f8d57dca5568f019f88bf692ac0eafd96ef71f2f98ad25b88e546e2793e0c3
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_08_off0009ef29.bin rtf-objdata-decoded RTF \objdata at offset 0x9EF29 27707 bytes
SHA-256: 04c19bc16e64a7c37581d34966b09517f60b9b532cb5d637ca875bfbc7b536fa
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely
objdata_09_off000b2760.bin rtf-objdata-decoded RTF \objdata at offset 0xB2760 27707 bytes
SHA-256: f2b04b89a8986396e5c28d4d659935b2fc0b269f026b96d56d8d4b2d73ed987f
Detection
ClamAV: Doc.Macro.Obfuscation-6391394-0
Obfuscation or payload: unlikely

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