Malicious RTF — malware analysis report

Static analysis result for SHA-256 3d7900efd9c4fd05…

MALICIOUS

RTF

918.7 KB Created: 2018-05-10 16:04:00 First seen: 2018-06-14
MD5: 9077b8e82ec01047b2a7e4c6cffea50f SHA-1: daed0b0206620696b4f050b356243e3a9837bbb5 SHA-256: 3d7900efd9c4fd05e973e9069bd92ad000e11d13c6aea4f461ba8141b1851629
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 utilizes \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 execute arbitrary code. ClamAV detections further confirm the malicious nature, identifying it as a dropper. The embedded URL is likely part of the exploit chain.

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-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • \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_off00002c8e.bin rtf-objdata-decoded RTF \objdata at offset 0x2C8E 33339 bytes
SHA-256: cf04834b61ccb8df1b93c1aedf2427433a203a1cb6f8b78f8382ce38fe9c449f
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018baa.bin rtf-objdata-decoded RTF \objdata at offset 0x18BAA 33339 bytes
SHA-256: 5b8d2708763547878f1f505b9c031d0f346242ffdf6d7737d970e4c6c0923702
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002eac6.bin rtf-objdata-decoded RTF \objdata at offset 0x2EAC6 33339 bytes
SHA-256: 6b05d81f6d866f0e983d3537e7074dd41db80e4f8c59dbcc6cd482e80c60c085
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off000449e2.bin rtf-objdata-decoded RTF \objdata at offset 0x449E2 33339 bytes
SHA-256: e5a2686c01519da28e6492e8bb057a21a5d00a6c1ef318a826bfadd5b92174e7
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a8fe.bin rtf-objdata-decoded RTF \objdata at offset 0x5A8FE 33339 bytes
SHA-256: fb790b2bfef28b04907d7d52f4015e4a4cf5b813a5f444da1853c9ebac2e7452
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off00070866.bin rtf-objdata-decoded RTF \objdata at offset 0x70866 33339 bytes
SHA-256: 834066bb29c5f358746f6205b11c51de4e15f92e7a1defbce4e5efa6bcf96b8b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off00086782.bin rtf-objdata-decoded RTF \objdata at offset 0x86782 33339 bytes
SHA-256: 9259376d2c6774d0ea801aa125018d6eff0d5949db01f14e3b1e2ce628862a3e
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c69e.bin rtf-objdata-decoded RTF \objdata at offset 0x9C69E 33339 bytes
SHA-256: 7b5267609283613a7695427ab3e5834134b1bae82fc79ba33506065e08917e9b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b25ba.bin rtf-objdata-decoded RTF \objdata at offset 0xB25BA 33339 bytes
SHA-256: dec728d2e79b592775ec8a9235ea024ca3c40a06657a06ad30fc3e270138afad
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c84d6.bin rtf-objdata-decoded RTF \objdata at offset 0xC84D6 33339 bytes
SHA-256: 49545180c4f895c80d846fe809635e5ff1acda9e33853341984c8d8b5ca397f7
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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