Malicious RTF — malware analysis report

Static analysis result for SHA-256 3382505805ce905e…

MALICIOUS

RTF

918.5 KB Created: 2018-05-10 16:58:00 First seen: 2018-06-14
MD5: 568a2138f5eb1984d11275cfbecc7f2d SHA-1: 0c9f46d21a78260975fe3428bd72b48c527ed0c4 SHA-256: 3382505805ce905ea19814e21d426205edf6ee1f1d92f1009e2af7c28ee7f955
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.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.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c17.bin rtf-objdata-decoded RTF \objdata at offset 0x2C17 33339 bytes
SHA-256: 059778776a3bfe118e38aac58223f8bb8f1475a69a1f5aa1e3c8b3c09d8e3e7c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b33.bin rtf-objdata-decoded RTF \objdata at offset 0x18B33 33339 bytes
SHA-256: 36a1160481580251e2195df8f739b88f53fd00f86c5ff73db7d47429fd5a40e8
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea4f.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA4F 33339 bytes
SHA-256: 598adc270095fc30f8755f91a2faec794f813e95f38d87b162cffb649f58ef58
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off0004496b.bin rtf-objdata-decoded RTF \objdata at offset 0x4496B 33339 bytes
SHA-256: 77b66d12e9de148c43392368b74c8a921f2dbce225512feab8cff2c851e05c72
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a887.bin rtf-objdata-decoded RTF \objdata at offset 0x5A887 33339 bytes
SHA-256: b35b8e84a1f0fb82de38f245e987fac906e39a1d9d29490f170c14d30f088053
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000707ef.bin rtf-objdata-decoded RTF \objdata at offset 0x707EF 33339 bytes
SHA-256: 529cdb67548e00e0150d17d3587e3b556070d12439a7da9710b95debff097b91
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off0008670b.bin rtf-objdata-decoded RTF \objdata at offset 0x8670B 33339 bytes
SHA-256: 52832beac1c21452fb59e5531067d8e0fc80cf1d3144465418234a119f7ef74c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c627.bin rtf-objdata-decoded RTF \objdata at offset 0x9C627 33339 bytes
SHA-256: bc98f0473a845d6a21706d5d8fd0926859415218f9236753d202a4b330c430f3
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b2543.bin rtf-objdata-decoded RTF \objdata at offset 0xB2543 33339 bytes
SHA-256: d771e095cc7010fa2b40c64a10fe21ac3000159262c79d5836309a627b8e7b3a
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c845f.bin rtf-objdata-decoded RTF \objdata at offset 0xC845F 33339 bytes
SHA-256: 749870539691351be9b9a2780d8d3d0567c5f71c68127d1c18de6221371c61f3
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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