Malicious RTF — malware analysis report

Static analysis result for SHA-256 41e48e53f8512a11…

MALICIOUS

RTF

731.9 KB Created: 2018-05-02 20:04:00 First seen: 2018-06-14
MD5: d80284424e9d03c554ed3dcd8b0275d9 SHA-1: 6006b9d7f937401c1eb3472712a054bf62109243 SHA-256: 41e48e53f8512a11521d7027679e5db71b3070e54aedc8233784bc65ecf35da6
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_off00002c45.bin rtf-objdata-decoded RTF \objdata at offset 0x2C45 23099 bytes
SHA-256: d4a6163fbf74f1417509641fe8665e47a712bb9f23c05a705e963973ae4dfe5d
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off000140bc.bin rtf-objdata-decoded RTF \objdata at offset 0x140BC 23099 bytes
SHA-256: cb48c498ab982bb6e25d77b16ead478d9e649005b97bca23693f44aba362afd3
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off00025533.bin rtf-objdata-decoded RTF \objdata at offset 0x25533 23099 bytes
SHA-256: fdc5eba7af1da750cc48c45d00135a85946a3a9dbf7c95a92e3ae0e9c8bb9e46
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off000369aa.bin rtf-objdata-decoded RTF \objdata at offset 0x369AA 23099 bytes
SHA-256: 4518b6b0cab80b27a03a4a65af9e8f7cb963cbf7c648eae4e377a057911117b2
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off00047e21.bin rtf-objdata-decoded RTF \objdata at offset 0x47E21 23099 bytes
SHA-256: 2cf168874087c8f643065e07bfe2020f7ea67fffab390132bc4a474b6a99f25d
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000592e4.bin rtf-objdata-decoded RTF \objdata at offset 0x592E4 23099 bytes
SHA-256: 9a9280c4948e216079825e24f57debfacfcb857ea6e9bf78093ac44d479aca5f
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off0006a75b.bin rtf-objdata-decoded RTF \objdata at offset 0x6A75B 23099 bytes
SHA-256: f8a11f52938e73f2c2de5cbaf443cdc11c28ee421a010711e46a8058eb418f9f
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0007bbd2.bin rtf-objdata-decoded RTF \objdata at offset 0x7BBD2 23099 bytes
SHA-256: 05da247d512ebbfa3edd8407c8de9caca35f84e1e9c9c9ae13c2ae6bda28378b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off0008d049.bin rtf-objdata-decoded RTF \objdata at offset 0x8D049 23099 bytes
SHA-256: 760f8d5f83e8cc63627184264b8ab95aec3e65d2cb149a001557c67ecebfe8c7
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off0009e4c0.bin rtf-objdata-decoded RTF \objdata at offset 0x9E4C0 23099 bytes
SHA-256: cd7819d3323c609490b320fc451d046c8da8b1e006201525f25db9bcbee145c9
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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