Malicious RTF — malware analysis report

Static analysis result for SHA-256 c8f457649a33e2c8…

MALICIOUS

RTF

918.8 KB Created: 2018-05-07 02:40:00 First seen: 2018-07-27
MD5: 810dc22659b6d0451d9e630c79ec27a0 SHA-1: e2f090fa8c9ccd612b8b0d7dab7e44679a37bf7f SHA-256: c8f457649a33e2c828a70bef48546c7d7a33619dd16ac50207dc744fa4a72260
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_off00002c18.bin rtf-objdata-decoded RTF \objdata at offset 0x2C18 33339 bytes
SHA-256: ae8610c82bc308f9160e89d8fb188c6c858af095b49a0019ea651e09b3b1a57b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b60.bin rtf-objdata-decoded RTF \objdata at offset 0x18B60 33339 bytes
SHA-256: 332f1e5f95ea539a5fd54636bc725a306fa95990f6fdb0274d4043dd0f6ba55e
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002eaa8.bin rtf-objdata-decoded RTF \objdata at offset 0x2EAA8 33339 bytes
SHA-256: f584d48da429766b3f5010795e8de07f7172d65dabfb48c2aa323b8bd202c35d
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off000449f0.bin rtf-objdata-decoded RTF \objdata at offset 0x449F0 33339 bytes
SHA-256: 0754787eb0108b1e489fec67719da3183d8957cabccefe631ad23f0c6a77f407
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a938.bin rtf-objdata-decoded RTF \objdata at offset 0x5A938 33339 bytes
SHA-256: cdd8fd6310af1e7dd88d8896713246468bd0ae5fcf3459761f92b240f0d0eb42
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off00070887.bin rtf-objdata-decoded RTF \objdata at offset 0x70887 33339 bytes
SHA-256: 2a574ae638e9e63d01f25e28b2b06116f40ac8fd4a142e3807a29d849c368825
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000867cf.bin rtf-objdata-decoded RTF \objdata at offset 0x867CF 33339 bytes
SHA-256: f7d9ca1466abb8e4c1629622b5603382c173da5c79babaf04368daf070cf0a4c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c717.bin rtf-objdata-decoded RTF \objdata at offset 0x9C717 33339 bytes
SHA-256: 00f2f72cb6631e08aa30726e8af404ed5766a4754a3972faee79afc0e5a33a7c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b265f.bin rtf-objdata-decoded RTF \objdata at offset 0xB265F 33339 bytes
SHA-256: b35abe606deb82ec69eeb5a4f678431421dd7b137be14005fccd9a426e89aa18
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c85a7.bin rtf-objdata-decoded RTF \objdata at offset 0xC85A7 33339 bytes
SHA-256: 3fa0a00e206e5f2eb988decb9abfef9e9ddcca9f0bb0710d9f8c0869cf12a596
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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