Malicious RTF — malware analysis report

Static analysis result for SHA-256 49ee7bdf97d611ea…

MALICIOUS

RTF

918.5 KB Created: 2018-05-07 First seen: 2018-07-18
MD5: 2c5569857887adb88e21b6a563c296c3 SHA-1: a69cb0c73b9ffc63d23a813190ae415e0b168ccb SHA-256: 49ee7bdf97d611eaa03174d1ab304a8db27fa3fe188fc864d20459c92c9a7e93
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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c12.bin rtf-objdata-decoded RTF \objdata at offset 0x2C12 33339 bytes
SHA-256: d92e45656e6c139a8e8aea2369f48fe123f215959f6b8b4fe61180352817b5c8
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b2e.bin rtf-objdata-decoded RTF \objdata at offset 0x18B2E 33339 bytes
SHA-256: d388a1996b5037ab633c9ddd38d596ea1e96c3d3b874c8f73650994ca8240a78
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea4a.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA4A 33339 bytes
SHA-256: 9b0897eb38ff8eb32715912d2a1a8dc5ae3116c3bf0c38c9d2b1e593ab5861bc
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off00044966.bin rtf-objdata-decoded RTF \objdata at offset 0x44966 33339 bytes
SHA-256: 9c91fe10dde18e1836c5e89aecacd729aa55c7b9e1dda9608880d7ec0544a50c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a882.bin rtf-objdata-decoded RTF \objdata at offset 0x5A882 33339 bytes
SHA-256: 4ecb45953f465df33000f3c55d05a2df93ca5a5617ec5f6b457ce264ff03e9b0
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b253e.bin rtf-objdata-decoded RTF \objdata at offset 0xB253E 33339 bytes
SHA-256: a682dbfa829d290cee5b749a1b1759008c82b403ef79c5e189267e7b4b8395ae
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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