Malicious RTF — malware analysis report

Static analysis result for SHA-256 5cb7c19463750157…

MALICIOUS

RTF

932.2 KB Created: 2018-05-07 02:22:00 First seen: 2018-07-14
MD5: c907e2351ddd1ff0a8f64f0155c2cd66 SHA-1: 114c4134bef6658b097bcfbcee8f7248bbd5d4df SHA-256: 5cb7c19463750157304fe0488ae19d99d5abdb08da43ac9da43d0a4f7165a9a4
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_off00002c4b.bin rtf-objdata-decoded RTF \objdata at offset 0x2C4B 33339 bytes
SHA-256: 46eea748cac271fac487207ecad3facdba9dfa6af13266196804fbad4ce41b93
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off000190da.bin rtf-objdata-decoded RTF \objdata at offset 0x190DA 33339 bytes
SHA-256: 23590fd492cf3f95c8cf4637a49ef383847792012e979bc62e8ef5abc4da2640
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002f569.bin rtf-objdata-decoded RTF \objdata at offset 0x2F569 33339 bytes
SHA-256: aa51c136c3dbf88fe7d8937a7add75a2429f57bfd246badadb67a8973bb43c0c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off000459f8.bin rtf-objdata-decoded RTF \objdata at offset 0x459F8 33339 bytes
SHA-256: fec92e20a2c752f8ac9428fbe0a0dc4795854c3059de89eff60e1fe557020e3f
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005be87.bin rtf-objdata-decoded RTF \objdata at offset 0x5BE87 33339 bytes
SHA-256: 50c65cb7768db9263c4d8ef257707eaf370d1fefa5b98481f6a94b6f8198ae92
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off00072362.bin rtf-objdata-decoded RTF \objdata at offset 0x72362 33339 bytes
SHA-256: a0ba6b1beaa4b07400d30cc7424deb28a704979049ab9101ce443322421bcb74
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000887f1.bin rtf-objdata-decoded RTF \objdata at offset 0x887F1 33339 bytes
SHA-256: b02b18c8037952ac17658c74b8cd32c74b40cf84fb8a6e14ad26201016ec5cc2
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009ec80.bin rtf-objdata-decoded RTF \objdata at offset 0x9EC80 33339 bytes
SHA-256: cc770a00286e341a54da06fac5a6544b7b60352426f61d9d7da7171f88cfde54
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b510f.bin rtf-objdata-decoded RTF \objdata at offset 0xB510F 33339 bytes
SHA-256: ae6e502d875b9ef5861bfe2d3ba60130c726d18b26879eb461303365949f7d9e
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000cb59e.bin rtf-objdata-decoded RTF \objdata at offset 0xCB59E 33339 bytes
SHA-256: ada59e4ad1fabf10ad0d21064a0d1b04bcfc4f21441bc4799a52bfa94b6012b0
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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