Malicious RTF — malware analysis report

Static analysis result for SHA-256 f3317a69ae01482e…

MALICIOUS

RTF

918.5 KB Created: 2018-05-10 15:37:00 First seen: 2019-05-10
MD5: e6bc61e56aa94891ac0aae7583e57d98 SHA-1: 4d022576812744a2db29308bc6042144b923c1c6 SHA-256: f3317a69ae01482e176950791e3667dfd1ba6fcee346a03d65511fd9ca92e8fb
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_off00002c19.bin rtf-objdata-decoded RTF \objdata at offset 0x2C19 33339 bytes
SHA-256: 01c2eb89d665b38cb1006d44d4998f7fb0cb1dfc925309cf51c684eb2b608c78
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b31.bin rtf-objdata-decoded RTF \objdata at offset 0x18B31 33339 bytes
SHA-256: a38969dfb31c6570cdca555a279ef5f74e2f84e26c4fce46747e9a90a277ed6c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea49.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA49 33339 bytes
SHA-256: f2aed7f6e6ae67d888598d83f870a9009b0864285b1f3bc1c30ef80ed8b2af78
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off00044961.bin rtf-objdata-decoded RTF \objdata at offset 0x44961 33339 bytes
SHA-256: 19474ecb12066afa8dcd7ffc341f35faace9f196ed677d213c996d26d46b9090
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a879.bin rtf-objdata-decoded RTF \objdata at offset 0x5A879 33339 bytes
SHA-256: 12dda66388b18770454e6e5dcb66152e29dceecb5baf986e1329e271d1714a3c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000707db.bin rtf-objdata-decoded RTF \objdata at offset 0x707DB 33339 bytes
SHA-256: c8257bc91e1706244e6b455a7dc2367a6bc11ecd461fa537eb3f8fe942a315e3
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000866f3.bin rtf-objdata-decoded RTF \objdata at offset 0x866F3 33339 bytes
SHA-256: 171aecc6f29886a764e112206206d3e911e17041d0ad99d52e2cfbbc4ac1f8ae
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c60b.bin rtf-objdata-decoded RTF \objdata at offset 0x9C60B 33339 bytes
SHA-256: bbc16e810165dfc4a30d0081ef2e166372459cd3c00b92132787cf6ce6876321
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b2523.bin rtf-objdata-decoded RTF \objdata at offset 0xB2523 33339 bytes
SHA-256: b10fe0950be5244a108773bb79700cd9c36c0c4581ff665b65a3f5bd1d3e7d1c
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c843b.bin rtf-objdata-decoded RTF \objdata at offset 0xC843B 33339 bytes
SHA-256: 807e44314f39e9ce0928eccde30f0b42bd924343886243cfd7e2147c6c693cdc
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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