Malicious RTF — malware analysis report

Static analysis result for SHA-256 d4171f8996da4395…

MALICIOUS

RTF

918.5 KB Created: 2018-05-10 16:19:00 First seen: 2018-06-14
MD5: 486e3c8a5c0b25f9c363a06df704b5b8 SHA-1: 3eefef3860ca476a7686a8c45df30f8851e0b167 SHA-256: d4171f8996da4395863933f794586c5b2819d4c77bff267e297ddb3d5c706def
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: fb6df6d4c7f047bef1ac74109fbb9685bdf393b46058b2ebf0020cafcdb8d0ba
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: dac44dbbd0d8585a583bd2cafbca57f78cc8c1f186580a6201a8e1388862f895
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: 7a0d5698bd7fbdfcd459fbf68c827bd0940345b21b1651315ab2e3ab3f15c9db
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: a8d68f041df57843a13d8338e1cabaed09ae5b63d2f012987ef9b7be23848e15
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: c79be1cec192d0de3526ab7acae6d135751017e62697ac6f71d1420521aae45b
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: da9278460a485c601aa17fb525edc461c202b1bd26db603fba1ce329ed8ad2e2
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: 653191ef02e8571d60bcddec64c00e8c7e227f32d75284578985373cb1bb9778
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: 36065f9373d9655a8f6fd370e75f7814d92e4533cb927df8337aa49e0523bca8
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: 5e5a3be7d3e96a0ebd4a4e4c435285f43f6085fc00cfb010a84de110c94131c7
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: 3c82cef43a991fee9cd56f9b8ecc631d203c7249aad1c4ecd4cc79526094393b
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.