Malicious RTF — malware analysis report

Static analysis result for SHA-256 cf88870200945505…

MALICIOUS

RTF

918.5 KB Created: 2018-05-07 02:27:00 First seen: 2018-07-14
MD5: 156e55fa92300c5412289fcc85190288 SHA-1: db6971f501db31a17e43de67069910979c62faf9 SHA-256: cf888702009455058cd026f964eab4a879ddecba2ad3c9fd88bb80aa4ac448dc
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_off00002c14.bin rtf-objdata-decoded RTF \objdata at offset 0x2C14 33339 bytes
SHA-256: 00af5e92e48d1290371106303860dd648c16904a94f06625222827c9fa5a77e3
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b2c.bin rtf-objdata-decoded RTF \objdata at offset 0x18B2C 33339 bytes
SHA-256: 2de8233e72c7c2e1caba41eb91b5ab06936b625d6b9fcb87af737f0fe29aced2
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea44.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA44 33339 bytes
SHA-256: 7143f96db5158a622fcc46b8430e748c3ced9292918ec172ac6e2163e1cbca75
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off0004495c.bin rtf-objdata-decoded RTF \objdata at offset 0x4495C 33339 bytes
SHA-256: 81fddba65949dfbc3edd042e592b2c9948dbe4aefe1d36bfff28ee49156f8799
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a874.bin rtf-objdata-decoded RTF \objdata at offset 0x5A874 33339 bytes
SHA-256: c102fec92b305d09c659f31454d9b6a13bc3a744a6d7cedbd348e00bfbe5c4f1
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off000707d6.bin rtf-objdata-decoded RTF \objdata at offset 0x707D6 33339 bytes
SHA-256: 24440102eadfb75c8a358e97741e751bb5c972e95180b0e510bf4a3675da6381
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000866ee.bin rtf-objdata-decoded RTF \objdata at offset 0x866EE 33339 bytes
SHA-256: f38ddabd7e3322a04c994f882b41a462566af5580ce5c58cac8d3ea7cb43f6d6
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c606.bin rtf-objdata-decoded RTF \objdata at offset 0x9C606 33339 bytes
SHA-256: e1f1e80a0bfa464aa4788a313b15fdd2c84caffb3c31bbf5b526801cba8f8a5f
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b251e.bin rtf-objdata-decoded RTF \objdata at offset 0xB251E 33339 bytes
SHA-256: 1a48a5a6691e4684f70d475e9c7145528edbe5195952d1585fa6ebaa80e21d3e
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c8436.bin rtf-objdata-decoded RTF \objdata at offset 0xC8436 33339 bytes
SHA-256: ba6f8bc437fa7499a4d1ee52af9af70ad35e31b7496cb38f85b180dc9ccc7a6f
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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