Malicious RTF — malware analysis report

Static analysis result for SHA-256 45ae766650a0e236…

MALICIOUS

RTF

918.9 KB Created: 2018-05-10 16:02:00 First seen: 2018-06-19
MD5: bc5867cfb12dae792a1352c9196ebb31 SHA-1: b1ba7adb5da659585604b75af56d026e2c79db12 SHA-256: 45ae766650a0e236059d3a5c29bcbbd33d98c7752d6eaac23f95065c4c3de7d4
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_off00002c1b.bin rtf-objdata-decoded RTF \objdata at offset 0x2C1B 33339 bytes
SHA-256: 733b53026305db6d58b46d62f6127e5f6eaff985f0118190cabad76664830212
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_01_off00018b58.bin rtf-objdata-decoded RTF \objdata at offset 0x18B58 33339 bytes
SHA-256: 741dc586a66ead58bb99bcef87d1b125dd17628db53d5f92bca00db085e39545
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_02_off0002ea95.bin rtf-objdata-decoded RTF \objdata at offset 0x2EA95 33339 bytes
SHA-256: 8a326bc03932e059595cab1572b557907967b15163cfcc768cf0d0a97340620a
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_03_off000449d2.bin rtf-objdata-decoded RTF \objdata at offset 0x449D2 33339 bytes
SHA-256: d21183bd1a407178c59990a014cd6093f93c320b0ebc20fd5ea29a4dbb14d064
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_04_off0005a90f.bin rtf-objdata-decoded RTF \objdata at offset 0x5A90F 33339 bytes
SHA-256: 718c2d5b085b0f74181e2949e90a5434903107273b1ce8aaf606fcf08660b198
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_05_off00070898.bin rtf-objdata-decoded RTF \objdata at offset 0x70898 33339 bytes
SHA-256: ba2500bf0aa698055962570153e18b1e64e59a363e1ebed2e81d5d374d9a8582
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_06_off000867d5.bin rtf-objdata-decoded RTF \objdata at offset 0x867D5 33339 bytes
SHA-256: b8f2bd106de0dadc72ab7f76e77866ea5b15c6a9efb6f2f05beb35b24978c71d
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_07_off0009c712.bin rtf-objdata-decoded RTF \objdata at offset 0x9C712 33339 bytes
SHA-256: 9cd69269fc3708b16ae8b257b82434b7b26dec1f2c5a50cb922d7b18e54df489
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_08_off000b264f.bin rtf-objdata-decoded RTF \objdata at offset 0xB264F 33339 bytes
SHA-256: 91c4c54e9b7496e10b6a7ecdda4770acdc1a66491ec0d0ef3b5ab6a464b4a5e8
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely
objdata_09_off000c858c.bin rtf-objdata-decoded RTF \objdata at offset 0xC858C 33339 bytes
SHA-256: 582f927a20fc3ceaf72a59970f4d130271f6420d0ee72bce9b94d307b0944542
Detection
ClamAV: Doc.Dropper.Agent-6412232-1
Obfuscation or payload: unlikely

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