Malicious RTF — malware analysis report

Static analysis result for SHA-256 3fe71eb8072ebba1…

MALICIOUS

RTF

841.3 KB Created: 2018-03-12 22:20:00 First seen: 2018-06-25
MD5: 06badb0f8a6ef9872f911f2fb2a9f2a9 SHA-1: 5265e5876714cdba17b3404bffcc7f624f1b5430 SHA-256: 3fe71eb8072ebba10d24eb2fbdc374bea5d3ae2a7baa7e4d6eae7372d154cdc9
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: Xls.Downloader.Generic-6750544-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-6750544-0
  • \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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002c53.bin rtf-objdata-decoded RTF \objdata at offset 0x2C53 28731 bytes
SHA-256: 06574fcd786b96fadd4a9e2a74843f868fc4bbf4a6d2a7def292874d7cec5137
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_01_off00016c9a.bin rtf-objdata-decoded RTF \objdata at offset 0x16C9A 28731 bytes
SHA-256: 501968189dc072e9d0de71c9da5719b52309677a60e07ade087b2bce57982eeb
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_02_off0002ace1.bin rtf-objdata-decoded RTF \objdata at offset 0x2ACE1 28731 bytes
SHA-256: 58ba5696ca453c65ea7fa0c9a6e34c4d4513f26dc9cd19d88d24ab9405a8b48a
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_04_off00052d6f.bin rtf-objdata-decoded RTF \objdata at offset 0x52D6F 28731 bytes
SHA-256: 9b40ac9ccf4d6708b129a6c5d4d03c0be96ea8d469ab44f1390774830b203928
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_06_off0007adfd.bin rtf-objdata-decoded RTF \objdata at offset 0x7ADFD 28731 bytes
SHA-256: 8e745e53f515676e2accdfbab6d2b17b0d542e19b5ee5adf3004904ecd2b4182
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_07_off0008ee44.bin rtf-objdata-decoded RTF \objdata at offset 0x8EE44 28731 bytes
SHA-256: 4d79f755947fd4ce5adb5c12379c3cc016b60a8578b347da5ab74dc52d7d8af0
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely
objdata_09_off000b6ed2.bin rtf-objdata-decoded RTF \objdata at offset 0xB6ED2 28731 bytes
SHA-256: 42e05c0ca12bb71668e0276d8cc7d800212881d97cb7d9615520f33736bb485e
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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