Malicious RTF — malware analysis report

Static analysis result for SHA-256 f5fc94d73fad0472…

MALICIOUS

RTF

841.4 KB Created: 2018-03-12 22:55:00 First seen: 2018-06-25
MD5: ec098b7fc3f25a4b58b09dc3ed64bfee SHA-1: 1748108ce1e0decaa1a8d92985ed408fab7c38c3 SHA-256: f5fc94d73fad04729713f62ee4909e4a90165e767718d4195fb17104e7a30a9e
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: 1a27dd8221f20bc8a2ea007595018a661a01704b1a5866ebe48c0f9459ad1805
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: e32308989dd4f47b668e09b35fa0b41f251c3df51012d38808086a986b7f614e
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: b17729fecd07a449d7f3ec952b172e989fa19cc3216cb3cc4dba4cc7f845c52c
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: 46ac7f5e0aeb47858c7e6862527b4a8f27ca99d24b1acab56c7bacaed2c618ce
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: 9ebf53ba63c5dc55aecf63afb059bf15d0a6cb885aadfbee76243f69bf63cef2
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: 188db76428722da8af2983d57697e4c307ff9c721b7606a8364882c297ea5014
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: 5404b3e806eb33c22e806910b94d693bc3bd3f71feac49d3a9b6e66577ade798
Detection
ClamAV: Xls.Downloader.Generic-6750544-0
Obfuscation or payload: unlikely

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