RTF malware analysis — malicious · e3bfef9f0d8d9a87

MALICIOUS

RTF

841.4 KB Created: 2018-03-12 22:27:00 First seen: 2018-06-25

MD5: 442cb3d02405a68557c7fe286c8c5b8c SHA-1: 5d54afe1b5f1da8b9d5bd336025056ad47c5c5b3 SHA-256: e3bfef9f0d8d9a87838812941980aaf05f06c166d54fd77ed97c68cb4bcb1bf5

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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c4c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C4C	28731 bytes
SHA-256: `858b5f81e815d0a75deccab120a5c7386c11fa08cd8694af8341ed9a72d6aad7`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_01_off00016c8d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16C8D	28731 bytes
SHA-256: `5ea719b27d3acd622be7e86fa1b6d6d19731acd63f815aeebe971a7fbbcb8c7f`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_03_off0003ed0f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3ED0F	28731 bytes
SHA-256: `c3c52378e6050cde38863f8905fb6ea259e5cf6360e2ba431d7031cc1a65bf12`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_05_off00066ddb.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x66DDB	28731 bytes
SHA-256: `ea4c03d69770912ddd76038d302ccf6dca74bedafb9d40725c39140eac8a4c0c`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_06_off0007ae1c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x7AE1C	28731 bytes
SHA-256: `46c95152dbad2b16b2dcafaf599ad889768a6b9cfe723e41ce8a92214e80bdd2`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_08_off000a2e9e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA2E9E	28731 bytes
SHA-256: `c96e331800f57f4b3d2d2c386776e2f85ec5ea41f3ff1cb1160eea5d14fad9bd`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely

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