RTF malware analysis — malicious · c3aa42098908d9e5

MALICIOUS

RTF

921.4 KB Created: 2018-03-12 22:15:00 First seen: 2018-06-25

MD5: 46a1e489cc41b2a97aa9d2e9d91eb300 SHA-1: a205f88bba95399953f35836892c5ca12fddc370 SHA-256: c3aa42098908d9e51e3c824ce50bf4b9c9a80e1df2f8d4dca19c5e40b63a85b5

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 11 \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_off00002c52.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C52	28731 bytes
SHA-256: `55e3af4d09b56994b490ea53d6263ea0897c75d859c8d5b24191a9210e43e5bb`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_01_off00016c99.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16C99	28731 bytes
SHA-256: `51370eea154df5888186740d8cea3f03f9c6d86424699aac63a8181541118808`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_03_off0003ed27.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3ED27	28731 bytes
SHA-256: `658581c8510315b9fd7d0afe2bc536173f79ff5b6fe52107b292238aaba1e990`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_05_off00066db5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x66DB5	28731 bytes
SHA-256: `da84a33584f030d336a09fc5f881823f153542361f05c729ab825c9886b8bca6`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_07_off0008ee43.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8EE43	28731 bytes
SHA-256: `8b2813d88407139f30a237d71627b9678b61020721277f79bade16b4d3c81daf`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_09_off000b6ed1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB6ED1	28731 bytes
SHA-256: `609bf51bea869cfabd3399bea8edd978eb6678d0ee0e7bcfbd2b7c30182609c3`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely

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