RTF malware analysis — malicious · fdd95d571b70dfc1

MALICIOUS

RTF

705.7 KB Created: 2018-02-07 19:26:00 First seen: 2018-02-19

MD5: 02640462c27a1578060b59bd9b410512 SHA-1: f7c8c4fb562e55085a4fabc09d622dc2894560f7 SHA-256: fdd95d571b70dfc19e9988c7525c95e496ce79d1aef4262a913cde2f2f2935a2

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.Malware.Valyria-6934880-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Valyria-6934880-0
\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 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000029ea.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29EA	22587 bytes
SHA-256: `eeb991cca1666b4e422e01006a3fb704ee64ffe130df4889ba6de6f949c799cb`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_01_off0001358e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1358E	22587 bytes
SHA-256: `5ba1eedc8604c3aedb9af2a2bf8ec157d1908ce7185cbc525b2c1462b3c0a0cb`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_02_off000240a9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x240A9	22587 bytes
SHA-256: `7bac17651f855cc0292d4c981438f56e6ef5fce43bc16f45811b27f5d07c6ef7`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_03_off00034bc6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x34BC6	22587 bytes
SHA-256: `52af0da331a6fa3386b205466ef3747b35d1a7bfc7fb039d2b8d24158819c4c1`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_04_off0004572d.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x4572D	22587 bytes
SHA-256: `808b508ca64553dfcc057841f0521a4d6d64ed39c3ca003c782a4d9cb163aa28`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_05_off0005624a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5624A	22587 bytes
SHA-256: `e87c497f5b0479f09e5c9b0013402c3dbe6057af1aa14d01e3a0bfd6676bb0a7`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_06_off00066d67.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x66D67	22587 bytes
SHA-256: `a9a97c4b0925b084c1b170d2af4b7e5f40f5d57d59605cba3c80c7e2c1bb7cf6`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_07_off00077884.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x77884	22587 bytes
SHA-256: `035fd27c3397fcd22868870934e2efa1a2856e5c67fcb63237c9c828e0c39218`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_08_off000883a1.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x883A1	22587 bytes
SHA-256: `5d43b83f4b1db7ab37006a86efbe71364c935e00b3c00b8b31d65d34d225cb37`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely
`objdata_09_off00098ebe.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x98EBE	22587 bytes
SHA-256: `c2449d9808523221863337b6f233c1d7ed724a3e74111643453d7fdb8355fca1`
Detection ClamAV: Xls.Malware.Valyria-6934880-0 Obfuscation or payload: unlikely

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