RTF malware analysis — malicious · af84b24296b2b57b

MALICIOUS

RTF

841.3 KB Created: 2018-03-12 22:53:00 First seen: 2018-06-21

MD5: 8a6f4b37ed36ae1d6035868ddaf6d2b7 SHA-1: d6a1101effa8d19e5fe969ab90d817cd856ef505 SHA-256: af84b24296b2b57b02e0780ce1a6a0072fe4d27d8610392403b446c62b817f62

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_off00002c53.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C53	28731 bytes
SHA-256: `acd3b996db9ac87c9ddbbeb18c534012ac2b680076ed8f3b612eb39b0f1ff4b8`
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: `7a0c7edcc1075841cf74782d360c0db71d19ad7392ea3fd461bfb19cea0f1bc9`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_03_off0003ed28.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3ED28	28731 bytes
SHA-256: `e2ed7e06d23f7526d455f018fcbb7ee3fec2ed87d31d3967f2d6f1bbce5016dd`
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: `12993f6db0e2b211ec1b52c2f3e2704845fc5677a9ab3d0b5034e8185c92213a`
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: `39a3a6bca38c944869f6fc4abfc87fb0b1405bd2d2810556c941c11faa29f60f`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_08_off000a2e8b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA2E8B	28731 bytes
SHA-256: `55767a34d5e7e10412c279cefd9bb00d721dff87e65cd1fb2e49df72e57e97b6`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely

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