RTF malware analysis — malicious · 3c4b18a3fb9bf2bc

MALICIOUS

RTF

841.3 KB Created: 2018-03-12 22:40:00 First seen: 2018-06-25

MD5: 2b0b05c660c33bb267f01b63443323bd SHA-1: f497929f6add290a85929876843930f9b9721962 SHA-256: 3c4b18a3fb9bf2bce07c53f53dcb31ab49c23a5f48c24d978c27d8bb32bd1b25

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.

Filename	Kind	Source	Size
`objdata_00_off00002c4e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C4E	28731 bytes
SHA-256: `03ff212744ee170403b6b22dd998c5475c391405a8e91ab78afba8d341278225`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_01_off00016c8f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x16C8F	28731 bytes
SHA-256: `e38d44d55d1d8f4d61c0eecaa2f41ee29592a3569ea707d0556fccadce19ac4c`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_03_off0003ed11.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3ED11	28731 bytes
SHA-256: `080f26089b6c3a28803728eb04417ede2cc80bc32d376d4f7b4a08f02a6cd3f1`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_05_off00066d93.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x66D93	28731 bytes
SHA-256: `cabfe72e350992da39b8b41344bb7fbc872a10c16e6a153476fc6b0d1dceeefc`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_07_off0008ee15.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x8EE15	28731 bytes
SHA-256: `0efecf74f8e73fbb939836d6ef63f796760ca14c0a0c3354392dfbc09fda99b2`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_08_off000a2e56.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA2E56	28731 bytes
SHA-256: `bcc70eec362a78aff658cc6d7118318e451a187509386ff4d40f6f0ff3c68e00`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely
`objdata_09_off000b6e97.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB6E97	28731 bytes
SHA-256: `45c8d4f748fa66968097c947440b4c18b4cebbaa29fa83302b834e80a5a9c109`
Detection ClamAV: Xls.Downloader.Generic-6750544-0 Obfuscation or payload: unlikely

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