RTF malware analysis — malicious · 70e1a7a5a49c9540

MALICIOUS

RTF

2.57 MB Created: 2018-02-04 22:26:00 First seen: 2018-02-19

MD5: 0fa2a9975e66ea8082d6d7a6c20a041f SHA-1: 71d369f43646574a7f8d3f3221738ebd521c75b7 SHA-256: 70e1a7a5a49c9540f42abd4d44fb31411082e84602c165bec9b3aa776a36fe9f

282 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains multiple embedded OLE objects, with heuristics indicating the use of \objupdate to force OLE activation. Critical firings for CVE-2017-8759 and ClamAV's detection of Doc.Macro.Obfuscation-6391394-0 strongly suggest exploitation of this vulnerability. The presence of an embedded URL pointing to a VBS file indicates a likely download and execution chain for a secondary payload.

Heuristics 8

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: Doc.Macro.Obfuscation-6391394-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Macro.Obfuscation-6391394-0
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1079KB of hex-encoded data inside \objdata sections — may hide a payload
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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://fast-cargo.com/images/file/vb/20.vbs\\ In RTF body
- http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002c1b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C1B	67630 bytes
SHA-256: `8eb18f0596b7f33b3f99c31b66f59368f9e33830e1d85b396dd20f5eee20a327`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_01_off00029ade.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x29ADE	67630 bytes
SHA-256: `f0349f4523e080a8c4bcf3308de0b58219119cf0409ec781010fbcf185cd7aba`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_02_off00050918.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x50918	67630 bytes
SHA-256: `c289a9f1f70fb50b4bf7afa3fbd5c24cb2b46eb3e168ced24a0f9653bfa69c4f`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_03_off00077752.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x77752	67630 bytes
SHA-256: `fa45618d531c8d6bd08c033b02fc622bd17c5fffa88754c2d3376154e3a2e10e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_04_off0009e593.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9E593	67630 bytes
SHA-256: `dd679a6cd62a075f9a3d3bc1943e728a8b7e0c8168093b285e13986f6c6f0ab1`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_05_off000c53cd.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC53CD	67630 bytes
SHA-256: `af66b0161e3f14b77e684888d204196d55d2c4d302375e3a8c3ae327913467e8`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_06_off000ec207.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xEC207	67630 bytes
SHA-256: `0b4a7f07ade0fae3df0477454c81c59ca124359d9c46622fce27e58eaa63a3fb`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_07_off00113041.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x113041	67630 bytes
SHA-256: `f5d26af7fc96edba8430395267b7b53f9e8187c442060f6831b4a05af746022d`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_08_off00139e7b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x139E7B	67630 bytes
SHA-256: `06eb07b9ed8b48a427b37466cc55e49b173d43e7927cf4eada9f4558de4d7407`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.
`objdata_09_off00160cb5.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x160CB5	67630 bytes
SHA-256: `b8e630177779c87666c3dca819ac1e78285a973cca377404d8372b60577c210e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered command string(s): WScript.Shell Carved macro source contains an auto-exec entry point and execution/download terms.

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