RTF malware analysis — malicious · 90d293195bf573c1

MALICIOUS

RTF

1.32 MB Created: 2017-09-07 21:07:00 First seen: 2017-10-10

MD5: 4d581dfc49da7b616aefa2dc6b67301e SHA-1: 8977129f08d1e4bf51e6acc07dc70ee7698c1384 SHA-256: 90d293195bf573c14d39eac6aa6e0786b3282bbd3f4bff850b7dedb7eebb6049

282 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains multiple OLE objects with excessive hex-encoded data, indicative of a hidden payload. The critical CVE-2017-8759 heuristic firing suggests exploitation of MSXML SAX OLE activation. The embedded URL points to a potential second-stage executable, likely downloaded and executed by the exploited vulnerability.

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: 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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1037KB 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://schemas.microsoft.com/office/word/2003/wordml In RTF body
- http://rsb18.rhostbh.com/~bakixeb2/bash/1.exeIn RTF body

Extracted artifacts 10

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000028e8.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x28E8	55342 bytes
SHA-256: `fec1d98d08c21bad3ff4a8cd5611158b4079f19302b346ce2485c723911be58b`
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_off000234de.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x234DE	55342 bytes
SHA-256: `2147f19fd3f82edf2b86080f9dc588dd4ecda54c8d7b00b35bc1cf85e54ae682`
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_off000440d4.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x440D4	55342 bytes
SHA-256: `7e4acec732c9379594f355a5ea12a253bc2b947e641914fc28647b2d1a500004`
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_off00064cca.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x64CCA	55342 bytes
SHA-256: `9c36c7b039ca1ffa66b866c50e3c7ba77b3283c1f7d1af3946354f42cff334b5`
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_off000858c0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x858C0	55342 bytes
SHA-256: `901682d86778b1c48ffdbc2f26eb12a5742dde0d9e3acc3fd7a988fa217dfbb2`
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_off000a64b6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xA64B6	55342 bytes
SHA-256: `40716aa94b842faedb05707287a2e59c288e46941de5454ef7208797a95679cb`
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_off000c70ac.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xC70AC	55342 bytes
SHA-256: `1f10bb6d7348d22316babee81e1156940c663f61023d33b15ca5b8659179474b`
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_off000e7ca2.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xE7CA2	55342 bytes
SHA-256: `04d424e2a45fb7d22f54ae1177b95a228d1d799bbbf14f97b3b20f2431d408fe`
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_off00108898.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x108898	55342 bytes
SHA-256: `bb4c397856876257f36e133adb7c05fa5c9a4b2450a83588e73d5f2372bb1948`
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_off0012948e.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x12948E	55342 bytes
SHA-256: `cd6c02e5be56b188c099212a916ffd7abb71233f5efb02828a843e86eb9d5393`
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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