RTF malware analysis — malicious · 138d62f8ee7e4902

MALICIOUS

RTF

457.8 KB Created: 2017-12-08 06:29:00 First seen: 2019-11-20

MD5: 5af6c9c49012dabd1468dcfa3f3e49a1 SHA-1: 6f6d526287dd7de10242bdf198d091a8035a5c5b SHA-256: 138d62f8ee7e4902ad23fe81e72a1f3b7ac860d3c1fd5889ed8b8236b51ba64b

422 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Phishing: Spearphishing Attachment

The RTF document contains multiple critical heuristic firings indicating exploitation of CVE-2017-11882 and CVE-2017-8759, both related to Microsoft Equation Editor vulnerabilities. The presence of OLE object data and an embedded package further supports the exploitation of these vulnerabilities for arbitrary code execution. The file is likely a malicious attachment delivered via spearphishing, designed to exploit these flaws to download and execute a secondary payload.

Heuristics 11

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882

Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
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.
CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514

RTF contains a hidden \svb hex package with DrsE2oDoc and downRevStg drawing compatibility parts. This matches an observed CVE-2026-21514 exploitation shape that manipulates Word's internal document structure and trust decisions.
ClamAV: Doc.Exploit.Cve_2017_11882-7570663-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.Cve_2017_11882-7570663-1
\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.
Package object class high RTF_OBJCLASS_PACKAGE

OLE Package object — can wrap arbitrary files
OLE object data medium RTF_OBJDATA

RTF contains 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
Suspicious extracted artifact medium 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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0002c063.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2C063	134896 bytes
SHA-256: `33d78bde730defde1afc7e70367b639c7373eb084567e93db6a30c853a1c9bdb`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`objdata_01_off0006de93.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6DE93	9259 bytes
SHA-256: `fc77889c4d6682c34d7804173535b01aa023e3e2f0f13a8537b00f90a90c23de`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: NOP sled, SC_GETPC_CALL, SC_STR_VIRTUALPROTECT Static shellcode analysis recovered API/import strings: VirtualAlloc, VirtualAllocEx, VirtualProtect, VirtualProtectEx, WriteProcessMemory, ReadProcessMemory
`rtf_svb_000051f3.zip`	rtf-svb-package	RTF \svb hex-decoded ZIP at offset 0x51F3	28665 bytes
SHA-256: `2b5c87664c8d698c9ac98db8d5e6a50dc5c307258b336f9104edd8ddce364727`

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