RTF / .DOC malware analysis — malicious · 2a85b13c4cc993b4

MALICIOUS

RTF / .DOC

2.00 MB Created: 2018-03-04 14:26:00

MD5: f7637a8f689a18fb3178c9237ef8a7ce SHA-1: 8ec629044a36cece49df8eda42482c779a97b97b SHA-256: 2a85b13c4cc993b46e9aaa54bd1ed2df499cc3f4ca86a236f126fc54f59d9e78

564 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Visual Basic T1204 User Execution

The sample is an RTF document that leverages two critical vulnerabilities: CVE-2017-11882 (Equation Editor) and CVE-2017-8759 (MSXML SAX OLE activation). The presence of OLE object data, including a PE header within hex data, strongly suggests that the document is designed to embed and deliver a secondary executable payload. The 'SE_ENABLE_LURE' heuristic indicates that the document likely prompts the user to enable content, a common social engineering tactic for malware droppers.

Heuristics 15

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.
Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED

RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
Equation Editor CLSID critical RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Equation Editor object class critical RTF_OBJCLASS_EQUATION

Object class 'equation.3' references Equation Editor
PE header (with DOS stub) in hex data critical RTF_MZ_HEX

Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
ClamAV: Doc.Dropper.Agent-6529506-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6529506-0
\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 ~1923KB of hex-encoded data inside \objdata sections — may hide a payload
OLE object data medium RTF_OBJDATA

RTF contains 4 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM

RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact info 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/wordm

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00002b61.bin` `643162f56be80ce22f79fa1badb429c0196706ddc417f6b0db0b8cdc6e6317f0`	rtf-objdata-decoded	RTF \objdata at offset 0x2B61	961600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.59, consistent with packed or encrypted content.
`objdata_01_off001f314c.bin` `3382db8f6b736b12a349df724ee213f8b536038f5c7beb126a29c161b5ef93e5`	rtf-objdata-decoded	RTF \objdata at offset 0x1F314C	4183 bytes
`objdata_02_off001f53fa.bin` `c4611fd774a89e42093812e4b8d630b0210a476184df69bc6ffbe2418128f165`	rtf-objdata-decoded	RTF \objdata at offset 0x1F53FA	3826 bytes
`objdata_03_off001fe520.bin` `6e2aea7ea2cc078526bd52a97cd3e0f071a0d34e368f94f41b87a877119743ce`	rtf-objdata-decoded	RTF \objdata at offset 0x1FE520	3546 bytes

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