RTF / .DOC malware analysis — malicious · cbd7a7fc7ce2bf54

MALICIOUS

RTF / .DOC

70.6 KB First seen: 2023-08-25

MD5: b6cc18265abfe600f6ef708feb17f1fb SHA-1: bf9788e8fc534eb7d2c4af8673f443cfbef8c927 SHA-256: cbd7a7fc7ce2bf5406bf33714dcaf86025fe83c4f885434b615a5133a1d7a620

160 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an RTF document that leverages the CVE-2017-11882 vulnerability within the Equation Editor OLE object. The document body contains a lure to "Enable editing", indicating a social engineering attempt to bypass security measures. The presence of the OLE object and the specific CVE exploit strongly suggests the document's primary purpose is to execute arbitrary code, likely to download and run a second-stage payload.

Heuristics 5

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.
\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 1 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00004066.bin` `2ad630c7a935cb6470c7aa3f720fb86532fb914141cf11fcbd80177a5cfb8b52`	rtf-objdata-decoded	RTF \objdata at offset 0x4066	4166 bytes

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