RTF / .DOC malware analysis — malicious · 5cffd3330356fdd0

MALICIOUS

RTF / .DOC

320.0 KB

MD5: 951c0b2eff049e5541d6478d00ed53c7 SHA-1: 13da1b3423284f97c5243846e79a6af304542c4e SHA-256: 5cffd3330356fdd0f9e9c5273f328780cdfc8fda70b6898c00f2cee298ebc1fa

242 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document that exploits the CVE-2017-11882 vulnerability in the Equation Editor component. This exploit allows for arbitrary code execution, which is typically used to download and execute a second-stage malware payload. The presence of OLE object data and the specific ClamAV detection signature strongly indicate this exploit.

Heuristics 6

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.
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
ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
\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.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001097.bin` `063d67242ad42438bb9bcb1bcb652036c2bdcceb5d2b539291af959b31554048`	rtf-objdata-decoded	RTF \objdata at offset 0x1097	161374 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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