RTF / .DOC malware analysis — malicious · 2abb310112e3827d

MALICIOUS

RTF / .DOC

9.1 KB First seen: 2022-06-27

MD5: b137678de2576da6d5393fe760206b19 SHA-1: b049b4dea60fe05bac13d0bf10e746ee21079572 SHA-256: 2abb310112e3827d9771119b14a257f2b85adc6a7a5d0f418f54ff75780fa883

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an RTF document that contains embedded OLE object data. Critical heuristics indicate the presence of the CVE-2017-11882 vulnerability, which is exploited via a font record overflow in the Equation Editor. This vulnerability allows for arbitrary code execution.

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.
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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000000a9.bin` `6d6b84427d9b7f6bd72f7d9046e57e3405c33fbb540815f461f004bca98435df`	rtf-objdata-decoded	RTF \objdata at offset 0xA9	4289 bytes

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