RTF malware analysis — malicious · 0e505a2018bff80d

MALICIOUS

RTF

20.0 KB First seen: 2022-05-16

MD5: fbc6129b05dd93d85a9b6cbe68280623 SHA-1: 9c3ab91bcea1784d89ad80e60b47c7d677e2c4b6 SHA-256: 0e505a2018bff80d51d361d46cba13856d0755a5aa020b4f154ad756f0fbdeab

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains embedded OLE object data. Critical heuristic firings indicate the exploitation of CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution, which is typically used to download and run a second-stage payload. The presence of ".objupdate" further suggests that the embedded OLE object is intended to be activated.

Heuristics 3

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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001a83.bin` `5e49eebaffa60be5bf7a66d384c1c24ee8d49f5b9946d49b90e8c71c053d40fa`	rtf-objdata-decoded	RTF \objdata at offset 0x1A83	3776 bytes

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