RTF malware analysis — malicious · 5c28ada6c4d825b6

MALICIOUS

RTF

9.2 KB First seen: 2019-01-11

MD5: b4b728d3c7a24d347cc7f8ae8ffaccf0 SHA-1: 7e7e35773198297cc0be72162ba245ba9e911923 SHA-256: 5c28ada6c4d825b658c009d4c45cb44e370d958bf79a4b8830992002da21d292

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and specifically triggers heuristics for CVE-2017-11882, indicating exploitation of the Equation Editor vulnerability. This vulnerability allows for arbitrary code execution, likely as part of a spearphishing attachment campaign.

Heuristics 5

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
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.
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
\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.
OLE object data medium RTF_OBJDATA

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003a.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3A	4668 bytes
SHA-256: `773a117d3b65830786c6533b86bf845f443c6295f55467791aa08c30e52642db`

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