RTF malware analysis — malicious · 2a58ab1121885df9

MALICIOUS

RTF

8.3 KB First seen: 2019-08-04

MD5: 1d5616f52da473fe89029cd18baea2ec SHA-1: c5b8a2ccb0ff21a303754cd655372f9275c2f3a6 SHA-256: 2a58ab1121885df90a28838897e97a08b553be30c5eed6061931adddd6f1e4ce

180 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, which is a common method for delivering further malicious payloads. The presence of RTF_OBJUPDATE suggests an attempt to automatically activate the embedded object.

Heuristics 4

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.
\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_off00000033.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x33	4148 bytes
SHA-256: `cb5c9881c280d9170e49c3758e3ec366797e52accde7760dce6eeb9a4f549e1a`

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