RTF malware analysis — malicious · a08f3822a898633c

MALICIOUS

RTF

265.0 KB First seen: 2019-04-17

MD5: 7246092f01724967847430867f9f3ae8 SHA-1: 63170dbb64bafd39d0c44164e90ccfa723714eea SHA-256: a08f3822a898633ce015d85c775ed7aa417544452b9ce92d76a65f8d5a094849

180 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 heuristics indicate the presence of the CVE-2017-11882 vulnerability within the Equation Editor component. This vulnerability is known to allow for arbitrary code execution, which is likely used here to download and execute a secondary payload. The use of an exploit within a document suggests it was delivered via spearphishing.

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_off00001765.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1765	4138 bytes
SHA-256: `616627223c81d167bc7d375fe8e88a5414da3097fdbf873250fbd7b1854a289b`

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