RTF malware analysis — malicious · 736a5f7ef86f564b

MALICIOUS

RTF

8.2 KB First seen: 2019-08-04

MD5: a14a97be93d84ac6a2c536ec59c7ac95 SHA-1: a49fb9dbfa12826c796d95dc6adb5f81a16d1188 SHA-256: 736a5f7ef86f564bcffa5cfce77b20cc2536a0cf06933506d26a8c84d96269da

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability in Equation Editor (CVE-2017-11882) is being exploited. This exploit 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: 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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	4142 bytes
SHA-256: `7418f3feb71525dc9dbb08187afeb30cb281ed681e684d8a4ba7b0d85a132af4`

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