RTF malware analysis — malicious · 49e11a713e9e4c0c

MALICIOUS

RTF

8.1 KB First seen: 2019-02-26

MD5: 52541ed6a57491e8bf1b512b9087557f SHA-1: 32a32bc7beb4eb15055256f07dbfe0e2243eeb8e SHA-256: 49e11a713e9e4c0cfa64840484d87a95fd443480706fac82289703fb280fe1d3

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 triggers heuristics for CVE-2017-11882, indicating exploitation of the Equation Editor vulnerability. This exploit allows for arbitrary code execution on the victim's machine, likely delivered via spearphishing.

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_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	4135 bytes
SHA-256: `2589be94ad671d082efef4037f2d68c1576e50a976e12cff6e35249f8027af8f`

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