RTF malware analysis — malicious · 7d0175ed832a95c5

MALICIOUS

RTF

7.2 KB First seen: 2019-11-20

MD5: 0448839ab4ac779bec867d526a0c5a7a SHA-1: 9a602bc8fd43ffaadf523411dce759505b9a16ab SHA-256: 7d0175ed832a95c5a97181c299dae3083e9c1f1966c10f783eef8deb2e56b5b8

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 the Equation Editor vulnerability (CVE-2017-11882). This indicates the file is designed to exploit this known flaw for client-side code execution. The presence of ".objupdate" further suggests an attempt to force OLE activation. No specific family could be identified, but the exploit vector is clear.

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_off00000032.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x32	3637 bytes
SHA-256: `f6f2706f10fd09afb52af0ae02e9c6739b28b3b6cff839b7646b1e419461d6d8`

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