RTF malware analysis — malicious · 77ad099972f2eb6f

MALICIOUS

RTF

44.5 KB First seen: 2019-04-18

MD5: 1f6ff2a71ffdbd9113139d6a48a4558c SHA-1: 5b172e4d8c150c65d2834eedd4d0d9e830154d10 SHA-256: 77ad099972f2eb6f238250a819ef9266efc0ce23ac0f22750aedfb7f5451896c

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains critical heuristics indicating the exploitation of the Equation Editor vulnerability, likely to achieve code execution. The presence of OLE object data and an \objupdate directive further supports this. While no specific malware family is identified, the technique strongly suggests a downloader or initial access mechanism.

Heuristics 3

Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\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_off00001103.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1103	2190 bytes
SHA-256: `690470eedd58b775fb9f002ee0c7b48723c7b4e03dbc0287791fd6b8d444fbde`

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