RTF / .DOC malware analysis — malicious · 9d9284e1bf253338

MALICIOUS

RTF / .DOC

4.7 KB First seen: 2022-07-19

MD5: f47c4cc9624b136f9a9a1224332008fa SHA-1: 7a1ca5a5c7e6227a14884dc54d557625aa082345 SHA-256: 9d9284e1bf253338b4e02f077113d3240cae4384abc74eda2f198a65f42b5408

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is an RTF document that contains embedded OLE object data, specifically targeting the Equation Editor. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly indicates exploitation of a known vulnerability in the Equation Editor component to achieve code execution. The file's SHA256 hash is provided as a primary IOC.

Heuristics 3

Split hex Equation Editor ProgID + OLE object critical 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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000006a.bin` `b741eb27ca60547ddbf55114d7d3ad3bafd96b4fe550b950edbee071e6143b7b`	rtf-objdata-decoded	RTF \objdata at offset 0x6A	2119 bytes

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