RTF malware analysis — malicious · 249c5c71ebc2adb3

MALICIOUS

RTF

14.5 KB First seen: 2023-02-23

MD5: 12b9a19395cf98c9934928d771f65656 SHA-1: 94df6f7ad1ec76eb14cde3f2a1bc6bbaa48f8945 SHA-256: 249c5c71ebc2adb3ba6c243fde0a5ab8ffc3fd4135afb93cd50ea2edc492a709

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.001 PowerShell

The RTF file contains an OLE object with a split Equation Editor ProgID, indicating exploitation of CVE-2017-11882. The \objupdate directive forces OLE activation, leading to code execution. The embedded OLE object data, when decoded, likely contains the malicious payload or instructions to download it. No document body text or scripts were extracted, limiting further analysis of the payload's specific function.

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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001be5.bin` `380808a8c55768902b3b9aa763f5b1bf6ffbd3b418a6c579eebd7a16b2e4985e`	rtf-objdata-decoded	RTF \objdata at offset 0x1BE5	1676 bytes

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