RTF malware analysis — malicious · c80d074df0566106

MALICIOUS

RTF

9.7 KB First seen: 2023-03-24

MD5: fb91a19e6ee422743ae18ad783ffae32 SHA-1: b89ec788fd9446ff696333ba58f4e4b15af33c2f SHA-256: c80d074df0566106360853eddcb32776a0b0a930cbd2524959512ca9bb5ba8ef

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of CVE-2017-11882. The \objupdate directive forces OLE activation, which will likely trigger the execution of the embedded object. The decoded OLE object, objdata_00_off000005ee.bin, is the payload that facilitates further malicious activity, such as downloading additional malware.

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_off000005ee.bin` `728ec3d08124bc7a3fa0200b6839c3a74a74215394e26b4f0478af2790d3abff`	rtf-objdata-decoded	RTF \objdata at offset 0x5EE	1615 bytes

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