RTF malware analysis — malicious · 4e6dc53285cfcd83

MALICIOUS

RTF

22.9 KB First seen: 2020-09-07

MD5: 7a361269fe7432e5ff17b7aa48d6396e SHA-1: 3b8bb1547d1c5000db15dd487cb5d2316201cd57 SHA-256: 4e6dc53285cfcd8364efcbef05e5707bd4a9bf4fb82b9a08c49016e99032be02

140 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of a known vulnerability (CVE-2017-11882). The ".objupdate" directive forces OLE activation, leading to the execution of embedded shellcode. The extracted artifact 'objdata_00_off00001eab.bin' is likely the shellcode payload. This suggests the document is a malicious attachment designed to exploit the Equation Editor vulnerability for initial execution.

Heuristics 4

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
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00001eab.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1EAB	1813 bytes
SHA-256: `a641aa058dafad73423ef4887911cc6e0a9863f509a663244403e50a5d2f112e`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

Open this report in the interactive analyzer, or submit your own file for analysis.