RTF malware analysis — malicious · 1dd34c9e89e5ce7a

MALICIOUS

RTF

8.0 KB First seen: 2019-06-27

MD5: ebbb872bd766518f4d83e52a0c7b474e SHA-1: 30e3370a7ee03c51ac77f2ec05e28012aa77007a SHA-256: 1dd34c9e89e5ce7a3740eedf05e74ef9aad1cd6ce7206365f5de78a150aa9398

200 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 suspicious ProgID, indicative of an Equation Editor exploit. The \objupdate directive further suggests an attempt to automatically activate this object. ClamAV identifies the file as Rtf.Dropper.Agent-7126039-0, confirming its malicious nature. The embedded object likely serves as a dropper for a second-stage payload.

Heuristics 5

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.
ClamAV: Rtf.Dropper.Agent-7126039-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-7126039-0
\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_off0000159f.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x159F	1321 bytes
SHA-256: `cbfbc80010e0df707d93da931d188f88d5df71c363377017ec5da7dd20c19658`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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