RTF malware analysis — malicious · 1470b6ae5707ec19

MALICIOUS

RTF

35.2 KB First seen: 2019-01-11

MD5: 0bd35f13ae56c5fd0f47f1342bb00e4c SHA-1: e9969310c5da8e44f25251121dd9f8bf46676301 SHA-256: 1470b6ae5707ec190e4936af50c97bf16e7e078f7aad651741e609ff71eaf483

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 suspicious Equation Editor ProgID, indicating exploitation of a known vulnerability (CVE-2017-11882). The \objupdate directive forces the activation of this object, which likely leads to the execution of shellcode found within the objdata section. This shellcode is probably responsible for downloading and executing a secondary payload, a common technique for initial compromise.

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_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	8827 bytes
SHA-256: `ac68720447b7633d1abff9bf2f194015295414dd6bf56e942037ddd84150d0b0`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL Carved artifact entropy is 7.44, consistent with packed or encrypted content.

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