RTF malware analysis — malicious · 8805b8874bf3f725

MALICIOUS

RTF

8.1 KB First seen: 2019-05-31

MD5: 03e795d6c0c4b627cae6ff73af32d111 SHA-1: 948d00cf2d0b30f8cb5ccaf679860f2f64ef9149 SHA-256: 8805b8874bf3f72510474643d7fd5a4fda19423ce829413831f40bdaf3634785

240 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and triggers an Equation Editor vulnerability, indicating exploitation for client execution. The presence of shellcode candidates and the ClamAV detection as a dropper suggests it's designed to download and execute a second-stage payload. The file's structure and heuristic firings strongly point to a malicious dropper, likely delivered via spearphishing.

Heuristics 6

Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR

Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM

RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
ClamAV: Doc.Dropper.Agent-6481476-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6481476-0
\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_off0000003c.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3C	4137 bytes
SHA-256: `3c3bd02088e5e28bbfc22872d153318528567aa6b89cf8423981ae4abc48b45a`
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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