RTF malware analysis — malicious · a577ebc8bc1f290b

MALICIOUS

RTF

18.4 KB First seen: 2019-08-04

MD5: 7a78e3bd09feab4d8c48e232157029c6 SHA-1: c78f14ac73924a6d46f64e19770cddb60ea01d6f SHA-256: a577ebc8bc1f290bcc153adf39dba9968b673ce4fda0299ea2236a8027d78095

142 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 objupdate event, strongly indicating an attempt to exploit a vulnerability. The critical RTF_EQUATION_EDITOR heuristic firing points to a known exploit vector targeting Microsoft Equation Editor. This exploit likely facilitates the execution of embedded shellcode, as suggested by the suspicious extracted artifact, which is designed to download and run a secondary 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.
\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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00003f60.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3F60	1316 bytes
SHA-256: `6e235289cd9e74bab11d7a47888eaec82d24cac90f1358587ee0a4bf78eb67ec`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_STR_LOADLIBRARY, SC_STR_URLDOWNLOAD, SC_PEB_ACCESS Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress, URLDownloadToFileW, ExitProcess, ShellExecuteW

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