RTF malware analysis — malicious · fda0157a827cba47

MALICIOUS

RTF

56.3 KB First seen: 2020-01-07

MD5: 179c4f10bda1d4f31c5f77dc79054c23 SHA-1: 3ef79b4dd8a089e33d5b1f3c108de3be37d19412 SHA-256: fda0157a827cba47cf3209b4a2533215b20e62a24b32ae691705e1d55d302a36

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 command, strongly indicating an attempt to exploit the Equation Editor vulnerability (CVE-2017-11882). The heuristic 'EXTRACTED_FILE_STATIC_TRIAGE' further confirms the presence of shellcode, suggesting the primary goal is to execute arbitrary code. This code likely acts as a downloader for a second-stage payload, although the specific payload and delivery mechanism are not detailed in the provided evidence.

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_off0000d6e0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xD6E0	1316 bytes
SHA-256: `c625fdeececc4f7d08dbb2204ebb7bfb609e99807becb8fd1be4e2743f0719a8`
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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