RTF malware analysis — malicious · e6a0fbc48420bd36

MALICIOUS

RTF

42.3 KB First seen: 2020-02-04

MD5: ef835b3f839c2e1c582b3d0d885ff6b5 SHA-1: 7a8cfd19ef7d01b5ecf985955935accaa0e400ed SHA-256: e6a0fbc48420bd361f5ffa5e8a37aa4edf439e7713caf21915249210856ac604

142 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 an attempt to exploit a known vulnerability (CVE-2017-11882). The presence of shellcode API strings within the extracted artifact further suggests that the exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The benign URL found is not indicative of malicious activity.

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_off00009ed0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x9ED0	1316 bytes
SHA-256: `2882a86cac7f5930c43f5a36a8188121e98de7d54409f9235f0fb6c41c6716e0`
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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