RTF malware analysis — malicious · 9eaf5fa3e25114a1

MALICIOUS

RTF

4.1 KB First seen: 2019-09-30

MD5: 0b231776b424dd34a16a1fa2dfe4dbbc SHA-1: 469657516fcacc2912ac4e99a605c7c424898f6b SHA-256: 9eaf5fa3e25114a1e13e14422239bbeb27b0baab2ede2cd6b1b96dc2f86c9105

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. The presence of shellcode API strings within the decoded object data further supports this. The file likely serves as a malicious attachment delivered via spearphishing, aiming to execute arbitrary code on the victim's system.

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_off000005e0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x5E0	1316 bytes
SHA-256: `33b658904498e8b6867a1bcfe8238143b526c5f421db9e05662fcbc3232639f3`
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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