RTF malware analysis — malicious · c97ed76a8d80a806

MALICIOUS

RTF

46.3 KB First seen: 2019-04-18

MD5: 5d829f3c52f0dab15498bcd2d0f9a7be SHA-1: 6decddeb9a2b850d536705f3e892fc5fecf469be SHA-256: c97ed76a8d80a806bee3ab192b13e7f491fe02c040401874f127758a8f57415b

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, indicating an attempt to activate embedded content. Heuristics specifically flag the Equation Editor as a likely exploit vector, which is commonly used to deliver shellcode. The extracted artifact 'objdata_00_off0000aef0.bin' is a strong indicator of this 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_off0000aef0.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xAEF0	1316 bytes
SHA-256: `75d42088f332347577a3d315bc7e6dccc1ec4e135a07163add10ab4ccde4599b`
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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