RTF malware analysis — malicious · d5b1c7133100389e

MALICIOUS

RTF

53.4 KB First seen: 2019-05-10

MD5: c7f80224fe3ad455838018cd8d3e32aa SHA-1: dd4d1d3f7c1bbbd06e2a256ace334f0c970c8b39 SHA-256: d5b1c7133100389e7112c2a314ce50da868179cc025fd86c0de7b8943abbf5d7

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 heuristics related to the Equation Editor vulnerability. This indicates an attempt to exploit a known vulnerability for code execution. The embedded artifact 'objdata_00_off0000cb10.bin' is likely the shellcode payload. The presence of ".objupdate" further suggests an attempt to activate the embedded object and trigger the exploit.

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_off0000cb10.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xCB10	1316 bytes
SHA-256: `f024dbab4f32e0fe5439f93ca6dc52098ac3582b574cee226177bd74e515d94d`
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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