RTF malware analysis — malicious · f1b0bc2d6ca35d6f

MALICIOUS

RTF

4.1 KB First seen: 2019-03-18

MD5: 51d2b7b1e65c10eab648f5ea858530c5 SHA-1: 07831df482f1a34310fc4f5a092c333eeaff4380 SHA-256: f1b0bc2d6ca35d6fb4369245f64671b1793e7f6fdf8f553c3e581d0dde44c30e

202 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 exploitation of a known vulnerability. The ClamAV detection 'Rtf.Dropper.Agent-7121634-0' and the presence of shellcode API strings in a static triage signal further support this. The file likely acts as a dropper for a secondary payload, as suggested by the OLE object and shellcode indicators.

Heuristics 6

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.
ClamAV: Rtf.Dropper.Agent-7144374-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-7144374-0
\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: `42600c0d69076c9030e45f0470f17c73719d651805422b83a15b524a0406971a`
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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