RTF malware analysis — malicious · 6c9cb1da43d4b512

MALICIOUS

RTF

280.3 KB Created: 2020-02-12 First seen: 2020-05-25

MD5: 491af3b4a7f6b172aec11756b11f88b0 SHA-1: ce422bcffdf36a9a92033ccbd8d68d8d5d6abf4c SHA-256: 6c9cb1da43d4b512d29a19a5593aa112824a03f81fccd0e94413782cdb724643

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 uses \objupdate to force activation, indicating an attempt to execute embedded code. Heuristics also flag suspicious shellcode API strings and a potential shellcode URL within an extracted artifact. While the specific payload and delivery mechanism are not fully detailed, the presence of these indicators strongly suggests a malicious intent to execute arbitrary code upon opening.

Heuristics 5

Suspicious extracted artifact critical 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.
\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
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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.mic In RTF body
- http://bit.ly/3aeCrwhIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0003a7e9.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x3A7E9	1438 bytes
SHA-256: `2aa80dbe1dc626b9ce2d10890ebf84ef7e54c12543876fc9f7adf9ac7d50b900`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis recovered URL(s): http://bit.ly/3aeCrwh 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: LoadLibraryA, GetProcAddress, URLDownloadToFileA, ExitProcess

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