RTF malware analysis — malicious · ef07859ddad1d6ef

MALICIOUS

RTF

128.8 KB Created: 2018-12-12 16:35:00 Authoring application: Microsoft Word 11.0.5604 First seen: 2019-01-25

MD5: 1f1fc8c11bac9c8d64f425b4410d8e96 SHA-1: 022d19dc50d0a9f36c65fab0dabd439c560d949b SHA-256: ef07859ddad1d6ef0e775eea126701ebc8cf4ad11fd614a4d7e1c02532c44aad

102 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE objects with ".objupdate" directives, indicating an attempt to activate and execute embedded content. Static triage identified shellcode candidate regions within these objects. This suggests the file is designed to exploit OLE vulnerabilities for client-side execution, likely delivered as a spearphishing attachment.

Heuristics 5

\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 2 \objdata section(s) — embedded OLE objects
Embedded OLE object medium RTF_OBJEMB

RTF contains \objemb — embedded OLE object
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000b758.bin`	rtf-objdata-decoded	RTF \objdata at offset 0xB758	8899 bytes
SHA-256: `4c56eb00213a01c2c8e91cf83b8e7eec7152b51e5879dc114197f0cd017bbb26`
`objdata_01_off0001225b.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x1225B	21300 bytes
SHA-256: `f4f60e0288996edeeaa81f9fc427c32d3674c2d6afdeaab619d96fd279252ada`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL, SC_STR_URLDOWNLOAD Static shellcode analysis recovered API/import strings: LoadLibraryA, GetProcAddress, ExitProcess, URLDownloadToFileA

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