RTF malware analysis — malicious · 3f657a473761a5d1

MALICIOUS

RTF

2.25 MB Created: 2019-01-03 16:34:00 First seen: 2019-04-18

MD5: 2a003038e2df248ae57d59b5bdb61b22 SHA-1: 35bd2e4c592d277ce731b74ffee5d2393c343f71 SHA-256: 3f657a473761a5d1d597f2c49a002fcbb9f4b182da9e6e92db95913152b4d02d

282 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF file contains multiple OLE objects and excessive hex-encoded data, strongly indicating the presence of embedded shellcode. The critical heuristic firing for CVE-2017-8759 confirms a known exploit for MSXML SAX OLE activation, which is likely used to execute the shellcode. The extracted artifacts, objdata_00_off00002a17.bin and objdata_01_off00220bd6.bin, are the likely locations of this shellcode.

Heuristics 8

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.
CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759

RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
\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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~2111KB of hex-encoded data inside \objdata sections — may hide a payload
Suspicious extracted artifact high 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.
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
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_off00002a17.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x2A17	1055487 bytes
SHA-256: `5e4ad9d7f9b15f63f8c4372c77a008d0d2d392849c9a15c3ed507f80782a3dc4`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: heap spray 0x04, SC_PEB_ACCESS, SC_STR_VIRTUALPROTECT Static shellcode analysis recovered API/import strings: GetProcAddress, VirtualAlloc, VirtualProtect, kernel32.dll, KERNEL32.DLL, LoadLibraryA Carved artifact entropy is 7.64, consistent with packed or encrypted content.
`objdata_01_off00220bd6.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x220BD6	203 bytes
SHA-256: `fd5fc80e6c68e8ffa6f50b5ff55bde057f98ec8a01f313d16bc553677b92d292`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL Static shellcode analysis recovered command string(s): CmD /c %tMp%\A.R

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