RTF / .DOC malware analysis — malicious · d166ce232dd96e26

MALICIOUS

RTF / .DOC

2.12 MB

MD5: e632f3a85aa5fb027957d0e4b8758bc5 SHA-1: fc176dbc7bfb7407cb9603652215d1b729f4c9b6 SHA-256: d166ce232dd96e2633f4913d3e964dadedf76ff88a7c998edc7cd479defc6a90

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing multiple OLE objects, with specific heuristics indicating the use of the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The ".objupdate" heuristic suggests that the embedded OLE object is designed to be activated automatically. One of the extracted artifacts, objdata_01_off000070c3.bin, contains what appears to be obfuscated VBA code, likely intended to download and execute a secondary payload. The presence of these elements strongly suggests a malicious document designed for exploitation.

Heuristics 5

Split hex Equation Editor ProgID + OLE object critical 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 3 \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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000ad2.bin` `8048aba627fe7d4807d30a0fdee63a5de609bb2b46e208f8bef7a783b0d4da3e`	rtf-objdata-decoded	RTF \objdata at offset 0xAD2	11855 bytes
`objdata_01_off000070c3.bin` `489e0ae96796ec7e1ab092ee5fac4ded0173550df36488d784dd263a8b1118ad`	rtf-objdata-decoded	RTF \objdata at offset 0x70C3	126 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).
`objdata_02_off00007fa7.bin` `63f373ba8f9b56999f95ff0e070697211edb4e0c54354193d91971c2cc1457e5`	rtf-objdata-decoded	RTF \objdata at offset 0x7FA7	465766 bytes

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