RTF / .DOC malware analysis — malicious · f91102e653af8a44

MALICIOUS

RTF / .DOC

1.23 MB First seen: 2023-08-24

MD5: 942602a584fb7fb5880135a2986288bb SHA-1: 58d276d60e7aafdca217b44edeed80cb1abba2af SHA-256: f91102e653af8a44a9c71b55ac44cb148a0ee1bda563a8b1993a3676751d364a

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. This exploit is designed to activate automatically upon opening, likely leading to the execution of a secondary payload hidden within the object data. The large amount of hex-encoded data within the object further suggests the presence of a concealed malicious payload.

Heuristics 6

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.
Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX

RTF contains ~1294KB of hex-encoded data inside \objdata sections — may hide a payload
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
Suspicious extracted artifact info 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off0000008b.bin` `9c4d6d10b771de028aaa4e6d352d7750e654ce950ef6cb603b820f1e835cba10`	rtf-objdata-decoded	RTF \objdata at offset 0x8B	647109 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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